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Détails du magazine
Format
Magazine
eISSN
1804-1213
Première publication
03 Apr 2012
Période de publication
4 fois par an
Langues
Anglais

Chercher

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

Détails du magazine
Format
Magazine
eISSN
1804-1213
Première publication
03 Apr 2012
Période de publication
4 fois par an
Langues
Anglais

Chercher

5 Articles
Accès libre

The study on corrosion of Pb–Sn–Sb alloys in soil

Publié en ligne: 22 Apr 2015
Pages: 1 - 6

Résumé

Abstract

The paper studies corrosion of selected Pb-Sn-Sb alloys in soil. Corrosion tests were proposed and performed based on the survey of the mechanism of corrosion of archaeological objects – letter types. The composition of tested lead alloys corresponds to the phases in structures of alloys the original types were made from. Three types of soil with different pH were selected as the corrosion environment and one of the set of specimens was exposed additionally to acetic acid vapours to monitor the impact of volatile organic compounds. The results were compared with similar corrosion tests performed at the University of Antwerp. The results implied that it was predominantly the character of the microstructure the lead alloys form that affects corrosion of Pb–Sn–Sb alloys. Intermetallic phases SnSb are formed within the lead matrix, the average composition of which corresponds to 55 % of Sn and 45 % of Sb. The SnSb phase is very hard and resistant; a corrosion microcell is formed when in contact with the matrix, with the lead matrix being preferentially susceptible to corrosion. The content of antimony and tin in the alloy affects formation and the quantity of the SnSb phase.

Accès libre

Program of experimental atmospheric corrosion tests of weathering steels

Publié en ligne: 22 Apr 2015
Pages: 7 - 18

Résumé

Abstract

This article presents the program of experimental atmospheric corrosion test of weathering steels. This program is designed as a long-term project. Attention is paid to study of corrosion processes at different structural elements of supporting structures of bridges. Measurements of corrosion losses and average thicknesses of corrosion products are carried out within this experimental program. Protective ability of corrosion products is evaluated using X-ray diffraction analysis. The article presents results of corrosion tests after one year of exposure of corrosion specimens. It results from the tests that corrosion losses of weathering steels are signifi cantly conditioned by position and location of exposed surface within the structure.

Accès libre

Ex-situ characterization of pre- and post-transient specimens of Zr1Nb alloys

Publié en ligne: 22 Apr 2015
Pages: 19 - 23

Résumé

Abstract

The ex-situ tests were performed with Zr1Nb alloy specimens that had been pre-exposed to the environment with an elevated concentration of lithium (70 ppm Li as LiOH) at the temperature of 360 °C for a period of 63 to 77 days prior to the measurement. The impedance changes at the phase alloy- -oxide-electrolyte interface were monitored using the ex-situ electrochemical impedance spectroscopy. At the same time, the progress of electrolyte penetration in the oxide porous structure was studied. The oxidic layer and the electrolyte penetration are characterized by the elements of the equivalent circuit model and Jonscher analysis that enables calculation of the dielectric thickness of the oxide.

Accès libre

Flexible binders, their degradation and impact on cement substrate

Publié en ligne: 22 Apr 2015
Pages: 24 - 29

Résumé

Abstract

Compared to the traditional inorganic binders based on mortar or plaster, cementing clefts and cracks with polymer fl exible binders is effective in terms of better adhesion and fl exibility. Nevertheless, in order to be applicable in restoration practice they must comply with the condition of a minimum impact on the substrate, which frequently is a porous material. Silicon-based binders, synthetic rubber and hybrid binders based on silicone modifi ed with polyurethane and polyether were tested in this study. The binders were artifi cially aged under various conditions. At the same time, the study also focused on the extent of infl uencing of the porous cement substrate by the application of binders. The silicone binders showed the best resistance to artifi cial aging, however, the originally hydrophilic substrate became hydrophobic. Hybrid binders showed better resistance to moist rather than dry atmosphere. Testing in the QUV panel caused cracking and incoherence of all hybrid bonders. Various categories of binders showed similar properties in terms of resistance to aging and the extent of infl uencing of the porous substrate. The porous cement substrate was reported to be substantially infl uenced by all tested binders. Therefore, none of the tested binders can be unambiguously recommended for application in restoration practice.

Accès libre

Selected types of corrosion degradation of pipelines

Publié en ligne: 22 Apr 2015
Pages: 30 - 36

Résumé

Abstract

The paper deals with corrosion degradation of gas pipeline. Pipelines play very important role as means transporting gas media over long distances from producers to end-users. Gas pipelines present a risk of potential corrosion degradation that can result in their failure. Corrosion on internal surfaces of steel pipes takes place in CO2, H2S, H2O and chloride environment. Degradation of steel results in loss of mechanical properties, reduction in thickness and ultimate perforation and failure. Corrosion is the electrochemical process that involves the fl ow of electrical currents on a micro or macro scale. For corroding steel, the anodic and the cathodic reactions produces the electrochemical cell. Corrosion protection of internal pipeline surface is based mainly on chemical composition of gas and the use of inhibitors. Corrosion protection of the external steel surface of the product line involves coatings and cathodic protection.

5 Articles
Accès libre

The study on corrosion of Pb–Sn–Sb alloys in soil

Publié en ligne: 22 Apr 2015
Pages: 1 - 6

Résumé

Abstract

The paper studies corrosion of selected Pb-Sn-Sb alloys in soil. Corrosion tests were proposed and performed based on the survey of the mechanism of corrosion of archaeological objects – letter types. The composition of tested lead alloys corresponds to the phases in structures of alloys the original types were made from. Three types of soil with different pH were selected as the corrosion environment and one of the set of specimens was exposed additionally to acetic acid vapours to monitor the impact of volatile organic compounds. The results were compared with similar corrosion tests performed at the University of Antwerp. The results implied that it was predominantly the character of the microstructure the lead alloys form that affects corrosion of Pb–Sn–Sb alloys. Intermetallic phases SnSb are formed within the lead matrix, the average composition of which corresponds to 55 % of Sn and 45 % of Sb. The SnSb phase is very hard and resistant; a corrosion microcell is formed when in contact with the matrix, with the lead matrix being preferentially susceptible to corrosion. The content of antimony and tin in the alloy affects formation and the quantity of the SnSb phase.

Accès libre

Program of experimental atmospheric corrosion tests of weathering steels

Publié en ligne: 22 Apr 2015
Pages: 7 - 18

Résumé

Abstract

This article presents the program of experimental atmospheric corrosion test of weathering steels. This program is designed as a long-term project. Attention is paid to study of corrosion processes at different structural elements of supporting structures of bridges. Measurements of corrosion losses and average thicknesses of corrosion products are carried out within this experimental program. Protective ability of corrosion products is evaluated using X-ray diffraction analysis. The article presents results of corrosion tests after one year of exposure of corrosion specimens. It results from the tests that corrosion losses of weathering steels are signifi cantly conditioned by position and location of exposed surface within the structure.

Accès libre

Ex-situ characterization of pre- and post-transient specimens of Zr1Nb alloys

Publié en ligne: 22 Apr 2015
Pages: 19 - 23

Résumé

Abstract

The ex-situ tests were performed with Zr1Nb alloy specimens that had been pre-exposed to the environment with an elevated concentration of lithium (70 ppm Li as LiOH) at the temperature of 360 °C for a period of 63 to 77 days prior to the measurement. The impedance changes at the phase alloy- -oxide-electrolyte interface were monitored using the ex-situ electrochemical impedance spectroscopy. At the same time, the progress of electrolyte penetration in the oxide porous structure was studied. The oxidic layer and the electrolyte penetration are characterized by the elements of the equivalent circuit model and Jonscher analysis that enables calculation of the dielectric thickness of the oxide.

Accès libre

Flexible binders, their degradation and impact on cement substrate

Publié en ligne: 22 Apr 2015
Pages: 24 - 29

Résumé

Abstract

Compared to the traditional inorganic binders based on mortar or plaster, cementing clefts and cracks with polymer fl exible binders is effective in terms of better adhesion and fl exibility. Nevertheless, in order to be applicable in restoration practice they must comply with the condition of a minimum impact on the substrate, which frequently is a porous material. Silicon-based binders, synthetic rubber and hybrid binders based on silicone modifi ed with polyurethane and polyether were tested in this study. The binders were artifi cially aged under various conditions. At the same time, the study also focused on the extent of infl uencing of the porous cement substrate by the application of binders. The silicone binders showed the best resistance to artifi cial aging, however, the originally hydrophilic substrate became hydrophobic. Hybrid binders showed better resistance to moist rather than dry atmosphere. Testing in the QUV panel caused cracking and incoherence of all hybrid bonders. Various categories of binders showed similar properties in terms of resistance to aging and the extent of infl uencing of the porous substrate. The porous cement substrate was reported to be substantially infl uenced by all tested binders. Therefore, none of the tested binders can be unambiguously recommended for application in restoration practice.

Accès libre

Selected types of corrosion degradation of pipelines

Publié en ligne: 22 Apr 2015
Pages: 30 - 36

Résumé

Abstract

The paper deals with corrosion degradation of gas pipeline. Pipelines play very important role as means transporting gas media over long distances from producers to end-users. Gas pipelines present a risk of potential corrosion degradation that can result in their failure. Corrosion on internal surfaces of steel pipes takes place in CO2, H2S, H2O and chloride environment. Degradation of steel results in loss of mechanical properties, reduction in thickness and ultimate perforation and failure. Corrosion is the electrochemical process that involves the fl ow of electrical currents on a micro or macro scale. For corroding steel, the anodic and the cathodic reactions produces the electrochemical cell. Corrosion protection of internal pipeline surface is based mainly on chemical composition of gas and the use of inhibitors. Corrosion protection of the external steel surface of the product line involves coatings and cathodic protection.

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