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Study chromium free passivation coating on hot dip galvanized steel sheet

XU ZHEFENG1,2, LIU SHAN3, GAN GUOYOU1,* , YI JIANHONG4

Affiliation

  1. Faculty of Materials Science and Engineering , Kunming University of Science and Technology , Kunming 650093 , China
  2. PanGang Group Research Institute Co., Ltd. Ltd., State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000, Sichuan, China
  3. Department of Biological and Chemical Engineering, Panzhihua University, 617000, Panzhihua, China
  4. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China

Abstract

The chromic acid is often used on the metal surface treatment, but hexavalent chromium was considered as a carcinogen. In order to develop environmentally friendly coating to replace chromating coating, A Tannic Acid H 2 TiF 6 /KH792 silane coupling agent composit e coating was prepared on hot dip galvanized steel sheet to investigate the effect of such as PMT, pH and film thickness. The results showed on the coating structure and the corrosion resistance that PMT and film thickness has greater effect on the corrosi on resistance, and the optimum operation condition is at pH = 4 and in the PMT range of 60 80 degree centigrade. The shows excellent corrosion resistance, anti fingerprint property and paint ability..

Keywords

Hot-dip, Galvanized Steel sheet, Anti-corrosion property, Environmentally protective coating.

Citation

XU ZHEFENG, LIU SHAN, GAN GUOYOU, YI JIANHONG, Study chromium free passivation coating on hot dip galvanized steel sheet, Optoelectronics and Advanced Materials - Rapid Communications, 9, 1-2, January-February 2015, pp.260-265 (2015).

Submitted at: Oct. 22, 2014

Accepted at: Jan. 21, 2015