铝带电镀黑铬及其改性后的耐腐蚀性能  

Corrosion Resistance of Electrodeposited Black Chromium Coating on Aluminum Strip

作　　者：唐伦圆[1,2] 潘勇[1,2] 朱岭[1,2] 蒋志杰[1,2] 

机构地区：[1]湘潭大学材料与光电物理学院,湖南湘潭411105 [2]湘潭大学低维材料及其应用技术教育部重点实验室,湖南湘潭411105

出　　处：《材料保护》2013年第10期9-10,14,共3页Materials Protection

基　　金：湖南省科技厅工业支撑计划一般项目(2011GK4002)资助

摘　　要：为了开发性能优良、价格低廉的太阳能热水器集热材料,对铝带进行了电镀黑铬。分别采用划痕法、HL-60-SS试验机测试了镀层的结合强度和耐中性盐雾腐蚀性能;探讨了增加预镀镍层厚度、浸油封闭处理对镀层耐腐蚀性能的影响,分析了其腐蚀机理。结果表明:铝带电镀黑铬层48 h中性盐雾试验后出现严重点蚀;腐蚀介质进入镀层内部后开始腐蚀,其产物主要为Al的氧化物,铝基材是腐蚀发生的主要场所;增加预镀镍层厚度,或对镀层浸油封闭处理均可有效提高电镀黑铬层的耐腐蚀性能。Electroplated black Cr coating was prepared on the surface of Al strip so as to develop high-performance inexpensive heat-collecting materials for solar energy water heater. The adhesion to substrate and corrosion resistance of as-prepared black Cr coating against neutral salt-spray were determined. The effects of thickness of pre-plated Ni coating and sealing of coating through immersion in oil on the corrosion resistance of the Cr coating were investigated. The corrosion mechanism of the electroplated black Cr coating was discussed in relation to scanning electron microscopic and energy dispersive spectrometric analyses. Results indicated that electroplated black Cr coating on Al strip experienced severe pitting after 48 h of neutral salt-spray test. The corrosive medium was penetrated into the interior of the Cr coating generating aluminum oxides as the major corrosive products. Moreover, increasing thickness of the pre-plated Ni coating and sealing of the Cr coating via immersion in oil both helped to effectively improve the corrosion resistance of the electroplated black Cr coating on Al strip.

关 键 词：电镀黑铬 铝带 耐腐蚀性能 点蚀 

分 类 号：TQ153.11[化学工程—电化学工业]