Corrosion behaviour of HVOF-sprayed Co-Cr-W-C coating in NaCl solution

被引：6

作者：

Verdian, M. M. ^{[1
]}

机构：

[1] Islamic Azad Univ, Najafabad Branch, Dept Mat Engn, Adv Mat Res Ctr, Daneshgah Blvd, Najafabad 8514143131, Isfahan, Iran

来源：

TRANSACTIONS OF THE INSTITUTE OF METAL FINISHING | 2018年 / 96卷 / 04期

关键词：

Stellite; coating; HVOF; corrosion; NaCl; PASSIVE FILM; LASER CLAD; STELLITE; MICROSTRUCTURE; RESISTANCE; EROSION; TRIBOCORROSION; POROSITY;

D O I：

10.1080/00202967.2018.1475932

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Stellite 6 (Co-Cr-W-C) coating was deposited on carbon steel substrate by high-velocity oxyfuel spraying. The electrochemical corrosion behaviour of the coatings was investigated in 3.5% NaCl solutions at 25 degrees C by means of polarisation studies and electrochemical impedance spectroscopy (EIS) measurements. The immersion time before corrosion tests was 0.5 and 24 h. The results showed that the corrosion rate of the coatings was lower than that of the steel substrate by one order of magnitude. An active-passive behaviour was observed during anodic polarisation of the coatings at both immersion times. The degree of substrate attack after polarisation tests of coated samples was not considerable. EIS measurement showed that two-time constants were observed in Nyquist plots of the coatings.

引用

页码：206 / 211

页数：6

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