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Effect of Cold-work on Repassivation and Corrosion Behaviors of Carbon Steels and Stainless Steels

Picture for Effect of Cold-work on Repassivation and Corrosion Behaviors of Carbon Steels and Stainless Steels
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The strain-induced accelerated corrosion has been reported for many alloys used in structural and functional applications. . Results from electrochemical tests on specimens of carbon steel A569 with different amounts of cold-work are discussed in this paper.

Product Number: 51317--9083-SG
ISBN: 9083 2017 CP
Author: Gaoxiang Wu
Publication Date: 2017
Industry: Materials Selection and Design
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The strain-induced accelerated localized corrosion has been reported for many alloys in structural and functional applications. To understand the effect of cold-work on corrosion behavior of alloys samples of carbon steel A569 and stainless steels strained to different amounts by cold rolling were used to study on their corrosion behavior. The strain energy stored in cold-worked samples can increase the driving force for both types of reactions (i.e. active corrosion or repassivation) therefore enhancing the chemical reaction rates. As a result cold-rolled carbon steel samples in their active state undergo a higher general corrosion rate than the equivalent annealed carbon steel samples and the effect is enhanced at elevated temperatures. However the cold-worked carbon steel samples form a passive film in the borate buffer solution at a faster rate than the annealed carbon steel samples. Pitting behavior was also found to accelerate on cold-worked samples which caused pitting potential to decrease compared to the annealed samples. Results from electrochemical tests on samples with different degree of cold-work are discussed in this paper.

Key words: cold-work/cold-rolling, strain, driving force, active dissolution, repassivation, early pit initiation, carbon steels

The strain-induced accelerated localized corrosion has been reported for many alloys in structural and functional applications. To understand the effect of cold-work on corrosion behavior of alloys samples of carbon steel A569 and stainless steels strained to different amounts by cold rolling were used to study on their corrosion behavior. The strain energy stored in cold-worked samples can increase the driving force for both types of reactions (i.e. active corrosion or repassivation) therefore enhancing the chemical reaction rates. As a result cold-rolled carbon steel samples in their active state undergo a higher general corrosion rate than the equivalent annealed carbon steel samples and the effect is enhanced at elevated temperatures. However the cold-worked carbon steel samples form a passive film in the borate buffer solution at a faster rate than the annealed carbon steel samples. Pitting behavior was also found to accelerate on cold-worked samples which caused pitting potential to decrease compared to the annealed samples. Results from electrochemical tests on samples with different degree of cold-work are discussed in this paper.

Key words: cold-work/cold-rolling, strain, driving force, active dissolution, repassivation, early pit initiation, carbon steels

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