冷加工变形对1Crl8Ni9Ti不锈钢在含溴醋酸溶液中耐腐蚀性能的影响

Influence of Cold Working Deformation on Corrosion Resistance of 1Cr18Ni9Ti Stainless Steel in Acetic Acid Containing Br^- Ion

在室温条件下,通过单轴拉伸试验对1Cr18Ni9Ti不锈钢产生不同程度的塑性变形,利用铁磁法测量得到了塑性变形量与α′-马氏体相含量的关系。在此基础上,采用化学浸泡法和电化学测量技术对产生塑性变形的1Cr18Ni9Ti试样在含溴醋酸环境下的腐蚀行为进行了研究。结果表明：冷加工变形诱发马氏体相变,1Cr18Ni9Ti不锈钢的年腐蚀速率增加,点蚀电位下降,点蚀敏感性增强；但在18％～27％塑性变形量下,1Cr18Ni9Ti不锈钢耐腐蚀性能增强。

Plastic deformation with different levels was carded out by means of unlaxial tension tests at room temperature（25 ℃） for 1Cr18NigTi stainless steel. The relationship between plastic deformation and content of α＇- martensite phase was obtained by means of ferrmagnetometor. The corrosion behaviour of 1Cr18NigTi stainless steel with different levels of plastic deformation was studied by means of chemical immersion method and electrochemical method in acetic acid solution containing Br^-. The cold working deformation induced martensltic phase transformation, which resulted in increase in corrosion rate and decrease in pitting potential and pitting corrosion sensibility of deformed 1Cr18NigTi stainless steel in acetic acid containing Br^- ion. However, the corrosion resistance of 1Cr18NigTi stainless steel with 180%- 270% plastic deformation was improved.