Immersion member for hot dip galvanizing bath and method for...

Details Immersion member for hot dip galvanizing bath and method for... Immersion member for hot dip galvanizing bath and method for...

B - Operations, Transporting

05

C

117/112, 117/53,

B05C 3/00 (2006.01) B05C 21/00 (2006.01) C23C 2/00 (2006.01) C23C 4/06 (2006.01) C23C 4/18 (2006.01)

Patent

CA 2002184

ABSTRACT A flame-sprayed layer comprising 1.0 to 1.5% by weight of C, 2.0 to 4.0% by weight of B, 2.0 to 4.0% by weight of Si, 1.0 to 6.0% by weight of Fe, 10.0 to 16.0% by weight of W, 5.0 to 21.0% by weight of Cr and 10.0 to 15.0% by weight of Ni, with the balance being Co, is formed on the surface of an immersion member for a hot dip galvanizing bath. This surface layer has improved corrosion resistance and abrasion resistance and an excellent peeling resistance (adhesion), and the life of the immersion member is prolonged and a galvanization product having a uniform quality and having no flaws can be prepared by using an immersion member having this flame-sprayed surface layer. These effects are enhanced when the formed flame-sprayed layer is heated at a temperature-elevating rate of 10 to 100°C/hr and maintained at a pre-heating temperature of 300 to 600°C for at least 0.5 hour, the fusing treatment is conducted at a temperature of at least 1000°DC for up to 30 minutes once or twice, the temperature is dropped, a soaking treatment is carried out at 500 to 800°C for at least 1 hour and a cooling treatment is then carried out at a temperature-dropping rate of 10 to 50°C/hr.

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