将化学转化和化学镀镍结合在一起,先对AZ91D镁合金进行化学转化处理,然后在转化膜上进行化学镀镍.并用扫描电镜(SEM)、X射线衍射技术(XRD)研究了镀层表面形貌和组织结构及处理后镁合金的耐蚀性能.结果表明:两种工艺结合得到的镀层使腐蚀电位正移0.83 V,腐蚀电流降低,有效的提高了镁合金耐腐蚀性能.
In order to enhance the anti-corrosion performance of AZ91D magnesium alloy, a composite coating cosisted of pre-phosphorization and electroless plating of nickel was investigated in detail. Firstly, the chemical conversion coating on AZ91D magnesium alloy was obtained in phosphate-permanganate so-lutions, and then electroless nickel plating was carried out on the conversion coatings. The surface mor-phology, phase constituents of the conversion coatings and the plated Ni-coatings were examined by scan-ning electron microscope (SEM)and X-ray diffraction (XRD). The results show that a compact, uniform Ni layer with good adhesion was deposited on AZ91 D Mg alloy. The measurements of potentiodymaic polari-zation indicate that the anti-corrosion property of Mg alloy was improved greatly by the composite coating.
参考文献
| [1] | Gray J E,Luan B.Protective coatings on magnesium and its alloys-a critical review[J].Journal of Alloys and Compounds,2002,336(1 -2):88. |
| [2] | 杨黎晖,李峻青,姜巍巍,等.镁合金表面处理技术的研究进展[J].中国腐蚀与防护学报,2008,28(5):316. |
| [3] | 王卫锋,蒋百灵,时惠英.镁合金微弧氧化深色陶瓷膜制备及耐蚀性研究[J].腐蚀科学与防护技术,2007,19(1):51. |
| [4] | Lin C S,Lin H C,Lin K M,et al.Formation and properties of stannate conversion coatings on AZ61 magnesium alloys[J].Corrosion Science,2006,48 (1):93. |
| [5] | 张丽君,张昭,张鉴清.阳极氧化AZ91D镁合金在氯化钠稀溶液中的腐蚀行为[J].物理化学学报,2008,24(10):1831. |
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