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《Surface Technology》 2010-03
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Study on the Microstructure and Properties of Electroless Ni-W-P Plating on Aluminium Alloy

YAO Huai1,2,CHANG Qing-hua1,WANG Xi-ran1(1.Henan University of Science and Technology,Luoyang 471003,China;2.Henan Key Laboratory of Non-ferrous Metal Materials Science and Processing,Luoyang 471003,China)  
The ternary Ni-W-P alloy coatings were deposited by electroless plating on aluminium alloy.The microstructure,constituents,organization structure and properties of the coating were investigated using XRD,SEM and DAT.The results show that the substrate is covered of Ni-W-P plating completely,the surface is composed of uniform crystalline grains,brightness and uniformity,the diameter of grains is about 7 μm,the hardness is reach to HV610,the coating is singlephase system and has better corrosion resistance.The crystallization of nickel as well as Ni3P begin to come into being and the maximum hardness of Ni-W-P plating is about HV920 when heated at 380 ℃.When the ambient temperature is high,the deposition of W can prevent the precipitation of Ni3P and delay Ni alloy crystallization process,making Ni-W-P coatings than the Ni-P coatings has better thermal stability.
【CateGory Index】: TQ153.1
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