耐候钢新型表面锈层稳定剂处理及其耐3.5%NaCl溶液周浸腐蚀性能

发布时间：2018-02-27 19:23

本文关键词： 耐候钢免涂装表面处理锈层稳定化大气腐蚀锈层电阻　出处：《表面技术》2017年08期 　论文类型：期刊论文

【摘要】：目的解决耐候钢裸露使用初期锈液流挂与飞散的问题。方法制备了新型耐候钢表面锈层稳定剂,通过周期浸润循环腐蚀试验、锈层微观分析和电化学测试等方法研究了在模拟海洋大气环境下,锈层稳定剂对耐候钢锈层结构及耐腐蚀性能的影响。结果表面锈层稳定化处理后,耐候钢表面生成的锈层区分为致密且连续的内锈层和外锈层。室内加速腐蚀168 h后,耐候钢的失重腐蚀速率由未处理的5.71 g/(m~2×h)降低到表面处理后的3.31 g/(m~2×h),失重腐蚀速率降低了约42%。耐候钢的锈层电阻由未处理的96?·cm~2提高到表面处理后的167.7?·cm~2,锈层电阻提高了约75%。表面处理后的耐候钢锈层中,Cr元素以α-(Fe_(1-x)Cr_x)OOH的形式存在于基体与锈层的界面处,Cr元素在内锈层与基体结合处发生聚集。结论新型锈层稳定剂可以明显改善耐候钢锈层结构,细化锈层晶粒,阻碍Cl~-的渗透,有助于耐候钢表面快速生成致密、连续且稳定的保护性锈层。
[Abstract]:Objective to solve the problem of liquid rust hanging and dispersing in the initial stage of weathering steel. Methods A new type of surface rust stabilizer of weathering steel was prepared, and the corrosion test was carried out by cycle infiltrating cycle. The effect of rust stabilizer on the structure and corrosion resistance of weathering steel was studied by means of microanalysis and electrochemical measurement. The rust layer formed on the weathering steel surface is divided into dense and continuous inner rust layer and external rust layer. The weight loss corrosion rate of weathering steel decreased from 5.71 g / m ~ (2 脳 h) to 3.31 g / m ~ (2 脳 h) after surface treatment, and the weight loss corrosion rate decreased by 42%. The rust layer resistance of weathering steel decreased from 96? 路cm~2 increased to 167.7? 路cm-2, the resistance of rust layer increased by about 75%. The Cr element in the rusty layer of weathering steel after surface treatment existed in the form of 伪 -fen FeD 1-xCX OOH at the interface between the matrix and the rusty layer. Conclusion the new rust-layer stabilizer can be used to combine the rust layer with the matrix. In order to obviously improve the weathering steel rust layer structure, The grain refinement of rust layer hinders the penetration of Cl-, which is helpful for the rapid formation of dense, continuous and stable protective rust layer on weathering steel surface.
【作者单位】：首钢技术研究院;
【分类号】：TG174.4

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