Study on Chromium-Free Pretreatment Solution of Color Coated Sheet

Abstract:

Based on the inorganic and organic composite pretreatment technology, a new chromium-free pretreatment solution consisting of Ce (NO₃)₃, N-β (aminoethyl)-γ-aminopropyl trimethoxysilane (KH792) and vinyltrimethoxysilane (KH171) was studied and used to treat galvanized sheet. Corrosion resistance of composite silane films on galvanized sheet surfaces was studied using CuSO₄ pitting corrosion test and neutral salt spray test. Experimental results show that the corrosion resistance of composite silane film has improved significantly, compared to single silane film. The optimal condition of chromium-free pretreatment solution is that KH792/KH171 ratio is 4/1(v/v), Ce (NO₃)₃ content is 0.05%(w/w).

• Periodical: Applied Mechanics and Materials (Volumes 490-491)
• Pages: 104-108
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.490-491.104
• Online since: January 2014
• Authors: Chang Rong Ran, Tai Xiong Guo, Quan Xu, Xue Qiang Dong
• Keywords: Cerium Nitrate, Chromium-Free Pretreatment, Organosilane

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