Abstract

Influences of previous electrochemical corrosion and chemical corrosion in H₂SO₄ aqueous solution on surface layer softening during electrochemical cold drawing (ECD) of Q235 steel bar were investigated. Results indicate that these two corrosions all further soften the steel during the subsequent ECD and make the ECD to easier conduct, and the effect from the former corrosion is larger than that from the latter one. Two modes of corrosion can slightly soften or plasticize the bar surface layer due to the increased vacancy clusters, but the contribution of this softening or plasticizing itself to the further softening during ECD is very limited, and the further softening should be mainly attributed to the relaxation of dislocations through absorbing the vacancy clusters and the resulted weakening of work hardening. The current applied during the electrochemical corrosion can promote more vacancy clusters to form in a deeper region beneath the bar surface, and thus the relaxing degree for the dislocations and the influence region are larger than those from the chemical corrosion respectively, resulting in the greater softening.

Graphic Abstract

中文翻译：

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Q235棒材电化学冷拔过程中先前电化学腐蚀对表面层软化的影响

摘要

H ₂ SO ₄中先前电化学腐蚀和化学腐蚀的影响研究了Q235钢筋电化学冷拔（ECD）过程中表面层软化的水溶液。结果表明，这两种腐蚀都会在随后的ECD中进一步软化钢，使ECD易于传导，前一种腐蚀的影响大于后一种腐蚀的影响。由于空位簇的增加，两种腐蚀方式可使棒材表面层轻微软化或塑化，但是这种软化或塑化本身对ECD期间进一步软化的贡献非常有限，进一步软化应主要归因于松弛通过吸收空缺群体来解决错位，从而削弱工作硬化。

图形摘要