摘要
从镁合金表面自然氧化膜的微观结构与形成过程入手 ,论述了其表面多孔状的三层氧化膜造成镁合金基体表面容易发生腐蚀的原因 ,并详述镁合金表面的电化学腐蚀特性与腐蚀机理 ;从三个不同角度分析其独特的负差数效应 ,并用“部分膜保护机制”对此作出更合理的解释 .讨论了阳极氧化技术及其在此基础之上发展而来的等离子微弧阳极氧化技术 ,该技术可显著提高镁合金表面氧化膜的耐蚀性与抗磨性 .介绍了包括激光表面热处理和激光合金化的激光辅助处理技术 ,它能对镁合金表面进行快速、局部的处理 ,提高材料的耐腐蚀性能和硬度 .概述了物理气相沉积技术 ,它可为镁合金表面提供耐腐蚀性能、高结晶度和高强度 .讨论了目前国内外最新研究的用于取代有毒的铬酸盐转化膜的稀土转化膜工艺的化学法 ;该方法具有操作简便、无毒无污染等诸多特点 ,可以明显提高镁合金表面的耐腐蚀性能 ,但机理研究有待于进一步探讨 .
The formation process and structure of oxidation film on surface of Mg alloy was described to explain its tendency of corrosion, and the corrosion mechanism was presented. Its unique negative difference effect was analyzed from three different viewpoints, using a more reasonable theory. Some protection techniques for the improvement of corrosion resistance in the surface of Mg alloy were introduced, including anodic oxidation which can provide good corrosion and abrasion resistance, laser aided treatment which can be applied easily to the local surface for improvement, physical vapor deposition which can improve surface anticorrosion, greater degree of crystallinity and higher strength, and chemical treatment where a developed RE conversion coating without any toxicity can replace the harmful chromate protective film.
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2001年第6期753-755,共3页
Journal of Harbin Institute of Technology
基金
国家留学回国人员基金资助项目 ( 970 75 1-0 0 1)
哈尔滨工业大学理学基金资助项目 ( 990 75 1-0 0 6 )
关键词
镁合金
腐蚀
防护技术
阳极氧化
Anodic oxidation
Corrosion
Laser applications
Protective coatings
Surface properties
