摘要
铝合金因其高的比强度、比刚度、优异的延展性及高导热性等特性,广泛应用于航空航天、交通运输、化工及包装等领域,但铝合金中合金元素的加入对其耐蚀性不利。因此,在大多数应用中,需要对其进行表面处理。六价铬转化膜是在铝合金中使用最久、耐蚀性最好、且可自修复的化学转化膜,但因六价铬有毒且致癌,受到了各国严格限制,促使对其替代工艺的研发,其中三价铬转化膜是目前最有前景的一种替代工艺。从三价铬转化工艺、转化膜结构和成膜机理、腐蚀行为、自愈性等几方面综述了铝合金三价铬转化膜的研究和发展现状,以期为新型铝合金表面处理技术的研发提供参考和依据。
Aluminum alloys are widely used in aerospace,transportation,chemical and packaging due to their high specific strength,specific stiffness,excellent ductility and high thermal conductivity.However,the addition of alloying elements in aluminum alloys is detrimental to their corrosion resistance.Therefore,surface treatment is required for most applications of aluminum alloys.Of all chemical conversion coatings for aluminum alloys,hexavalent chromium conversion coatings are probably the most long-lived and corrosion resistance one,in addition to their self-healing capacities.Nevertheless,the process has been rigidly restricted by many countries because of the toxic and carcinogenic hexavalent chromium,prompting the development of alternatives.Trivalent chromium conversion coatings are currently one of the most promising alternatives to hexavalent chromium conversion coatings.The research and development status of trivalent chromium conversion coatings on aluminum alloys is reviewed from the aspects of processes,coating structures,formation mechanism,corrosion behavior and self-healing effect.The work will provide a reference and basis for the research and development of new surface treatment technologies for aluminum alloys.
作者
王维青
左浩越
杨宏
麻彦龙
WANG Weiqing;ZUO Haoyue;YANG Hong;MA Yanlong(College of Materials Science and Engineering,Chongqing University of Technology,Chongqing 400054,China)
出处
《重庆理工大学学报（自然科学）》
CAS
北大核心
2021年第11期81-94,共14页
Journal of Chongqing University of Technology：Natural Science
基金
重庆英才·创新创业领军人才计划项目(CQYC201903051)
重庆市高校创新研究群体项目(CXQT20023)
重庆市巴南区科技成果转化及产业化专项(2020年)。
关键词
铝合金
三价铬转化膜
成膜机理
耐蚀性
六价铬
aluminum alloys
trivalent chromium conversion coatings
mechanism of coating formation
corrosion resistance
hexavalent chromium
作者简介
王维青,女,博士,主要从事金属材料的组织调控及腐蚀防护研究,E-mail:wangweiqing@cqut.edu.cn;通讯作者:麻彦龙,男,博士,教授,博士生导师,主要从事先进轻合金材料腐蚀防护与表面工程相关研究,E-mail:myl@cqut.edu.cn。
