The strain-induced accelerated corrosion has been reported for many alloys used in structural and functional applications. To understand the effect of cold-work on corrosion behavior of alloys, specimens of carbon steel A569, strained to different amounts by cold-rolling, were used. The strain energy stored in cold-rolled specimens can increase the driving force for the iron oxidation reaction, therefore influencing the repassivation and corrosion behavior of A569. As a result, cold-rolled carbon steel specimens, in their active state, undergo a higher general corrosion rate than the equivalent annealed carbon steel specimens. In stable repassivation conditions, repassivation of the cold-rolled A569 specimens is slightly faster than the annealed specimens, where the repassivation reaction is expected to dominate over the Fe oxidation reaction. On the contrary, under unstable-passivity conditions, the passive current increases with the cold work. The higher passive current due to the presence of cold-work results in the earlier pit initiation in polarization tests. Results from electrochemical tests on specimens with different amounts of cold-work are discussed in this paper.

Subject
Materials, Passive films, Repassivation, Active dissolution, Borate, Current densities, Film formation, Passivation, Carbon steel, Risk reduction, Polarization, Residual stress, Oxidation
Keywords:
cold-work/cold-rolling, strain, driving force, active dissolution, repassivation, early pit initiation, carbon steels
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2017
Association for Materials Protection and Performance (AMPP)
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