AZ91D镁合金化学镀Ni-P及Ni-W-P镀层的结构与耐蚀性

中国腐蚀与防护学报, 2010, 30(3): 177-180.

AZ91D镁合金化学镀Ni-P及Ni-W-P镀层的结构与耐蚀性

1.1．东北大学材料与冶金学院沈阳 1108192. 沈阳航空航天大学材料科学与工程学院沈阳 110136>

1.1. College of Materials and Metallurgy, Northeastern University，Shenyang 1108192. School of Materials Science and Engineering, Shenyang University of Aeronauitical and Astronautics, Shenyang 110136>

基金项目: 十一五&rdquo &ldquo 国家科技支撑计划项目（2006BAE04B09－7）和沈阳市人才资源专项（2007010303025）资助

关键词： AZ91D镁合金 , Ni-P coating , Ni-W-P coating , corrosion resistance

STRUCTURE AND CORROSION RESISTANCE OF ELECTROLESS PLATING Ni-P AND Ni-W-P COATINGS ON AZ91D MAGNESIUM ALLOY

LI Duanyang , SHEN Bo , REN Yuping , PEI Wenli , YANG Zhongdong , WANG Jijie , QIN Gaowu

Keywords： AZ91D magnesium alloy , Ni-P镀层 , Ni-W-P镀层 , 耐蚀性

在AZ91D镁合金上直接化学镀Ni-P和Ni-W-P镀层，并利用扫描电子显微镜、X射线衍射仪及电化学工作站研究后续热处理对化学镀层组织形貌、相组成及其耐蚀性的影响。结果表明，制备的Ni-P镀层为非晶态，而Ni-W-P镀层为纳米晶结构，两者在3.5%NaCl水溶液中的耐蚀性相当。热处理可以明显提高Ni-W-P镀层的耐蚀能力，但却稍微弱化Ni-P镀层的耐蚀能力，热处理后的Ni-W-P层自腐蚀电位相对于未处理的化学镀Ni-W-P或Ni-P层提高了约150 mV。

Ni-P and Ni-W-P coatings were prepared on AZ91D magnesium alloy by a direct electroless plating processing. The microstructure, phases and corrosion resistance of the prepared and post-annealed coatings were studied by using scanning electron microscopy, X-ray diffraction technique and electrochemical test. The results show that the Ni-P coating is of amorphous structure while the Ni-W-P coating is of nanocrystalline structure with a grain size of about 7 nm, and they have similar corrosion resistance against 3.5%NaCl aqueous solution. The corrosion potential of the Ni-W-P coating after annealing at 250℃ for 50 min positively shifts by 150 mV as compared to that of as-prepared Ni-W-P or Ni-P coating, implying the corrosion resistance of the annealed Ni-W-P coatings has been much improved.

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