以家用炒菜铁锅(Q235薄钢板冲压件或灰口铸铁锅)外侧单面热浸镀铝为例,介绍了钢铁件局部热浸镀铝工艺。阐述了铁锅热浸镀铝的原理与难点,分析了镀层的组织形态,给出了适用于钢铁件局部热浸镀铝的阻镀剂配方以及端部带螺纹钢管局部镀铝的操作步骤,推荐采用无熔盐覆盖法(即使用氟铝酸钠)以避免铝液表面熔盐对镀铝的妨碍。 Taking the single side hot dip aluminizing on the outside of domestic cooking wok (Q235 sheet steel stamping or gray cast iron pot) as an example, the local hot dip aluminizing process for steel parts is introduced. The principle and difficulty of hot-dip aluminizing in wok are expounded. The microstructure of the coating is analyzed. The formula of plating resist suitable for local hot-dip aluminizing of steel parts and the operation steps of partial aluminizing of threaded steel tube in the end are given. It is recommended to use a non-molten salt coverage method (ie, use sodium fluoroaluminate) to avoid the molten salt on the molten aluminum on the aluminum barrier.