Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第19卷    第5期    总第122期    2009年5月

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文章编号:1004-0609(2009)05-0854-07
酸浸蚀处理对AZ91D镁合金室温熔盐镀铝的影响
钱红妹,李  岩,凌国平

(浙江大学 材料与化学工程学院,杭州 310027)

摘 要: 采用酸性AlCl3-EMIC室温熔盐对AZ91D镁合金表面电沉积制备铝镀层,研究不同酸浸蚀处理对镀层与基体结合力的影响。采用刻划撕扯法对结合力进行判断,利用金相显微镜(OM)、SEM、EDS、XRD和XPS对镀层及酸浸蚀表面形貌、物相组成、元素价态进行观察和分析,采用盐雾实验法对镀层耐蚀性进行测定,并对镀层形貌的形成机理进行讨论。结果表明:对镁合金表面进行机械预处理后进行电沉积,得到的镀层不致密,且与基体的结合较差;对镁合金进行HF浸蚀后,仅能在镁合金表面得到致密均匀的铝镀层;而以稀磷酸为浸蚀液能同时改善镀层的致密性与基体的结合性能,镀层经两次撕扯后未脱落,对基体能起到良好的保护作用。

 

关键字: AZ91D镁合金;室温熔盐;铝;酸浸蚀

Influence of acid pickling on electrodeposition of aluminum on magnesium alloy in room temperature molten salts
QIAN Hong-mei, LI Yan, LING Guo-ping

College of Materials Science and Chemical Engineering, Zhejiang University, Hangzhou 310027, China

Abstract: The effects of different acid pickling processes on the adhesions between the AZ91D magnesium alloy substrate and aluminum coatings electrodeposited from the acid AlCl3-EMIC room temperature molten salts were studied. The adhesions were estimated by score-tearing test. The surface morphology, phase compositions and element valence of coatings/etched substrate were analyzed by OM, SEM, EDS, XRD and XPS. The corrosion resistance was tested by salt-spray. The formation mechanism of coating morphologies was also discussed. The results show that the aluminum coating is not dense and the adhesion between the coatings and substrate is not good after mechanical pretreatment on AZ91D substrate. The dense and uniform coatings can be electrodeposited on the AZ91D substrate after pretreated by hydrofluoric acid pickling. The density of coatings and the adhesion can be improved simultaneously by using diluted phosphoric acid as pickling solution, and thus, the coating provides good protection to the substrate.

 

Key words: AZ91D magnesium alloy; room temperature molten salts; aluminum; acid pickling

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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