黄铜表面植酸钝化膜耐蚀性及其成膜机理

发布时间：2018-01-16 14:03

本文关键词：黄铜表面植酸钝化膜耐蚀性及其成膜机理　出处：《表面技术》2017年09期 　论文类型：期刊论文

【摘要】：目的通过化学浸泡法在黄铜表面获得植酸钝化膜,并研究其成膜机理。方法采用硝酸点滴、中性盐雾试验和极化曲线测试,研究植酸钝化膜的耐蚀性。通过SEM、XRD对植酸钝化膜的形貌和组成进行分析,并测试黄铜试样钝化过程的电位-时间曲线,推测植酸钝化膜的成膜机理。结果与铬酸盐转化膜对比,黄铜表面植酸钝化膜的自腐蚀电流密度小于铬酸盐转化膜,腐蚀速率比重铬酸盐钝化膜小。经测试,植酸钝化膜的外观平整,结构致密,主要成分为植酸盐、Al_2O_3和ZnO。钝化过程的电位-时间曲线显示,黄铜试样的电位在前60 s从-0.172 V迅速升高到-0.157 V,随后电位升高的速度逐渐变缓,在150 s后电位变化微小。结论在黄铜表面形成的植酸钝化膜具有良好的耐腐蚀性能。植酸钝化膜的成膜过程分为黄铜表面的溶解和植酸钝化膜的形成两个过程。
[Abstract]:Objective to obtain phytic acid passivated film on brass surface by chemical soaking method and study its film forming mechanism. Methods nitric acid drip neutral salt spray test and polarization curve test were used. The corrosion resistance of phytic acid passivating film was studied. The morphology and composition of phytic acid passivation film were analyzed by means of SEM XRD, and the potential-time curves of the passivation process of brass sample were measured. Results compared with chromate conversion film, the corrosion current density of phytic acid passivation film on brass was lower than that of chromate conversion film, and the corrosion rate was smaller than that of chromate passivation film. Phytic acid passivation film has a flat appearance and compact structure. The main components are phytate Al2O3 and ZnO.The potential-time curves of passivation process are shown. The potential of the brass sample increased rapidly from -0.172 V to -0.157 V in the first 60 seconds, and then the increasing rate of the potential gradually slowed down. At 150. Conclusion the phytic acid passivation film formed on the brass surface has good corrosion resistance. The film formation process of the phytic acid passivation film can be divided into two processes: the dissolution of the brass surface and the formation of the phytic acid passivation film.
【作者单位】：江西理工大学工程研究院;江西理工大学材料科学与工程学院;赣州富尔特电子股份有限公司;
【基金】：国家自然科学基金(51561008) 江西省科技厅重点工业项目(20161BBE50030)~~
【分类号】：TG174.4
【正文快照】： Received:2017-03-15;Revised:2017-04-26Fund:Supported by Natural Science Foundation of China(51561008)and Key Industrial Projects of Jiangxi Science and Technology Depart-ment(20161BBE50030)黄铜具有良好的导电性、导热性,且强度高,易于加工,目前应用非常广泛。

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