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PREPARATION AND CORROSION RESISTANCE OF COPPER MULTILAYER COATING OBTAINED BY ULTRASONIC-ELECTRODEPOSITION |
CUI Ronghong1,2, YU Zhiming2, HE Yuting1, SHU Wenjun1, DU Jinqiang1, NIU Yunsong2 |
1. Engineering College, Air Force Engineering University, Xi'an 710038
2. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 |
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Abstract Copper multilayer coating was obtained by ultrasonic-electrodeposition method. SEM, XRD technology, mass loss measurement and anodic polarization curves were employed to study its metallurgical structure and corrosion resistance performance. The results show that the layer thickness of it is about 0.3 μm, and the microstructure of it is much more compact. The XRD analysis results show that its texture coefficients of (200) and (111) are obviously improved, while the (220) texture coefficient is much weaker. The average bubbling time of it in 20% HNO3 solution is about 380 s, nearly three times longer than that (148 s) of the ordinary electrodeposited copper coating sample, and the corrosion rate is obviously decreased, Anode polarization curves in 3.5% NaCl solution show that the corrosion potential of it is higher, and the corrosion current of it is less than 1/5 of that of ordinary electrodeposited copper coating, which means the corrosion resistance is greatly improved.
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Received: 05 March 2010
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Corresponding Authors:
HE Yuting
E-mail: hyt666@tom.com
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