期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 623, 期 -, 页码 274-281出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.10.130
关键词
Ag ion activation; Electroless nickel plating; Micro-arc oxidation; Mg alloy; Corrosion resistance
资金
- National Natural Science Foundation [21176061]
- Key Natural Science Foundation [12JJ2006]
- Construct Program of Key Disciplines in Hunan Province
In this paper, a novel palladium-free and environmentally friendly surface activation process for electroless Ni plating on micro-arc oxidation (MAO) film of AZ91D Mg alloy was studied. A tight, dense and continuous structure of Ni-B/Ni-P coating was obtained on micro-arc oxidation film of AZ91D Mg alloy followed by an immersion into silver ion ink activation solution. Compared with bare AZ91D magnesium alloy, the corrosion potential of the composite coating increased by 1.2 V, while the corrosion current density decreased by two orders of magnitude. Electrochemical impedance spectroscopy (EIS) results showed that the corrosion resistance of AZ91D magnesium alloy was significantly improved by the composite coating. The MAO film as an intermediate layer could reduce the galvanic corrosion between Ni and Mg substrate in 3.5 wt.% NaCl solution. This novel method is a simple, acid-free and cost effective activation process for a replacement of Pd activation method in electroless plating Ni process. (C) 2014 Elsevier B.V. All rights reserved.
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