TY - JOUR
T1 - Microstructure and corrosion resistance of plasma sprayed Fe-based alloy coating as an alternative to hard chromium
AU - Lu, Wenhuan
AU - Wu, Yuping
AU - Zhang, Jingjing
AU - Hong, Sheng
AU - Zhang, Jianfeng
AU - Li, Gaiye
N1 - Funding Information:
The research was supported by the Innovation Foundation of Hohai University, China Postdoctoral Science Foundation (No. 20100471371) and the Fundamental Research Funds for the Central Universities (No. 2009B16314). The authors wish to thank Master XiuyinYin and Master Long Lin for assistance in experimental work.
PY - 2011/9
Y1 - 2011/9
N2 - Fe-based alloy coating (FAC) was prepared from Fe-based amorphous metallic powders on low-carbon steel by plasma spray. The microstructures and corrosion resistances (salt spray and electrochemical tests) of the FAC and the reference hard chromium coatings (HCC) were investigated. The results indicated that the as-sprayed FAC consisted of amorphous phase, nanocrystalline grains, and borides. Both the FAC and HCC adhered well to the low-carbon steel substrate, but there are micro-cracks and pores located in FAC, which disappeared after the sealing treatment. After 60 days (1440 h) of corrosion tests by salt spray, the weight loss of FAC was about 10% of the HCC, but that of the sealed FAC (SFAC) was only about 4% of HCC. The electrochemical tests indicated that the HCC had the lowest E corr (-629 mV) and highest I corr (63.2 mA/m 2). Correspondingly, the SFAC possessed the highest E corr (-321 mV) and lowest I corr (6.97 mA/m 2). These suggested that the resistance to corrosion sequence (R) among these coatings was R SFAC > R FAC > R HCC. Therefore, this Fe-based alloy coating could be applied as a good alternative material to hard chromium in corrosion environments.
AB - Fe-based alloy coating (FAC) was prepared from Fe-based amorphous metallic powders on low-carbon steel by plasma spray. The microstructures and corrosion resistances (salt spray and electrochemical tests) of the FAC and the reference hard chromium coatings (HCC) were investigated. The results indicated that the as-sprayed FAC consisted of amorphous phase, nanocrystalline grains, and borides. Both the FAC and HCC adhered well to the low-carbon steel substrate, but there are micro-cracks and pores located in FAC, which disappeared after the sealing treatment. After 60 days (1440 h) of corrosion tests by salt spray, the weight loss of FAC was about 10% of the HCC, but that of the sealed FAC (SFAC) was only about 4% of HCC. The electrochemical tests indicated that the HCC had the lowest E corr (-629 mV) and highest I corr (63.2 mA/m 2). Correspondingly, the SFAC possessed the highest E corr (-321 mV) and lowest I corr (6.97 mA/m 2). These suggested that the resistance to corrosion sequence (R) among these coatings was R SFAC > R FAC > R HCC. Therefore, this Fe-based alloy coating could be applied as a good alternative material to hard chromium in corrosion environments.
KW - electrochemical corrosion test
KW - hard chromium coating
KW - plasma spray
KW - salt spray test
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U2 - 10.1007/s11666-010-9611-z
DO - 10.1007/s11666-010-9611-z
M3 - Review article
AN - SCOPUS:80053371288
VL - 20
SP - 1063
EP - 1070
JO - Journal of Thermal Spray Technology
JF - Journal of Thermal Spray Technology
SN - 1059-9630
IS - 5
ER -