铁素体不锈钢在盐酸溶液中的腐蚀过程

发布时间：2018-06-08 21:33

本文选题：铁素体不锈钢 + 盐酸酸洗　；参考：《东北大学学报(自然科学版)》2015年01期

【摘要】：利用电化学工作站,结合微观腐蚀形貌分析,研究了铁素体不锈钢在盐酸溶液中的腐蚀过程.结果表明:铁素体不锈钢在盐酸溶液中的腐蚀过程分为3个阶段:表面钝化膜的穿透、腐蚀产物膜的增厚以及阴阳极反应平衡.不锈钢在表面钝化膜的穿透和腐蚀产物膜的增厚阶段仅发生均匀腐蚀,而在反应平衡阶段不锈钢表面出现大量的晶间腐蚀和少量的点蚀.当盐酸质量分数大于10%时,铁素体不锈钢在盐酸溶液中的极化曲线钝化区完全消失,其腐蚀过程主要受阳极控制.随着盐酸质量分数的增大,溶液电阻Rs和电极反应的电荷转移电阻Rt均逐渐减小,同时腐蚀电极表面双电层结构中的充放电能力不发生改变.
[Abstract]:The corrosion process of ferrite stainless steel in hydrochloric acid solution was studied by electrochemical workstation and microcosmic corrosion morphology analysis. The results show that the corrosion process of ferrite stainless steel in hydrochloric acid solution is divided into three stages: the penetration of surface passivation film, the thickening of corrosion product film and the balance of cathode and anode reaction. During the penetration of the passivation film and the thickening of the corrosion product film, only uniform corrosion occurs on the stainless steel surface, while a large amount of intergranular corrosion and a small amount of pitting corrosion occur on the surface of the stainless steel in the reaction equilibrium stage. When the mass fraction of hydrochloric acid is greater than 10, the passivation zone of the polarization curve of ferrite stainless steel in hydrochloric acid solution disappears completely, and the corrosion process is mainly controlled by anode. With the increase of hydrochloric acid mass fraction, both the solution resistance Rs and the charge transfer resistance R _ t of the electrode reaction decrease gradually, while the charge and discharge capacity in the double-layer structure of the corrosion electrode surface does not change.
【作者单位】：东北大学多金属共生矿生态化冶金教育部重点实验室;
【基金】：中央高校基本科研业务费专项资金资助项目(N110602001)
【分类号】：TG142.71;TG172

【参考文献】