Influence of Rolling Force on Corrosion Resistance of Interstitial-Free Auto Sheet Steel

Abstract:

A three dimensional (3D) surface profiler, an X-ray residue stress tester, a potentiodynamic polarization approach and a damp heat test were employed to investigate the relationship between the rolling force (RF) and the corrosion resistance of interstitial-free (IF) auto sheet steels. The results show that the change of rolling force induces the variance of the surface topography and surface residue stress of IF steel. With the increasing RF, the corrosion resistance of IF steel in damp heat test can be enhanced, and the corresponding corrosion current density declines. Further, it is proved that the tensile stress on the surface can accelerate the corrosion rate of IF steel. As the compressive stress and the valley proportion on the surface increase, IF steel samples present a better corrosion resistance, because the compressive stress could retard the diffusion of corrosion media and the valley position possesses a lower electrochemical activity.

• Periodical: Materials Science Forum (Volume 941)
• Pages: 1710-1715
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.941.1710
• Online since: December 2018
• Authors: Bai You Fang, Yang Yu, Lin Lu*
• Keywords: Corrosion Resistance, Interstitial-Free Steel, Residue Stress, Rolling Force, Surface Profile

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