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Tom 66 (2022): Zeszyt 1 (January 2022)

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Tom 61 (2017): Zeszyt 2 (April 2017)

Tom 61 (2017): Zeszyt 1 (March 2017)

Tom 60 (2016): Zeszyt 5 (December 2016)

Tom 60 (2016): Zeszyt 4 (December 2016)

Tom 60 (2016): Zeszyt 3 (September 2016)

Tom 60 (2016): Zeszyt 2 (June 2016)

Tom 60 (2016): Zeszyt 1 (March 2016)

Tom 59 (2015): Zeszyt 4 (December 2015)

Tom 59 (2015): Zeszyt 3 (November 2015)

Tom 59 (2015): Zeszyt 2 (July 2015)

Tom 59 (2015): Zeszyt 1 (April 2015)

Tom 58 (2014): Zeszyt 4 (December 2014)

Tom 58 (2014): Zeszyt 3 (November 2014)

Tom 58 (2014): Zeszyt 2 (June 2014)

Tom 58 (2014): Zeszyt 1 (March 2014)

Tom 57 (2013): Zeszyt 4 (December 2013)

Tom 57 (2013): Zeszyt 3 (September 2013)

Tom 57 (2013): Zeszyt 2 (June 2013)

Tom 57 (2013): Zeszyt 1 (March 2013)

Tom 56 (2012): Zeszyt 4 (December 2012)

Tom 56 (2012): Zeszyt 3 (October 2012)

Tom 56 (2012): Zeszyt 2 (July 2012)

Tom 56 (2012): Zeszyt 1 (March 2012)

Informacje o czasopiśmie
Format
Czasopismo
eISSN
1804-1213
Pierwsze wydanie
03 Apr 2012
Częstotliwość wydawania
4 razy w roku
Języki
Angielski

Wyszukiwanie

Tom 66 (2022): Zeszyt 1 (January 2022)

Informacje o czasopiśmie
Format
Czasopismo
eISSN
1804-1213
Pierwsze wydanie
03 Apr 2012
Częstotliwość wydawania
4 razy w roku
Języki
Angielski

Wyszukiwanie

12 Artykułów
access type Otwarty dostęp

Growth kinetics of diiron boride (Fe2B) layer on a carbon steel by four approaches

Data publikacji: 18 Apr 2022
Zakres stron: 1 - 6

Abstrakt

Abstract

The pack-boriding kinetics of SAE 1020 steel has been addressed through utilizing four mathematical approaches in case of the formation of diiron boride layers. The values of boron diffusivities and activation energies in Fe2B were assessed in the interval of 1123 to 1223 K by using four models. Finally, the four models were experimentally verified by comparing the predicted results to the experimental value of Fe2B layer thickness determined at 1198 K for 6 hours. Finally, the simulated layers’ thicknesses agreed with the experimental result. In addition, similarities and differences observed in the models were also discussed.

access type Otwarty dostęp

Experimental studies on the corrosion inhibition of mild steel by 1-(phenylamino-1,3,4-thiadiazol-5-yl)-3-phenyl-3-oxopropan complemented with DFT Modeling

Data publikacji: 18 Apr 2022
Zakres stron: 7 - 15

Abstrakt

Abstract

1-(Phenylamino-1,3,4-thiadiazol-5-yl)-3-phenyl-3-oxopropan (PTPO) was selected as the investigated material for studying the protection performance for mild steel in 1 mol L-1 hydrochloric acid solution. The inhibitor was assessed using weight loss measurements complemented with morphological analytical techniques and density functional theory (DFT) modelling. The PTPO demonstrated significant inhibitive efficacy of 95.4% in the presence of 500 ppm at 303 K. The protection efficiency increases with the concentration increasing from 100 to 500 ppm, and no significant effect after 500 ppm. Furthermore, gravimetric findings reveal that the protection efficiency at 500 ppm PTPO increases with immersion period and increasing temperature (303-333 K), due to the effective adsorption of PTPO on the mild steel surface, and the protection efficiency value is 95.8% at 48 h of exposure and 95.4%, 95.4%, 95.7% and 95.9% at 303, 313, 323 and 333 K, respectively. The adsorption of PTPO on the mild steel surface obeyed the Langmuir adsorption isotherm model and revealing the mode of chemisorption adsorption. According to the DFT calculations, protection by PTPO is essentially performed by the heteroatoms in the inhibitor molecules which represented the adsorption sites, and the aromatic rings increase the electrostatic interaction between the PTPO molecules and the mild steel surface. The surface morphological studies, weight loss measurements, and DFT computational studies are in good agreement and that the selected corrosion inhibitor is adsorbed on the mild steel surface to form a protected layer on the surface of mild steel against the hydrochloric acid solution.

access type Otwarty dostęp

Dissimilar weld joint corrosion in simulated boiler water environment

Data publikacji: 18 Apr 2022
Zakres stron: 16 - 19

Abstrakt

Abstract

This paper is focused on the problematics of weld joint corrosive degradation in the boiler water environment. The boiler water is commonly used in power industry. The corrosion experiment simulated the boiler water environment during shutdown, when chemicals may be concentrated in the deposits, or as a result of evaporation. The corrosion experiment was performed on heterogeneous weldments made of P265GH//X6CrNiTi18-9 steels in the environment of stagnant boiler water with the addition of NaCl for 53 days. The data showed only minimal weight losses, and small changes in the measured fracture toughness of the welded joint. At the same time, a tendency for a mechanical weakening of the welded joint with the increasing aggressivity of the boiler water environment was observed. The metallographic analysis was performed to describe the nature of corrosive degradation.

access type Otwarty dostęp

Resistance of the welded joint of austenitic steel NEUTRONIT A 976 SM in the corrosive environment of boric acid

Data publikacji: 18 Apr 2022
Zakres stron: 20 - 24

Abstrakt

Abstract

The paper deals with the influence of the operating environment on the safe resistance of the welded joint of the construction material used in the nuclear power industry in the production of spent nuclear fuel containers. This material contains a higher percentage of alloying boron and is used as a shielding construction material for neutron and gamma radiation. It is used to produce baskets for spent nuclear fuel containers. When the containers are being filled, the welded joint of the basket structure are briefly exposed to an aqueous boric acid solution. The aim of this work was to determine the effects of exposure to the corrosive boric acid environment on the mechanical properties of the material. Tensile tests on the original weld and post weld exposure in H3BO3 and corrosion cracking tests on unexposed welds were performed. The evaluation of the results revealed that the exposure to the corrosive environment of boric acid did not significantly affect the strength characteristics of the tested material NEUTRONIT A 976 SM.

access type Otwarty dostęp

Impact of the diffusion coefficient calculation on predicting Fe2B boride layer thickness

Data publikacji: 18 Apr 2022
Zakres stron: 25 - 35

Abstrakt

Abstract

In this study, a single-phase boride layer thickness Fe2B is predicted on two different substrates (Armco iron and XC38 steel) by following the integral method. This method is a mathematical model based on a system of differential algebraic equations that help to deduce the diffusion coefficient, which is the key factor on predicting the layer thickness. Literatures cover different diffusion coefficients for each substrate, albeit researchers usually extract from experimental data, variations of growth rate constants within only one time treatment and deduce the diffusion coefficient from them. This deduction is done via an estimation of a frequency factor and an activation energy from the growth rate constants. Therefore, our main aim is to illustrate the impact of the deduction of the diffusion coefficient on predicting the boride layer thickness. Lastly, the impact with and without incubation time on the boriding kinetics of both substrates was also examined.

access type Otwarty dostęp

Innovative accident tolerant nuclear fuel materials will help extending the life of light water reactors

Data publikacji: 18 Apr 2022
Zakres stron: 36 - 39

Abstrakt

Abstract

Nuclear power is a significant source of clean energy that can be used to mitigate climate change. In the western world, the average life of light-water power-reactors is increasing because no new reactors are being connected to the grid. In order to extend the life of the existing reactors innovative materials are being considered for the fuel of the reactors. The newer materials would be more resistant to a loss of coolant accident and allow for longer times between refueling plus permitting overall extended burn-ups, which will make the reactors safer and more economical to operate. This never used before in reactor materials include cladding concepts such as: 1) coated zirconium alloys, 2) monolithic iron-chromium-aluminum alloys, and 3) silicon carbide composites.

access type Otwarty dostęp

Prediction models for the kinetics of iron boride layers on AISI 316L steel

Data publikacji: 18 Apr 2022
Zakres stron: 40 - 49

Abstrakt

Abstract

The boronizing kinetics of AISI 316L steel has been analyzed by employing five prediction models. The boron diffusion coefficients as well as the growth rate constants in the FeB and Fe2B phases were firstly evaluated in the range of 1123-1223 K. Afterwards, the values of boron activation energies in FeB and Fe2B were secondly deduced by adopting the Arrhenius relationships.In addition, the prediction models have been validated experimentally for two boronizing conditions (1170 K for 1.6 h and 1210 K for 1.1 h). The predicted results were deemed very concordant with the experiments. Furthermore, advantages and limitations about the applicability of these models were also discussed.

access type Otwarty dostęp

Corrosion assessment of a bronze equestrian statue exposed to urban environment

Data publikacji: 18 Apr 2022
Zakres stron: 50 - 55

Abstrakt

Abstract

This paper presents the characterization of the conservation state of a bronze equestrian statue exposed outdoor, through an in-situ, multi-analytical, and non-invasive approach. The artefact under study is a bronze equestrian statue, devoted to Alfonso La Marmora, placed in an urban environment in the city of Turin. The investigation was carried out in the framework of a restoration intervention, with the principal aim of characterizing the overall conservation state of the sculpture to provide the conservators with information useful to develop a tailored restoration plan. X-ray fluorescence spectroscopy (XRF) was carried out for the identification of the elements present in the artefact alloy, showing that the statue was made using mainly two bronze alloys. Electrochemical Impedance Spectroscopy (EIS) was performed to study the corrosion mechanisms and to define the protective effectiveness of the patina present on the surfaces. Eventually, Raman spectroscopy (RS) was performed to characterize the chemistry and microstructure of the corrosion products, mainly identified as sulphates. The combination of these techniques allowed to confirm the presence of wax layers from previous restoration work, still capable to protect the metal substrate against corrosion. In addition, it was possible to correlate the conservation state to the exposure conditions and location on the statue.

access type Otwarty dostęp

Experimental assessment of packaging paper properties effect in combination with storage conditions on the adhesion performance of automotive glass

Data publikacji: 07 Jul 2022
Zakres stron: 56 - 66

Abstrakt

Abstract

The aim of this work was an experimental comparison of different types of packaging paper, determining the effect of packaging material properties in combination with storage conditions on the purity of glass surface and the related quality of adhesion of bonded materials. In the automotive industry, the quality of adhesion is a key factor, as automotive glass must meet the safety requirements. During the experiments, the glass sheets were wrapped in four types of paper and stored according to the conditions that are common in a real production. The research was focused on the influence of different composition of packaging papers on the resulting adhesive properties of glass sheets. According to the results obtained in this work, it can be stated that during the storage there is an interaction between paper and glass. According to XRF analyzes, ongoing corrosion of the glass can be inferred. The resulting adhesion was assessed based on a peel test, which took place under defined conditions given by standard customer specifications. It has been observed that the negative effect of unsuitable paper increases over time. For optimal adhesion it is necessary to emphasize the packaging materials and the storage conditions of the glass. The results and knowledge achieved in this work can significantly improve the quality of production in which a material is glued to the glass surface.

access type Otwarty dostęp

Metal Antik conservation coatings on iron specimens

Data publikacji: 07 Jul 2022
Zakres stron: 67 - 71

Abstrakt

Abstract

The surface treatment of historical iron artefacts involves application of right conservation coating to the material to prevent further corrosion deterioration. Among common conservation agent of iron belong tannate coating, which is considerably preferred with the desired black appearance of the surface. In this work the new potentional conservation agent Metal Antik was studied. The change of this possible surface treatment was evaluated over time. The comparison between long-term exposed samples (15 years), short-term exposed samples (1.5 year) and fresh cured samples was done by spectrocolorimetry measurement. This was also compared to standard samples prepared with tannate coating. Surface analysis for all types of samples was done by μ-Raman spectroscopy. Results proved that effect of time changes the surface of coatings. It was demonstrated by colour change of surface and by formation of areas with local corrosion. Another study of Metal Antik in order to improve corrosion resistance is open.

access type Otwarty dostęp

Defects on silver based coatings

Data publikacji: 07 Jul 2022
Zakres stron: 72 - 80

Abstrakt

Abstract

New trends in the automotive and construction industries are leading manufacturers to develop new materials with added value. In this article, we deal with the introduction of such a material, namely a silver-based emission coating, which is used in both architecture and the automotive industry. Silver-based coating thus makes it possible to increase the driver’s comfort, or to increase the comfort of working in the office on hot steamy days. This coating changes the transmittance of IR radiation from or to the building, or from or to the car. The coating is based primarily on the presence of layers of silver, which are able to provide the primary functions of modulation of incoming and outgoing radiation. Silver-based coatings can also be used to heat, for example, car windshields. The production of a silver-based coating is very demanding and sensitive to the formation of coating defects. In this article, we discuss common coating defects and discuss their possible origins.

access type Otwarty dostęp

Corrosion and tribological behaviour of Friction Stir Processed AA2024-T351 alloy

Data publikacji: 07 Jul 2022
Zakres stron: 81 - 95

Abstrakt

Abstract

AA2024-T351, a heat treatable aluminum alloy, has a high strength to weight ratio and good fracture resistance and has application mainly in the aircraft and aerospace sector. However, the alloy is susceptible to high corrosion because of the secondary phases (Al2Cu) present in the matrix. With an objective to increase the corrosion and wear resistance, Friction Stir Processing is applied to engineer the morphology and dispersion of the Al2Cu phase in the alloy. The friction stir processing trials are performed by varying the tool rotation speed, tool traverse speed, and shoulder diameter, as the properties of the friction stir processed region depend on the proper selection of process parameters. A hybrid linear-radial basis function model is developed to explore the effect of tool rotation speed, tool traverse speed, and shoulder diameter on the grain size, microhardness, corrosion rate, wear rate, and corrosion potential of the friction stir processed AA2024-T351 alloy. The predominant corrosion mechanism and wear regimes in AA2024-T351 alloy are understood from the characterization study on the surface morphology and elemental analysis of the corroded and worn specimens. The optimum friction stir processing parameters that improve the grain refinement, microhardness, corrosion resistance and wear resistance of AA2024-T351 alloy are established.

12 Artykułów
access type Otwarty dostęp

Growth kinetics of diiron boride (Fe2B) layer on a carbon steel by four approaches

Data publikacji: 18 Apr 2022
Zakres stron: 1 - 6

Abstrakt

Abstract

The pack-boriding kinetics of SAE 1020 steel has been addressed through utilizing four mathematical approaches in case of the formation of diiron boride layers. The values of boron diffusivities and activation energies in Fe2B were assessed in the interval of 1123 to 1223 K by using four models. Finally, the four models were experimentally verified by comparing the predicted results to the experimental value of Fe2B layer thickness determined at 1198 K for 6 hours. Finally, the simulated layers’ thicknesses agreed with the experimental result. In addition, similarities and differences observed in the models were also discussed.

access type Otwarty dostęp

Experimental studies on the corrosion inhibition of mild steel by 1-(phenylamino-1,3,4-thiadiazol-5-yl)-3-phenyl-3-oxopropan complemented with DFT Modeling

Data publikacji: 18 Apr 2022
Zakres stron: 7 - 15

Abstrakt

Abstract

1-(Phenylamino-1,3,4-thiadiazol-5-yl)-3-phenyl-3-oxopropan (PTPO) was selected as the investigated material for studying the protection performance for mild steel in 1 mol L-1 hydrochloric acid solution. The inhibitor was assessed using weight loss measurements complemented with morphological analytical techniques and density functional theory (DFT) modelling. The PTPO demonstrated significant inhibitive efficacy of 95.4% in the presence of 500 ppm at 303 K. The protection efficiency increases with the concentration increasing from 100 to 500 ppm, and no significant effect after 500 ppm. Furthermore, gravimetric findings reveal that the protection efficiency at 500 ppm PTPO increases with immersion period and increasing temperature (303-333 K), due to the effective adsorption of PTPO on the mild steel surface, and the protection efficiency value is 95.8% at 48 h of exposure and 95.4%, 95.4%, 95.7% and 95.9% at 303, 313, 323 and 333 K, respectively. The adsorption of PTPO on the mild steel surface obeyed the Langmuir adsorption isotherm model and revealing the mode of chemisorption adsorption. According to the DFT calculations, protection by PTPO is essentially performed by the heteroatoms in the inhibitor molecules which represented the adsorption sites, and the aromatic rings increase the electrostatic interaction between the PTPO molecules and the mild steel surface. The surface morphological studies, weight loss measurements, and DFT computational studies are in good agreement and that the selected corrosion inhibitor is adsorbed on the mild steel surface to form a protected layer on the surface of mild steel against the hydrochloric acid solution.

access type Otwarty dostęp

Dissimilar weld joint corrosion in simulated boiler water environment

Data publikacji: 18 Apr 2022
Zakres stron: 16 - 19

Abstrakt

Abstract

This paper is focused on the problematics of weld joint corrosive degradation in the boiler water environment. The boiler water is commonly used in power industry. The corrosion experiment simulated the boiler water environment during shutdown, when chemicals may be concentrated in the deposits, or as a result of evaporation. The corrosion experiment was performed on heterogeneous weldments made of P265GH//X6CrNiTi18-9 steels in the environment of stagnant boiler water with the addition of NaCl for 53 days. The data showed only minimal weight losses, and small changes in the measured fracture toughness of the welded joint. At the same time, a tendency for a mechanical weakening of the welded joint with the increasing aggressivity of the boiler water environment was observed. The metallographic analysis was performed to describe the nature of corrosive degradation.

access type Otwarty dostęp

Resistance of the welded joint of austenitic steel NEUTRONIT A 976 SM in the corrosive environment of boric acid

Data publikacji: 18 Apr 2022
Zakres stron: 20 - 24

Abstrakt

Abstract

The paper deals with the influence of the operating environment on the safe resistance of the welded joint of the construction material used in the nuclear power industry in the production of spent nuclear fuel containers. This material contains a higher percentage of alloying boron and is used as a shielding construction material for neutron and gamma radiation. It is used to produce baskets for spent nuclear fuel containers. When the containers are being filled, the welded joint of the basket structure are briefly exposed to an aqueous boric acid solution. The aim of this work was to determine the effects of exposure to the corrosive boric acid environment on the mechanical properties of the material. Tensile tests on the original weld and post weld exposure in H3BO3 and corrosion cracking tests on unexposed welds were performed. The evaluation of the results revealed that the exposure to the corrosive environment of boric acid did not significantly affect the strength characteristics of the tested material NEUTRONIT A 976 SM.

access type Otwarty dostęp

Impact of the diffusion coefficient calculation on predicting Fe2B boride layer thickness

Data publikacji: 18 Apr 2022
Zakres stron: 25 - 35

Abstrakt

Abstract

In this study, a single-phase boride layer thickness Fe2B is predicted on two different substrates (Armco iron and XC38 steel) by following the integral method. This method is a mathematical model based on a system of differential algebraic equations that help to deduce the diffusion coefficient, which is the key factor on predicting the layer thickness. Literatures cover different diffusion coefficients for each substrate, albeit researchers usually extract from experimental data, variations of growth rate constants within only one time treatment and deduce the diffusion coefficient from them. This deduction is done via an estimation of a frequency factor and an activation energy from the growth rate constants. Therefore, our main aim is to illustrate the impact of the deduction of the diffusion coefficient on predicting the boride layer thickness. Lastly, the impact with and without incubation time on the boriding kinetics of both substrates was also examined.

access type Otwarty dostęp

Innovative accident tolerant nuclear fuel materials will help extending the life of light water reactors

Data publikacji: 18 Apr 2022
Zakres stron: 36 - 39

Abstrakt

Abstract

Nuclear power is a significant source of clean energy that can be used to mitigate climate change. In the western world, the average life of light-water power-reactors is increasing because no new reactors are being connected to the grid. In order to extend the life of the existing reactors innovative materials are being considered for the fuel of the reactors. The newer materials would be more resistant to a loss of coolant accident and allow for longer times between refueling plus permitting overall extended burn-ups, which will make the reactors safer and more economical to operate. This never used before in reactor materials include cladding concepts such as: 1) coated zirconium alloys, 2) monolithic iron-chromium-aluminum alloys, and 3) silicon carbide composites.

access type Otwarty dostęp

Prediction models for the kinetics of iron boride layers on AISI 316L steel

Data publikacji: 18 Apr 2022
Zakres stron: 40 - 49

Abstrakt

Abstract

The boronizing kinetics of AISI 316L steel has been analyzed by employing five prediction models. The boron diffusion coefficients as well as the growth rate constants in the FeB and Fe2B phases were firstly evaluated in the range of 1123-1223 K. Afterwards, the values of boron activation energies in FeB and Fe2B were secondly deduced by adopting the Arrhenius relationships.In addition, the prediction models have been validated experimentally for two boronizing conditions (1170 K for 1.6 h and 1210 K for 1.1 h). The predicted results were deemed very concordant with the experiments. Furthermore, advantages and limitations about the applicability of these models were also discussed.

access type Otwarty dostęp

Corrosion assessment of a bronze equestrian statue exposed to urban environment

Data publikacji: 18 Apr 2022
Zakres stron: 50 - 55

Abstrakt

Abstract

This paper presents the characterization of the conservation state of a bronze equestrian statue exposed outdoor, through an in-situ, multi-analytical, and non-invasive approach. The artefact under study is a bronze equestrian statue, devoted to Alfonso La Marmora, placed in an urban environment in the city of Turin. The investigation was carried out in the framework of a restoration intervention, with the principal aim of characterizing the overall conservation state of the sculpture to provide the conservators with information useful to develop a tailored restoration plan. X-ray fluorescence spectroscopy (XRF) was carried out for the identification of the elements present in the artefact alloy, showing that the statue was made using mainly two bronze alloys. Electrochemical Impedance Spectroscopy (EIS) was performed to study the corrosion mechanisms and to define the protective effectiveness of the patina present on the surfaces. Eventually, Raman spectroscopy (RS) was performed to characterize the chemistry and microstructure of the corrosion products, mainly identified as sulphates. The combination of these techniques allowed to confirm the presence of wax layers from previous restoration work, still capable to protect the metal substrate against corrosion. In addition, it was possible to correlate the conservation state to the exposure conditions and location on the statue.

access type Otwarty dostęp

Experimental assessment of packaging paper properties effect in combination with storage conditions on the adhesion performance of automotive glass

Data publikacji: 07 Jul 2022
Zakres stron: 56 - 66

Abstrakt

Abstract

The aim of this work was an experimental comparison of different types of packaging paper, determining the effect of packaging material properties in combination with storage conditions on the purity of glass surface and the related quality of adhesion of bonded materials. In the automotive industry, the quality of adhesion is a key factor, as automotive glass must meet the safety requirements. During the experiments, the glass sheets were wrapped in four types of paper and stored according to the conditions that are common in a real production. The research was focused on the influence of different composition of packaging papers on the resulting adhesive properties of glass sheets. According to the results obtained in this work, it can be stated that during the storage there is an interaction between paper and glass. According to XRF analyzes, ongoing corrosion of the glass can be inferred. The resulting adhesion was assessed based on a peel test, which took place under defined conditions given by standard customer specifications. It has been observed that the negative effect of unsuitable paper increases over time. For optimal adhesion it is necessary to emphasize the packaging materials and the storage conditions of the glass. The results and knowledge achieved in this work can significantly improve the quality of production in which a material is glued to the glass surface.

access type Otwarty dostęp

Metal Antik conservation coatings on iron specimens

Data publikacji: 07 Jul 2022
Zakres stron: 67 - 71

Abstrakt

Abstract

The surface treatment of historical iron artefacts involves application of right conservation coating to the material to prevent further corrosion deterioration. Among common conservation agent of iron belong tannate coating, which is considerably preferred with the desired black appearance of the surface. In this work the new potentional conservation agent Metal Antik was studied. The change of this possible surface treatment was evaluated over time. The comparison between long-term exposed samples (15 years), short-term exposed samples (1.5 year) and fresh cured samples was done by spectrocolorimetry measurement. This was also compared to standard samples prepared with tannate coating. Surface analysis for all types of samples was done by μ-Raman spectroscopy. Results proved that effect of time changes the surface of coatings. It was demonstrated by colour change of surface and by formation of areas with local corrosion. Another study of Metal Antik in order to improve corrosion resistance is open.

access type Otwarty dostęp

Defects on silver based coatings

Data publikacji: 07 Jul 2022
Zakres stron: 72 - 80

Abstrakt

Abstract

New trends in the automotive and construction industries are leading manufacturers to develop new materials with added value. In this article, we deal with the introduction of such a material, namely a silver-based emission coating, which is used in both architecture and the automotive industry. Silver-based coating thus makes it possible to increase the driver’s comfort, or to increase the comfort of working in the office on hot steamy days. This coating changes the transmittance of IR radiation from or to the building, or from or to the car. The coating is based primarily on the presence of layers of silver, which are able to provide the primary functions of modulation of incoming and outgoing radiation. Silver-based coatings can also be used to heat, for example, car windshields. The production of a silver-based coating is very demanding and sensitive to the formation of coating defects. In this article, we discuss common coating defects and discuss their possible origins.

access type Otwarty dostęp

Corrosion and tribological behaviour of Friction Stir Processed AA2024-T351 alloy

Data publikacji: 07 Jul 2022
Zakres stron: 81 - 95

Abstrakt

Abstract

AA2024-T351, a heat treatable aluminum alloy, has a high strength to weight ratio and good fracture resistance and has application mainly in the aircraft and aerospace sector. However, the alloy is susceptible to high corrosion because of the secondary phases (Al2Cu) present in the matrix. With an objective to increase the corrosion and wear resistance, Friction Stir Processing is applied to engineer the morphology and dispersion of the Al2Cu phase in the alloy. The friction stir processing trials are performed by varying the tool rotation speed, tool traverse speed, and shoulder diameter, as the properties of the friction stir processed region depend on the proper selection of process parameters. A hybrid linear-radial basis function model is developed to explore the effect of tool rotation speed, tool traverse speed, and shoulder diameter on the grain size, microhardness, corrosion rate, wear rate, and corrosion potential of the friction stir processed AA2024-T351 alloy. The predominant corrosion mechanism and wear regimes in AA2024-T351 alloy are understood from the characterization study on the surface morphology and elemental analysis of the corroded and worn specimens. The optimum friction stir processing parameters that improve the grain refinement, microhardness, corrosion resistance and wear resistance of AA2024-T351 alloy are established.

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