摘要
为了研究汽油体系中Q235钢的腐蚀行为及腐蚀机理,通过改变乙硫醇体积分数和介质导电性研究了Q235钢的腐蚀行为,并从自组装膜的不完整性角度探讨了腐蚀机理.结果表明,汽油体系中乙硫醇具有较强的腐蚀性,腐蚀速率随乙硫醇体积分数的增加而增大.当介质中含微量导电盐时,Q235钢的腐蚀速率显著增大.腐蚀产物以Fe的氧化物为主,且含少量硫铁化物.乙硫醇可吸附在Q235钢表面形成结构不完整的自组装膜,一方面,电离出少量的H+以中和吸氧反应产生的OH-,从而加速阴极过程;另一方面,C2H5S-与Fe2+结合生成二次腐蚀产物,促进了阳极过程,从而加速了腐蚀.
In order to clarify the corrosion behavior and mechanism of Q235 steel in the gasoline system, the corrosion behavior of Q235 steel was researched through changing the volume fraction of ethanethiol and the electrical conductivity of medium, and the corrosion mechanism was investigated from the incompleteness view of self assembled monolayer. The results show that the ethanethiol in the gasoline system has strong corrosivity for the Q235 steel, and the corrosion rates increase with increasing the volume fraction of ethanethiol. When a few conducting salts exist in the medium, the corrosion rates of Q235 prominently increase. In addition, the corrosion products are mainly iron oxides and a few ferric sulfides. The ethanethiol can absorb on the surface of Q235 steel and form self assembled monolayer with incomplete structure. On the one hand, a few H^＋ can be ionized which can counteract OH^- generated in the oxygen absorption reaction, and thus, the cathodic process can be accelerated. On the other hand, C2H5 S^- can combine with Fe^2＋ to produce secondary corrosion products, which can promote the anodic process, and thus, the corrosion can be accelerated.
出处
《沈阳工业大学学报》
EI
CAS
北大核心
2015年第4期387-392,共6页
Journal of Shenyang University of Technology
基金
国家自然科学基金资助项目(21171083)
辽宁省自然科学基金资助项目(201202125)
关键词
Q235钢
乙硫醇
腐蚀
自组装
浸泡实验
形貌观察
腐蚀产物
腐蚀机理
Q235 steel
ethanethiol
corrosion
self assembly
soaking test
morphology observation
corrosion product
corrosion mechanism
作者简介
张金辉（1965-），男，辽宁大连人，教授，主要从事石油化工腐蚀与防护以及硫铁化合物自燃等方面的研究．
