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| STRUCTURE AND CORROSION RESISTANCE OF ELECTROLESS PLATING Ni-P AND Ni-W-P COATINGS ON AZ91D MAGNESIUM ALLOY |
| LI Duanyang1, SHEN Bo1, REN Yuping1, PEI Wenli1,YANG Zhongdong1, WANG Jijie2, QIN Gaowu1 |
1. College of Materials and Metallurgy, Northeastern University，Shenyang 110819
2. School of Materials Science and Engineering, Shenyang University of Aeronauitical and Astronautics, Shenyang 110136 |
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Abstract 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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Received: 19 December 2008
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Corresponding Authors:
QIN Gaowu
E-mail: qingw@smm.neu.edu.cn
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