COLORED GALVANIZING PROCESS AND CORROSION RESISTANCE OF THE GALVANIZED COATINGS

J Chin Soc Corr Pro

1996, Vol. 16

Issue (3): 219-224 DOI:

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COLORED GALVANIZING PROCESS AND CORROSION RESISTANCE OF THE GALVANIZED COATINGS

CHEN Jinhong; LU Jintang; XU Qiaoyu ZENG Guangliang; LI Guoxiong; XIE Jun (South China University of Technology)

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Abstract The process of colored hot dip galvanizing and the corrosion resistance of the galvanized coatings were studied. Two types of melted zinc alloy bath (Zn-Mn-Cu) were developed for producing smooth, uniform and gaily-colored coatings.The golden, purple, blue and iridescent coatings were obtained at proper bath temperature and under suitable cooling conditions.Higher bath temperature and longer cooling time in air before quenching in water would thicken the oxide film on coatings, which resulted in changing the color of the Zn-Ti-Ni coating from golden to purple and blue, but with little effect on the iridescent color of the Zn-Mn-Cu coating. The salt spray tests showed that the colored galvanized coatings had excellent corrosion resistance, and their corrosion weight loss was only half of that for the conventional galvanized coatings. In addition, the colored coatings provided better adhesion to paint.

Key words: Colored hot dip galvanizing Corrosion resistance Paint adhesion

Received: 25 June 1996

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CHEN Jinhong; LU Jintang; XU Qiaoyu ZENG Guangliang; LI Guoxiong; XIE Jun (South China University of Technology). COLORED GALVANIZING PROCESS AND CORROSION RESISTANCE OF THE GALVANIZED COATINGS. J Chin Soc Corr Pro, 1996, 16(3): 219-224.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1996/V16/I3/219

1YamanlotoTEPPat．,0269005A2,1987-11-192YamamotoTEPPat．,0269006A2、1987-11-193YamamotoTUSPat．,5022937,1991-06-114邓仁江．热浸镀锌杂志(台),1990;(12)5朝野秀次郎．制铁研究,1981,(304):102-1196EvansUR著,华保定译．金属的腐蚀与氧化,北京:机械工业出版社,1976．

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