| 摘要 |
PURPOSE:To obtain economically a homogeneous Zn-Al alloy layer with no defect on the surface of copper by hot dipping by carrying out coating as surface preparation before the hot dipping. CONSTITUTION:A copper bar as a material to be hot dipped is immersed in a trichlene degreasing vessel, air-dried, dipped in concd. hydrochloric acid, and washed. The bar is further dipped in a flux treatment vessel contg. A ZnCl2+ NH4Cl soln. to stick the flux, and it is dried with hot air to remove water. The bar is then dipped in a molten Zn bath, and it is dipped in a molten Zn-Al alloy bath before solidifying the Zn underlayer or after solidifying it and carrying out pretreatment such as flux treatment again. Thus, the desired Zn-Al layer is obtd. |
