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Surface Engineering Volume 28, 2012 - Issue 7
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Original Article

Improvement to corrosion resistance of Ni–P coating on MAO magnesium alloy by BTESPT

M-A ChenSchool of Materials Science and Engineering, Central South University, Changsha410083, ChinaCorrespondence[email protected]
,
N ChengSchool of Materials Science and Engineering, Central South University, Changsha410083, China
,
J-M LiSchool of Materials Science and Engineering Xi’an University of Technology, Xi’an710048, China
&
S-Y LiuSchool of Materials Science and Engineering, Central South University, Changsha410083, China
Pages 491-497 | Received 20 Dec 2011, Accepted 01 Apr 2012, Published online: 12 Nov 2013
 
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Abstract

A layer of nickel–phosphorus alloy was electroless plated on the surface of microarc oxidised AZ31 magnesium alloy first, and then sealing treatment was performed on the electroless nickel plated coating using bis-(triethoxysilylpropyl)tetrasulphide silane. Fourier transform infrared spectroscopy, scanning electron microscope (SEM), energy dispersed X-ray spectroscope analyses, electrochemical techniques and immersion test were used for the analyses of surface morphology and structure and corrosion resistance of electroless nickel plated samples before and after sealing treatment. The results showed that the silane film by sealing treatment improves its corrosion resistance significantly.

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