镀锌钝化45A钢外套螺母及平管嘴腐蚀分析
Corrosion Analysis on Wrap Nut and Flat Mouthpiece of Galvanized Passivation 45A Steel
摘 要
镀锌钝化的45A钢外套螺母和平管嘴，在机上装配使用一段时间后发现表面镀锌层色泽发暗、局部出现灰白色的腐蚀产物。通过宏观和微观形貌分析、能谱分析、金相检验，并结合零件的装配、试验流程分析，确定零件表面腐蚀是因气密试验中涂抹肥皂液未清洗所致。进一步的模拟验证试验结果表明：零件表面腐蚀程度与肥皂液残留的时间和浓度呈正相关，且高热、高湿的环境对腐蚀有促进作用。
外套螺母
平管嘴
腐蚀
气密试验
肥皂液
galvanized passivation
wrap nut
flat mouthpiece
corrosion
airtight test
soap liquid
Abstract
Phenomenons of zinc coating surface color darkening and locally appearing grayish white corrosion products, were found on the surface of the galvanized passivation 45A steel wrap nut and flat mouthpiece after assembly and use for some time. Through macroscopic and microscopic morphology analysis, energy spectrum analysis, metallographic examination, combined with assembly and test process analysis of the parts, it is confirmed that the surface corrosion of the parts was caused by the uncleaning of the soap liquid in the airtight test. Further simulation test results show that the corrosion degree of the surface of the part was positively correlated with the residual time and concentration of the soap liquid, and the high heat and high humidity environment promoted the corrosion.
中图分类号 TG174 DOI 10.11973/lhjy-wl201906010
所属栏目 质量控制与失效分析
基金项目
收稿日期 2018/8/20
修改稿日期
网络出版日期
作者单位点击查看
备注何军(1970-),女,高级工程师,硕士,主要从事材料失效分析工作,hejun132@163.com
引用该论文: HE Jun,ZHU Kai,LU Han,LI Guoqing,ZHU Ling. Corrosion Analysis on Wrap Nut and Flat Mouthpiece of Galvanized Passivation 45A Steel[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2019, 55(6): 406～411
何军,朱凯,路寒,李国庆,朱苓. 镀锌钝化45A钢外套螺母及平管嘴腐蚀分析[J]. 理化检验－物理分册, 2019, 55(6): 406～411
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【10】张亚博,彭华乔,苏正良,等. 飞机常用镀镉钢在机场道面除冰液中的腐蚀行为[J]. 腐蚀与防护,2016,37(11):865-868,872.
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