Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第23卷    第7期    总第172期    2013年7月

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文章编号:1004-0609(2013)07-1819-07
零污水排放镁合金化学镀镍沉积机制及Ni-P镀层的耐蚀性
方信贤,巴志新,甄 睿,王章忠

(南京工程学院 材料工程学院,南京211167)

摘 要: 对传统镁合金化学镀工艺进行改进,分析“零污水排放”化学镀镍新工艺的沉积机制。并以316L不锈钢作为对比材料,研究该化学镀镍层的耐蚀性能。结果表明:新工艺获得的Ni-P镀层具有非晶结构,且组织均匀致密;在20%H2SO4溶液中,镀态和经200 ℃热处理的镀层的耐蚀性均优于316L不锈钢的;Ni-P镀层与316L不锈钢在20%H2SO4溶液中的动电位极化曲线对比表明,Ni-P镀层具有更正的腐蚀电位,可对AZ91D镁合金起到有效的保护作用。氟化镁转化膜在镀液中是稳定的,化学镀后与镀镍层和镁合金基体间的界面结合良好。

 

关键字: 镁合金;化学转化膜;沉积机制;耐蚀性;零污水排放工艺

Deposition mechanism of wastewater-free electroless nickel plating on magnesium alloy and corrosion resistance of Ni-P coating
FANG Xin-xian, BA Zhi-xin, ZHEN Rui, WANG Zhang-zhong

School of Material Engineering, Nanjing Institute of Technology, Nanjing 211167, China

Abstract:Traditional process of electroless Ni-P plating on AZ91D magnesium alloy was improved, and the deposition mechanism of a new wastewater-free electroless nickel plating was investigated. Meantime, the corrosion resistance of the Ni-P coating was studied using stainless steel 316L as contrast material. The results show that the Ni-P coating prepared with the new process is amorphous, and its microstructure is compact and uniform. The corrosion resistance of both as-plated and heat-treated Ni-P coating at 200 ℃ is superior to that of stainless steel 316L in 20%H2SO4 solution. The potentiodynamic polarization curves in 20%H2SO4 solution indicate that the Ni-P coating has more positive corrosion potential than that of stainless steel 316L, and can provide good protection to magnesium alloy substrate. The MgF2 conversion film on the surface of magnesium alloy is stable in the bath. Good interface coherences, both in Ni-P coating-MgF2 film and in magnesium alloy matrix-MgF2 film, are formed.

 

Key words: magnesium alloy; chemical conversion film; deposition mechanism; corrosion resistance; wastewater-free process

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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