316L不锈钢在氯离子环境中的腐蚀行为

发布时间：2018-06-02 04:46

本文选题：点蚀行为 + L不锈钢　；参考：《材料保护》2015年08期

【摘要】：为了研究316L不锈钢在含Cl-环境中的腐蚀行为,采用浸泡和电化学相结合的方法,研究了其在不同Cl-浓度溶液中不同浸泡时间的腐蚀行为,采用扫描电镜(SEM)观察了腐蚀形貌。结果表明:316L不锈钢在含Cl-环境中的点蚀程度与Cl-浓度密切相关,随着Cl-浓度的增加,点蚀程度先增大后减弱,当Cl-浓度为3%时,点蚀最严重,当Cl-浓度超过3%时,点蚀减缓;316L不锈钢在Na Cl溶液中钝化膜的形成是缓慢的,膜结构具有不完整性,为点蚀的孕育、萌生提供了结构条件,而点蚀一旦形成,在自催化作用下继续发展;316L不锈钢在含Cl-体系中的腐蚀行为是Cl-浓度与溶解氧含量两因素共同作用的结果,溶液中Cl-含量的增加一方面为加速腐蚀提供了物质条件,促进腐蚀;另一方面减少了介质中溶解氧的含量,抑制了腐蚀,两者的综合作用使腐蚀得以控制。
[Abstract]:In order to study the corrosion behavior of 316L stainless steel in Cl-containing environment, the corrosion behavior of 316L stainless steel in different Cl-concentration solution for different immersion time was studied by means of immersion and electrochemical method. The corrosion morphology was observed by scanning electron microscope (SEM). The results show that the pitting degree of W316L stainless steel in Cl-containing environment is closely related to the Cl-concentration. With the increase of Cl-concentration, the pitting corrosion degree increases first and then weakens. When the Cl-concentration is 3, the pitting corrosion is the most serious, and when the Cl-concentration is above 3, the pitting corrosion is the most serious. The formation of passivation film in NaCl solution is slow, and the membrane structure is incomplete, which provides the structural conditions for the inoculation and initiation of pitting corrosion, but once the pitting is formed, The corrosion behavior of stainless steel in Cl-containing system is the result of two factors: Cl-concentration and dissolved oxygen content. On the one hand, the increase of Cl-content in solution provides material conditions for accelerated corrosion and promotes corrosion. On the other hand, the content of dissolved oxygen in the medium is reduced and the corrosion is restrained.
【作者单位】：辽宁石油化工大学机械工程学院;
【基金】：辽宁省教育厅科研项目(L2013154)资助
【分类号】：TG142.71

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