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采用应变电极技术研究了应变幅、应变速率与外加电位对形变中金属电化学腐蚀过程的影响。选用的体系为工业纯Fe-3.5%NaCl水溶液和A537钢-3.5%NaCl+1%NaNO2水溶液结果表明,塑性变形对阳极过程的加速作用大于对阴极过程的加速作用,这种作用主要发生在自腐蚀电位附近。在强阳极与强阴极极化区,由于强的分反应驱动力,单个反应的电流增大,导致了形变电流的增加相对不重要。活化体系的金属溶解电流主要受应变幅控制,而钝化体系则主要由应变速率控制,取决于应变活化区域的再钝化动力学过程.
The effects of strain amplitude, strain rate and applied potential on the electrochemical corrosion process of metal during deformation were investigated by using strain gauge electrode technology. The selected systems were industrial pure Fe-3.5% NaCl aqueous solution and A537 steel-3.5% NaCl + 1% NaNO2 solution. The results showed that the plastic deformation accelerated the anodic process more than the cathodic process, and this effect mainly occurred Near the self-corrosion potential. In strong anodes and strongly cathodically polarized regions, the current of a single reaction increases due to the strong driving force of sub-reactions, resulting in a relative increase in the deformation current which is relatively unimportant. The metal dissolution current of the activation system is mainly controlled by the strain amplitude, while the passivation system is mainly controlled by the strain rate, which depends on the reactivation kinetics of the strain activation region.