ELECTROCHEMICAL CHARACTERIZATION FOR CORROSION RESISTANCE OF PLASMA-SPRAYED Cr2O3 COATING WITH SEALING

Journal of Chinese Society for Corrosion and protection

2012, Vol. 32

Issue (6): 473-477 DOI:

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ELECTROCHEMICAL CHARACTERIZATION FOR CORROSION RESISTANCE OF PLASMA-SPRAYED Cr₂O₃ COATING WITH SEALING

HOU Yanfeng^1,2, XU Likun², SHEN Chengjin¹, LI Xiangbo²

1. School of Materials Science and Engineering, China University of Mining & Technology, Xuzhou 221116

2. State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Materials Research Institute, Qingdao 266101

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Abstract

Cr₂O₃ coating was deposited on Q235 steel by means of plasma-sprayed technology, which was sealed by aluminum phosphate and epoxy resin respectively. The porosity of the coating was investigated by graph analysis and electrochemical measurement, and the corrosion resistance of the coating was characterized by polarization curve and electrochemical impedance spectroscopy (EIS). It is found that the sealing treatment can elevate corrosion resistance of the Cr₂O₃ coating. Compared with the coating sealed with aluminum phosphate, the epoxy resin-sealed coating shows excellent corrosion resistance. The electrochemical behavior of the Cr₂O₃ coating in the corrosive electrolyte depends mainly on the porosity of the coating.

Key words: 13cmrm plasma spraying Cr₂O₃ coating sealing treatment porosity, electrochemistry

Received: 09 January 2012

ZTFLH:	TG174.442
	TH117.1

Corresponding Authors: Likun Xu E-mail: xulk@sunrui.net

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. ELECTROCHEMICAL CHARACTERIZATION FOR CORROSION RESISTANCE OF PLASMA-SPRAYED Cr₂O₃ COATING WITH SEALING. Journal of Chinese Society for Corrosion and protection, 2012, 32(6): 473-477.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2012/V32/I6/473

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