Fabrication and corrosion resistance of Ni-P duplex layer coating

被引：0

作者：

Fan X. ^{[1
]}

Zhang H. ^{[1
]}

Hao J. ^{[2
]}

Kuang L. ^{[1
]}

Wang J. ^{[1
]}

机构：

[1] The Key Laboratory of Advanced Technologies of Materials, Southwest Jiaotong University

[2] Foundation Construct Department, Petro China Jilin Oilfield Company

来源：

Xinan Jiaotong Daxue Xuebao/Journal of Southwest Jiaotong University | 2010年 / 45卷 / 03期

关键词：

Corrosion resistance; Duplex layer coating; Ni-P alloy;

D O I：

10.3969/j.issn.0258-2724.2010.03.012

中图分类号：

学科分类号：

摘要：

Three different coatings were prepared with different complexing agents and electroless plating procedures. The composition, microstructure and morphology of the coatings were characterized by X-ray diffractometer (XRD), X-ray energy dispersive spectrometer (EDS)and scanning electron microscope (SEM). The corrosion resistances and corrosion potentials of the coatings were measured chemically and chemicoelectrically, respectively. The results demonstrated that the composition and electroless plating procedure significantly affected phosphorus concentration and microstructure of the coating, but no obvious trends were observed. As the increase in phosphorus concentration in the coatings, their microstructures changed from crystalline to crystalline and amorphous states, and finally to amorphous state, causing the self-corrosion potential and current of the coating to increase and decrease, respectively. The best corrosion resistance appeared when the outer layer had a low potential (-550 mV) and the inner layer a high potential (-295 mV), and the thickness of the inner layer was twice as that of the outer one.

引用

页码：389 / 392+429

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