摘要
研究了13Cr钢在高温高压环境中的乙酸腐蚀行为。13Cr钢腐蚀速率随乙酸浓度增加而增大。不含乙酸时,基体铬发生溶解并在表面形成Cr(OH)3钝化膜,溶液中侵蚀性离子(Cl-)的存在是发生点蚀的重要原因。加入乙酸后,乙酸电离H+使得溶液酸性增强,钝化膜稳定性降低。H+和Cl-更容易通过钝化膜与基体接触,促进局部酸性增强以及侵蚀性离子浓度增加,加快点蚀的发生和发展过程。随着乙酸浓度增加,酸性增强越明显,对点蚀的促进作用越强,腐蚀速率增加。
The corrosion behavior of 13 Cr steel in solution containing acetic acid under high temperature and high pressure conditions was investigated.The corrosion rate of 13 Cr increased with the increase of acetic acid concentration.When there was no acetic acid in the solution,the passive film of Cr（OH）3formed on the surface.Pitting happened because of the existence of chloride ions.When acetic acid was added,the acidity of solution was enhanced.And the stability of the film decreased.Hydrogen ions and chloride ions could pass through the film easily.The local acidity and the concentration of chloride ions increased.Then the process of pitting was accelerated.With the increase of the concentration of acetic acid,the solution became more and more acidic.Then the pitting was promoted obviously.And the corrosion rate increased.
出处
《腐蚀与防护》
CAS
北大核心
2015年第8期735-737,共3页
Corrosion & Protection
基金
长庆油田油气当量上产5 000万吨关键技术课题六(2011E-1306)
关键词
13Cr钢
乙酸
腐蚀
高温
高压
13Cr steel
acetic acid
corrosion
high temperature
high pressure
