铁素体不锈钢在盐酸溶液中的缓蚀行为控制  

Corrosion Inhibition Control of Ferritic Stainless Steel in Hydrochloric Acid Electrolytes

作　　者：岳莹莹[1] 刘承军[1] 史培阳[1] 姜茂发[1] 

机构地区：[1]东北大学多金属共生矿生态化冶金教育部重点实验室,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2014年第11期1556-1560,共5页Journal of Northeastern University(Natural Science)

基　　金：国家重点基础研究发展计划项目(2012CB626812);国家自然科学基金资助项目(51104039);教育部新世纪人才计划项目(NCET-11-0077);辽宁省自然科学基金资助项目(201102062);辽宁省科技攻关项目(2012221013)

摘　　要：通过电化学方法、失重曲线和SEM分析,考察了铁素体不锈钢在盐酸溶液中的腐蚀过程,重点分析了SDS和SAD两种缓蚀剂对盐酸溶液中不锈钢腐蚀行为的控制作用.研究结果表明:不锈钢在单一盐酸溶液中始终保持活性溶解状态,腐蚀方式以均匀腐蚀为主,沿晶界处易发生晶间腐蚀.SDS和SAD缓蚀剂均为界面型缓蚀剂,其缓蚀效率存在极大值.当缓蚀剂质量分数为0.015%时,两种缓蚀剂均表现出良好的缓蚀性能,可降低不锈钢在盐酸溶液中的腐蚀速度.在相同浓度条件下,SAD缓蚀效率高于SDS缓蚀剂.Electrochemical method, weight loss and scanning electron microscope （SEM） were employed to investigate the corrosion behavior of ferritic stainless steel in hydrochloric acid electrolytes. SDS （sulfosalicylic acid dihydrate） and SAD （sodium doclecyl sulfate） were tested as corrosion inhibitors for ferritic stainless steel in 5% HC1 at 40~C. The results showed that the ferritic stainless steel keeps active dissolving in hydrochloric acid electrolytes and suffers from uniform corrosion accompanied with intergranular corrosion along the grain boundaries. Both SDS and SAD are interface inhibitors and their inhibition efficiency have a threshold. When the concentration of inhibitor is 0. 015% , both the two inhibitors decrease dramatically the corrosion rate of stainless steel. The inhibiting efficiency of SAD is higher than that of SDS under the same concentrations.

关 键 词：铁素体不锈钢 盐酸 酸洗 腐蚀 缓蚀剂 

分 类 号：TG174.3[金属学及工艺—金属表面处理]