李文川,徐霸津,凌国平

• 1:浙江大学材料科学与工程学系

摘要(Abstract)：

通过先在水溶液中电镀Cr之后再在摩尔比为2∶1的AlCl3-EMIC(氯化1-甲基3-乙基咪唑)离子液体电镀Al的方法,在1Cr17钢表面制备出Cr/Al复合镀层。研究了在740℃条件下不同时间热处理对涂层组织和结构的影响。光学显微镜、二次电子和特征X射线能谱及X射线衍射研究结果表明:Cr/Al复合镀层通过740℃热处理可以得到Al-Cr涂层,随着时间的延长,外表面合金层成分依次按Al4Cr→Al11Cr4→Al9Cr4→Al8Cr5变化,最后形成单相的Al8Cr5,且涂层与基体之间不发生明显的互扩散;在5～20 min内Al9Cr4成分层的厚度及反应掉的Cr镀层厚度与时间平方根符合线性关系;氮气气氛中热处理可以减少涂层表面的空洞。显微硬度测试结果表明:Al8Cr5的脆性小,且硬度高于其他3种合金层。

关键词(KeyWords)： Cr/Al复合镀层;离子液体;热处理;Al8Cr5

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 李文川,徐霸津,凌国平

DOI: 10.13289/j.issn.1009-6264.2011.05.028

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