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| PRETREATMENT FOR ELECTROPLATING OF MAGNESIUM ALLOY |
| WANG Bumei1;XUE Feng1;2;SUN Yangshan1;2;JIA Chunping1;TAO Weijian2 |
1.School of Materials Science and Engineering;Southeast University;Nanjing 211189
2.Jiangsu Magnesium Alloy Center of Engineering and Technology;Nanjing 211221 |
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Abstract The pretreatment techniques for AZ31 magnesium alloy has been studied by methods such as SEM, weight loss test and so on in this paper. The results show that the sample has bright surface and no weight loss after acid pickling in the solution of CrO3+Fe(NO3)3+KF. Oxide can be removed effectively after activation in the solution of H3PO4+NH4HF, while adhesion ability of latter zinc immersion coating to substrate can be enhanced. A consistant and adherent coating by sulfate zinc immersion can be obtained. By researching the effect of temperature, current density and pH on the zinc immersion coating, the optimistic zinc immersion technique was determined, which is 30 g/L ZnSO4?7H2O, 150 g/L K4P2O710H2O, 7 g/L KF, 5 g/L Na2CO3, T=70℃～75 ℃, pH=10.2～10.4, t=10 min. The adhesion of coating to the substrate is excellent after zinc electroplating after pretreatment.
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Received: 02 April 2007
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Corresponding Authors:
XUE Feng
E-mail: xuefeng@seu.edu.cn
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