金属缝隙腐蚀的成因及实验验证

发布时间：2018-01-22 06:29

本文关键词： 金属缝隙腐蚀三氯化铁　出处：《表面技术》2017年02期 　论文类型：期刊论文

【摘要】：在制品和工程结构中,缝隙腐蚀是一种很普遍且隐蔽的局部腐蚀,其结果会导致构件强度降低,既降低服役寿命,也存在安全隐患。指出缝隙腐蚀发生的三个必要条件——制品或工程结构中有金属或合金、有缝隙的存在、缝隙内有腐蚀介质滞留,概述了缝隙腐蚀的特征及三个阶段。分析了缝隙腐蚀的影响因素,包括金属性质、环境因素(溶液中氧、氯离子浓度,温度,p H值以及溶液的流速)和缝隙的几何形状。介绍了在实验室用三氯化铁溶液验证不锈钢及其合金的缝隙腐蚀敏感性的基本步骤,提出了在工程实际中如何预防缝隙腐蚀的基本思路。
[Abstract]:Crevice corrosion is a common and covert local corrosion in workpieces and engineering structures, which results in lower strength and lower service life. It is pointed out that there are three necessary conditions for crevice corrosion-metal or alloy in the product or engineering structure, existence of gap, and corrosion medium remaining in the crevice. The characteristics and three stages of crevice corrosion were summarized, and the influencing factors of crevice corrosion, including metal properties, environmental factors (oxygen in solution, concentration of chloride ion, temperature) were analyzed. Ph value and flow rate of the solution) and geometric shape of the crevice. The basic steps to verify the crevice corrosion sensitivity of stainless steel and its alloys using ferric chloride solution in laboratory are introduced. The basic idea of how to prevent crevice corrosion in engineering practice is put forward.
【作者单位】：重庆育才成功学校;西南技术工程研究所;
【分类号】：TG172.2
【正文快照】： Received:2016-11-09;Revised:2017-01-08金属及其构件与环境相互作用,导致性能发生演变,腐蚀是这种演变最常见的宏观表现。金属表面与其他金属或非金属表面形成狭缝或间隙,在狭缝内或近旁发生的局部腐蚀称为缝隙腐蚀[1]。缝隙腐蚀是一种很普遍的隐蔽的局部腐蚀,缝隙内腐蚀产

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