为了提高镁合金的耐磨耐蚀性,研究了一种镁合金直接化学镀Ni-P/Ni-W-P双层镀层的方法.采用扫描电镜(SEM)和X-射线衍分析射仪(XRD)分析了镀层的微观结构.对镀层进行了极化曲线分析,并进行了盐酸腐蚀试验和结合力试验.结果表明,该复合镀层组织致密无孔,具有较高的显微硬度和高耐蚀性.镀层硬度可达622 HKV,试样在10%的HCl溶液中可保持近3 h不腐蚀基体,对镁合金起到很好的保护作用.
In order to enhance the corrosion resistance and wear-resistance of magnesium alloy, an available method to deposit electroless Ni -P/Ni -W- P coatings on AZ91D magnesium alloy was discussed. The micro-structure of the coatings was analyzed by scanning electron microscope (SEM) and X-ray diffractmeter (XRD). The corrosion resistance of the coatings was estimated by electrochemical polarization measurements and 10% HCl solution immergence test. Results show that the complex coatings on AZ91D magnesium alloy can stand in 10% HCl solution for 3 h without corrosion, and the hardness of coatings can reach 622 HKV, which exhibits good adhesions. Therefore the coatings can offer reliable protection for AZ91D magnesium alloy.
参考文献
| [1] | Raymond F. Decker .The renaissance in magnesium[J].Advanced Materials & Processes,1998(3):31-33. |
| [2] | 周婉秋,单大勇,曾荣昌,韩恩厚,柯伟.镁合金的腐蚀行为与表面防护方法[J].材料保护,2002(07):1-3. |
| [3] | Amy L. Rudd;Carmel B. Breslin;Florian Mansfeld .The corrosion protection afforded by rare earth conversion coatings applied to magnesium[J].Corrosion Science,2000(2):275-288. |
| [4] | J.E. Gray;B. Luan .Protective coatings on magnesium and its alloys-a critical review[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2002(1/2):88-113. |
| [5] | Niu LY;Jiang ZH;Li GY;Gu CD;Lian JS .A study and application of zinc phosphate coating on AZ91D magnesium alloy[J].Surface & Coatings Technology,2006(9):3021-3026. |
| [6] | A. K. Sharma;M. R. Suresh;H. Bhojraj;H. Narayanamurthy;R. P. Sahu .Electroless nickel plating on magnesium alloy[J].Metal finishing,1998(3):10-25. |
| [7] | C. Gu;J. Lian;G. Li .Electroless Ni-P plating on AZ91D magnesium alloy from a sulfate solution[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2005(1/2):104-109. |
| [8] | Li GY;Lian JS;Niu LY;Jiang ZH .Investigation of nanocrystalline zinc-nickel alloy coatings in an alkaline zincate bath[J].Surface & Coatings Technology,2005(1):59-67. |
| [9] | Wu FB.;Tien SK.;Chen W.;Duh JG. .Microstructure evaluation and strengthening mechanism of Ni-P-W alloy coatings[J].Surface & Coatings Technology,2004(0):312-316. |
| [10] | Y. Gao;Z.J. Zheng;M. Zhu .Corrosion resistance of electrolessly deposited Ni-P and Ni-W-P alloys with various structures[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2004(1/2):98-103. |
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