期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 391, 期 1-2, 页码 104-109出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2004.07.083
关键词
surfaces and interfaces; electrochemical reaction; metals; X-ray diffraction
Direct electroless Ni-P plating on the AZ91D magnesium alloy from a plating bath containing sulfate nickel was investigated in the paper. The nucleation mechanism of Ni-P deposits on the AZ91D magnesium alloy was studied by using XRD and SEM. The electroless Ni-P deposits were preferentially nucleated on the beta-Mg17Al12, phase and extended to the primary and eutectic a phases of the AZ91D magnesium alloy. The effect of the acid pickle treatment time of the AZ91D magnesium alloy substrate on the electroless Ni-P plating was also investigated. With prolonging the acid pickle treatment time, the cluster of electroless Ni-P deposition became smaller and the deposits were found to be more compact. The deposition rate of electroless Ni-P plating was proportional to the acid pickle treatment time. The hardness values of the Ni-P coatings were about 660 VHN and were not influenced by the pretreatments. (c) 2004 Elsevier B.V. All rights reserved.
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