Analysis and control of hot-dip galvanizing with shedding chrome-free passivation
YU Huai-bin1,ZHAO Yun-long2
1. Materials Company, Ma’anshan Iron and Steel Co., Ltd., Ma’anshan 243000, Anhui, China 2.Technical Center, Ma’anshan Iron and Steel Co., Ltd., Ma’anshan 243000, Anhui, China
Abstract:Hot-dip galvanized steel panel (HDG) treated with chrome-free passivation, which lead to coating shedding and bad adhesion problem after cleaning. The analytical characteristic of substrates was made by the coating weight test, neutral salt spray test, infrared spectrum analysis, energy spectrum analysis, glow (GDS) analysis and scanning electron microscopy (SEM).The results showed that coating shedding is due to not fully volatilizes of moisture in the production process, which blocks the film aging and excessive swelling occurs when it is in the high humidity condition. Through adjusting and optimizing production process, making the film fully cured, which improved the adaptability of chromium-free passivation agent and production equipment, successfully solved the problem and met the demand.
于怀彬,赵云龙. 热镀锌无铬钝化膜脱落的分析与控制[J]. 中国冶金, 2014, 24(12): 27-31.
YU Huai-bin,ZHAO Yun-long. Analysis and control of hot-dip galvanizing with shedding chrome-free passivation. China Metallurgy, 2014, 24(12): 27-31.