Electroless Nickel-plating on AZ91D Magnesium Alloy by Using NiSO<sub>4</sub>·6H<sub>2</sub>O as Main Salt

Jia Suqiu; Yu Shumin; Su Yiduo

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Electroless Nickel-plating on AZ91D Magnesium Alloy by Using NiSO₄·6H₂O as Main Salt
Vol. 29, Issue 12, Pages: 1102-1104(2009)
Published： 2009 ，
DOI：

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[1]贾素秋,于淑敏,苏一多.以硫酸镍为主盐的AZ91D镁合金化学镀镍研究[J].特种铸造及有色合金,2009,29(12):1102-1104+1073.

Jia Suqiu, Yu Shumin, Su Yiduo. Electroless Nickel-plating on AZ91D Magnesium Alloy by Using NiSO₄·6H₂O as Main Salt. [J]. Special Casting & Nonferrous Alloys 29(12):1102-1104(2009)
[1]贾素秋,于淑敏,苏一多.以硫酸镍为主盐的AZ91D镁合金化学镀镍研究[J].特种铸造及有色合金,2009,29(12):1102-1104+1073. DOI：

Jia Suqiu, Yu Shumin, Su Yiduo. Electroless Nickel-plating on AZ91D Magnesium Alloy by Using NiSO₄·6H₂O as Main Salt. [J]. Special Casting & Nonferrous Alloys 29(12):1102-1104(2009) DOI：

摘要

研究了以硫酸镍为主盐的AZ91D镁合金化学镀镍。采用无铬前处理在AZ91D镁合金表面形成高锰酸盐和磷酸盐化学转化膜

用SEM、EDX、XRD和极化曲线等方法研究化学转化膜和化学镀镍层的形貌、组成及在3.5%的NaCl溶液中的耐腐蚀性能。结果表明

在高锰酸盐转化膜表面形成的化学镀镍层呈胞状

较致密

有微裂纹;在磷酸盐转化膜上形成的化学镀镍层也呈胞状

晶胞大小不均匀

没有微裂纹。镀层厚度均匀

致密

无孔隙。在3.5%的NaCl溶液中的极化曲线表明化学转化膜对镁合金基体的耐腐蚀性能提高不大

经高锰酸盐和磷酸盐前处理的化学镀镍层腐蚀电位分别为-0.48VSCE和-1.12VSCE。以硫酸镍为主盐的经磷酸盐前处理的化学镀镍层较好地提高了镁合金的耐腐蚀性能。

Abstract

Electroless nickel-plating on AZ91D magnesium alloy by using NiSO4·6H2O as main salt was described.Permanganate and phosphate chemical conversion films were proposed as the chrome-free pretreatment layer between electroless nickel-plating and AZ91D magnesium alloy substrate.Morphology

composition and corrosion resistance of the chemical conversion film and electroless nickel-plating layer in 3.5%NaCl solution were determined by SEM

EDX

XRD and polarization curve.The results show that the electroless nickel-plating coating after permanganate pretreatment exhibits cell structure with sound to some extent and micro-crack

while one after phosphate pretreatment also exhibits cell structure with uneven grain size and micro-crack free

and plating coating shows uniform thickness with compact structure and pore-free.Corrosion resistance is slightly improved by chemical conversion treatment compared with that of magnesium substrate

and corrosion potential of electroless nickel-plating coating after permanganate pretreatment and phosphate pretreatment reach-0.48Vsce and-1.12Vsce

respectively

in 3.5%NaCl solution by polarization curves.Corrosion resistance of AZ91D magnesium alloy is improved by electroless nickel-plating layers after phosphate pretreatment with NiSO4·6H2O as main salt.