Rivista e Edizione

Volume 66 (2022): Edizione 1 (January 2022)

Volume 65 (2021): Edizione 4 (December 2021)

Volume 65 (2021): Edizione 3 (November 2021)

Volume 65 (2021): Edizione 2 (September 2021)

Volume 65 (2021): Edizione 1 (May 2021)

Volume 64 (2020): Edizione 4 (December 2020)

Volume 64 (2020): Edizione 3 (October 2020)

Volume 64 (2020): Edizione 2 (June 2020)

Volume 64 (2020): Edizione 1 (March 2020)

Volume 63 (2019): Edizione 4 (December 2019)

Volume 63 (2019): Edizione 3 (November 2019)

Volume 63 (2019): Edizione 2 (June 2019)

Volume 63 (2019): Edizione 1 (March 2019)

Volume 62 (2018): Edizione 4 (December 2018)

Volume 62 (2018): Edizione 3 (July 2018)

Volume 62 (2018): Edizione 2 (May 2018)

Volume 62 (2018): Edizione 1 (February 2018)

Volume 61 (2017): Edizione 5 (December 2017)

Volume 61 (2017): Edizione 4 (October 2017)

Volume 61 (2017): Edizione 3 (July 2017)

Volume 61 (2017): Edizione 2 (April 2017)

Volume 61 (2017): Edizione 1 (March 2017)

Volume 60 (2016): Edizione 5 (December 2016)

Volume 60 (2016): Edizione 4 (December 2016)

Volume 60 (2016): Edizione 3 (September 2016)

Volume 60 (2016): Edizione 2 (June 2016)

Volume 60 (2016): Edizione 1 (March 2016)

Volume 59 (2015): Edizione 4 (December 2015)

Volume 59 (2015): Edizione 3 (November 2015)

Volume 59 (2015): Edizione 2 (July 2015)

Volume 59 (2015): Edizione 1 (April 2015)

Volume 58 (2014): Edizione 4 (December 2014)

Volume 58 (2014): Edizione 3 (November 2014)

Volume 58 (2014): Edizione 2 (June 2014)

Volume 58 (2014): Edizione 1 (March 2014)

Volume 57 (2013): Edizione 4 (December 2013)

Volume 57 (2013): Edizione 3 (September 2013)

Volume 57 (2013): Edizione 2 (June 2013)

Volume 57 (2013): Edizione 1 (March 2013)

Volume 56 (2012): Edizione 4 (December 2012)

Volume 56 (2012): Edizione 3 (October 2012)

Volume 56 (2012): Edizione 2 (July 2012)

Volume 56 (2012): Edizione 1 (March 2012)

Dettagli della rivista
Formato
Rivista
eISSN
1804-1213
Pubblicato per la prima volta
03 Apr 2012
Periodo di pubblicazione
4 volte all'anno
Lingue
Inglese

Cerca

Volume 63 (2019): Edizione 2 (June 2019)

Dettagli della rivista
Formato
Rivista
eISSN
1804-1213
Pubblicato per la prima volta
03 Apr 2012
Periodo di pubblicazione
4 volte all'anno
Lingue
Inglese

Cerca

5 Articoli
Accesso libero

Corrosion resistance of AZ31 magnesium alloy treated by plasma electrolytic oxidation

Pubblicato online: 26 Jun 2019
Pagine: 65 - 71

Astratto

Abstract

The coating prepared by plasma electrolytic oxidation (PEO) was created on AZ31 magnesium alloy surface with the aim to evaluate its effect on corrosion resistance. The DC current was applied on the sample in solution consisted of 10 g/l Na3PO4·12H2O and 1 g/l KOH. Additional samples were prepared with 2 and 4 minutes of preparation to observe evolution of the PEO coating. Morphology of the coatings was evaluated by scanning electron microscopy and chemical composition was examined by EDX analysis. Electrochemical characteristic were measured by potentiodynamic polarization tests and electrochemical impedance spectroscopy in 0.1 M NaCl at the laboratory temperature. Obtained data were presented in form of potentiodynamic curves and Nyquist diagrams. Results of analysis showed that plasma electrolytic oxidation coating positively influence corrosion resistance of AZ31 magnesium alloy in chosen corrosive environment.

Accesso libero

Corrosion behaviour of the titanium beta alloy nanotubular surface in the presence of fluoride ions

Pubblicato online: 26 Jun 2019
Pagine: 72 - 78

Astratto

Abstract

The titanium bioactivity could be increased by surface nanostructuring. Titanium alloys are using for dental implants manufacturing. It represents a specific problem because of using of the dental treatments with high concentration of fluoride ions and with acidic pH. The corrosion resistance of nanostructured surface of titanium beta alloy in environments with fluoride ions was examined by common electrochemical technique. The electrochemical impedance measurement showed high corrosion resistance in physiological solution. The fluoride ions have expected negative influence on corrosion behaviour of the layer. The nanotube bottom was preferentially attacked which resulted in layer undercoroding and its detachment.

Accesso libero

Effect of heat treatment on microstructure, microhardness and corrosion resistance of ZE41 Mg alloy

Pubblicato online: 26 Jun 2019
Pagine: 79 - 85

Astratto

Abstract

Magnesium and its alloys are now attracting a great attention as promising materials for several light weight engineering applications. ZE41 is a new Mg alloy contains Zinc, Zirconium and Rare Earth elements as the important alloying elements and is widely used in aerospace applications. In the present study, heat treatment has been carried out at two different temperatures (300 and 335 °C) to assess the effect of heat treatment on microstructure and corrosion behavior of ZE41 Mg alloy. The grain size was observed as almost similar for the unprocessed and heat treated samples. Decreased amount of secondary phase (MgZn2) was observed after heat treating at 300 °C and increased intermetallic phase (Mg7Zn3) and higher number of twins appeared for the samples heat treated at 335 °C. Microhardness measurements showed increased hardness after heat treating at 300 °C and decreased hardness after heat treating at 335 °C which can be attributed to the presence of higher supersaturated grains after heat treating at 300 °C. The samples heat treated at 335 °C exhibited better corrosion resistance compared to those of base materials and samples heat treated at 300 °C. From the results, it can be understood that the selection of heat treatment temperature is crucial that depends on the requirement i.e. to improve the microhardness or at the loss of microhardness to improve the corrosion resistance of ZE41 Mg alloy.

Accesso libero

Properties of coatings created by HVOF technology using micro-and nano-sized powder

Pubblicato online: 26 Jun 2019
Pagine: 86 - 93

Astratto

Abstract

The paper focuses on assessment the resistance of hot-sprayed coatings applied by HVOF technology (WC–Co–Cr created using powder of two different grain sizes) against erosive wear by dry-pot wear test in a pin mill at two sample angles. As these coatings are designated for the environment with varying elevated temperatures and often are in contact with the abrasive, the coatings have been subjected to thermal cyclic loading and their erosive resistance has been determined in as-sprayed condition and after the 5th and 10th thermal cycles. The corrosion resistance of coatings was evaluated by linear polarization (Tafel analysis).

Accesso libero

Self-crosslinking acrylic latexes containing nanoparticles ZnO with increased corrosion and chemical resistance of coating

Pubblicato online: 26 Jun 2019
Pagine: 94 - 99

Astratto

Abstract

The requirements put on coating materials are more and more stringent mainly in the environmental domain, especially as regards VOC emissions. This is why water-based binders as alternatives to solvent-based binders, to provide paints possessing equally good use properties, are intensively sought. The objective of this work was to assess the anticorrosion and chemical properties of paint films based on new self-cross-linking acrylic latexes. The latexes were synthesized via two--step emulsion polymerisation to obtain a core-shell system. Nanostructural ZnO in an amount of 1.5 wt. % was added to the system during the latex binder synthesis. Paints with an enhanced corrosion resistance and chemical resistance of the films were prepared. The binders prepared were pigmented with anticorrosion pigments and their properties were compared to those of commercial water-based dispersions with either identical or different paint film formation mechanisms. The results gave evidence that if a well-selected pigment is used, the binders can be used to obtain anticorrosion coating materials for metallic substrates.

5 Articoli
Accesso libero

Corrosion resistance of AZ31 magnesium alloy treated by plasma electrolytic oxidation

Pubblicato online: 26 Jun 2019
Pagine: 65 - 71

Astratto

Abstract

The coating prepared by plasma electrolytic oxidation (PEO) was created on AZ31 magnesium alloy surface with the aim to evaluate its effect on corrosion resistance. The DC current was applied on the sample in solution consisted of 10 g/l Na3PO4·12H2O and 1 g/l KOH. Additional samples were prepared with 2 and 4 minutes of preparation to observe evolution of the PEO coating. Morphology of the coatings was evaluated by scanning electron microscopy and chemical composition was examined by EDX analysis. Electrochemical characteristic were measured by potentiodynamic polarization tests and electrochemical impedance spectroscopy in 0.1 M NaCl at the laboratory temperature. Obtained data were presented in form of potentiodynamic curves and Nyquist diagrams. Results of analysis showed that plasma electrolytic oxidation coating positively influence corrosion resistance of AZ31 magnesium alloy in chosen corrosive environment.

Accesso libero

Corrosion behaviour of the titanium beta alloy nanotubular surface in the presence of fluoride ions

Pubblicato online: 26 Jun 2019
Pagine: 72 - 78

Astratto

Abstract

The titanium bioactivity could be increased by surface nanostructuring. Titanium alloys are using for dental implants manufacturing. It represents a specific problem because of using of the dental treatments with high concentration of fluoride ions and with acidic pH. The corrosion resistance of nanostructured surface of titanium beta alloy in environments with fluoride ions was examined by common electrochemical technique. The electrochemical impedance measurement showed high corrosion resistance in physiological solution. The fluoride ions have expected negative influence on corrosion behaviour of the layer. The nanotube bottom was preferentially attacked which resulted in layer undercoroding and its detachment.

Accesso libero

Effect of heat treatment on microstructure, microhardness and corrosion resistance of ZE41 Mg alloy

Pubblicato online: 26 Jun 2019
Pagine: 79 - 85

Astratto

Abstract

Magnesium and its alloys are now attracting a great attention as promising materials for several light weight engineering applications. ZE41 is a new Mg alloy contains Zinc, Zirconium and Rare Earth elements as the important alloying elements and is widely used in aerospace applications. In the present study, heat treatment has been carried out at two different temperatures (300 and 335 °C) to assess the effect of heat treatment on microstructure and corrosion behavior of ZE41 Mg alloy. The grain size was observed as almost similar for the unprocessed and heat treated samples. Decreased amount of secondary phase (MgZn2) was observed after heat treating at 300 °C and increased intermetallic phase (Mg7Zn3) and higher number of twins appeared for the samples heat treated at 335 °C. Microhardness measurements showed increased hardness after heat treating at 300 °C and decreased hardness after heat treating at 335 °C which can be attributed to the presence of higher supersaturated grains after heat treating at 300 °C. The samples heat treated at 335 °C exhibited better corrosion resistance compared to those of base materials and samples heat treated at 300 °C. From the results, it can be understood that the selection of heat treatment temperature is crucial that depends on the requirement i.e. to improve the microhardness or at the loss of microhardness to improve the corrosion resistance of ZE41 Mg alloy.

Accesso libero

Properties of coatings created by HVOF technology using micro-and nano-sized powder

Pubblicato online: 26 Jun 2019
Pagine: 86 - 93

Astratto

Abstract

The paper focuses on assessment the resistance of hot-sprayed coatings applied by HVOF technology (WC–Co–Cr created using powder of two different grain sizes) against erosive wear by dry-pot wear test in a pin mill at two sample angles. As these coatings are designated for the environment with varying elevated temperatures and often are in contact with the abrasive, the coatings have been subjected to thermal cyclic loading and their erosive resistance has been determined in as-sprayed condition and after the 5th and 10th thermal cycles. The corrosion resistance of coatings was evaluated by linear polarization (Tafel analysis).

Accesso libero

Self-crosslinking acrylic latexes containing nanoparticles ZnO with increased corrosion and chemical resistance of coating

Pubblicato online: 26 Jun 2019
Pagine: 94 - 99

Astratto

Abstract

The requirements put on coating materials are more and more stringent mainly in the environmental domain, especially as regards VOC emissions. This is why water-based binders as alternatives to solvent-based binders, to provide paints possessing equally good use properties, are intensively sought. The objective of this work was to assess the anticorrosion and chemical properties of paint films based on new self-cross-linking acrylic latexes. The latexes were synthesized via two--step emulsion polymerisation to obtain a core-shell system. Nanostructural ZnO in an amount of 1.5 wt. % was added to the system during the latex binder synthesis. Paints with an enhanced corrosion resistance and chemical resistance of the films were prepared. The binders prepared were pigmented with anticorrosion pigments and their properties were compared to those of commercial water-based dispersions with either identical or different paint film formation mechanisms. The results gave evidence that if a well-selected pigment is used, the binders can be used to obtain anticorrosion coating materials for metallic substrates.

Pianifica la tua conferenza remota con Sciendo