Study of an environment-friendly insulating coating with high corrosion resistance on electrical steel

An Lin; Xian Zhang; Dajing Fang; Miao Yang; Fuxing Gan

doi:10.1108/00035591011087154

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Anti-Corrosion Methods and Materials

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Study of an environment-friendly insulating coating with high corrosion resistance on electrical steel

Document Information:
Title:	Study of an environment-friendly insulating coating with high corrosion resistance on electrical steel
Author(s):	An Lin, (Department of Environmental Engineering, School of Resource and Environmental Science, Wuhan University, Wuhan, China), Xian Zhang, (Department of Environmental Engineering, School of Resource and Environmental Science, Wuhan University, Wuhan, China), Dajing Fang, (Department of Environmental Engineering, School of Resource and Environmental Science, Wuhan University, Wuhan, China), Miao Yang, (Department of Environmental Engineering, School of Resource and Environmental Science, Wuhan University, Wuhan, China), Fuxing Gan, (Department of Environmental Engineering, School of Resource and Environmental Science, Wuhan University, Wuhan, China State Key Laboratory for Corrosion and Protection of Metals, Shenyang, China)
Citation:	An Lin, Xian Zhang, Dajing Fang, Miao Yang, Fuxing Gan, (2010) "Study of an environment-friendly insulating coating with high corrosion resistance on electrical steel", Anti-Corrosion Methods and Materials, Vol. 57 Iss: 6, pp.297 - 304
Keywords:	Coatings technology, Corrosion resistance, Passivation, Salts, Steels
Article type:	Research paper
DOI:	10.1108/00035591011087154 (Permanent URL)
Publisher:	Emerald Group Publishing Limited
Acknowledgements:	An Lin gratefully acknowledges the support and assistance from Professor Fuxing Gan, Professor Huibing Qi, Baokui Ai, Xian Zhang and Dajing Fang, and of Shanghai Bao Steel Group for the provision of samples.
Abstract:	Purpose – The purpose of this paper is to study the corrosion resistance and the insulating characteristics of an environment-friendly chromium-free coating on electrical steel. Design/methodology/approach – A water-based semi-inorganic environment-friendly insulating coating on electrical steel was developed. The coating system of silane coupling agent and rare earth salt were used first in this coating to replace the chromate containing coating. In this study, it provided a successful combination of coating and passivation. Findings – Several test results, such as insulating ability, corrosion resistance, adhesion strength and hardness, showed that the performance of the film complied fully with the industry standards, particularly excellent in its corrosion resistance and the maximum corrosion resistance (neutral salt-spray test) time up to 20?h. Originality/value – There have been few reports on the chromium-free insulating coating on electrical steel, and described in the paper, this environment-friendly insulating coating on electrical steel was found to be highly effective.