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51318-11074-Effect of Elastic and Plastic Strain on General Corrosion and Metastable Pitting of Steels

Picture for Effect of Elastic and Plastic Strain on General Corrosion and Metastable Pitting of Steels
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The influence of elastic strain on general corrosion and metastable pitting is investigated for steels through in-situ test setup. Results from electrochemical tests on specimens with different amounts of in-situ elastic strain.

Product Number: 51318-11074-SG
Author: Gaoxiang Wu / Preet M. Singh
Publication Date: 2018
Industry: Science of Corrosion
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The strain-induced accelerated corrosion has been reported for many alloys used in structural and functional applications. Strain is expected to increase the metals internal energy, hence increasing the oxidation tendency of metals. However, significant work has generally been concentrated on stress corrosion cracking and effect of plastic strain on corrosion. It is widely known that strained steels undergo a higher active dissolution rate than the unstrained ones. Under unstable passivity conditions, strain is also expected to alter the characteristics of passive film, leading to more frequent breakdown of passive film. In this study, the influence of elastic strain on general corrosion and metastable pitting is investigated for steels through in-situ test setup. In the active state, steels undergo activation-controlled general corrosion, the in-situ elastic strain is applied to carbon steel A516 (UNS K02100) to assess its quantitative influence on general corrosion. Under unstable passivity conditions, stainless steel 316L (UNS S31603) specimens are tested for the metastable pitting resistance under in-situ elastic strain conditions. Results from electrochemical tests on specimens with different amounts of in-situ elastic strain are discussed in this paper.

Key words: in-situ elastic strain, general corrosion, metastable pitting, carbon steels, stainless steels

The strain-induced accelerated corrosion has been reported for many alloys used in structural and functional applications. Strain is expected to increase the metals internal energy, hence increasing the oxidation tendency of metals. However, significant work has generally been concentrated on stress corrosion cracking and effect of plastic strain on corrosion. It is widely known that strained steels undergo a higher active dissolution rate than the unstrained ones. Under unstable passivity conditions, strain is also expected to alter the characteristics of passive film, leading to more frequent breakdown of passive film. In this study, the influence of elastic strain on general corrosion and metastable pitting is investigated for steels through in-situ test setup. In the active state, steels undergo activation-controlled general corrosion, the in-situ elastic strain is applied to carbon steel A516 (UNS K02100) to assess its quantitative influence on general corrosion. Under unstable passivity conditions, stainless steel 316L (UNS S31603) specimens are tested for the metastable pitting resistance under in-situ elastic strain conditions. Results from electrochemical tests on specimens with different amounts of in-situ elastic strain are discussed in this paper.

Key words: in-situ elastic strain, general corrosion, metastable pitting, carbon steels, stainless steels

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