What is the difference between die casting (zinc alloy, aluminum casting) and sheet metal parts when spraying powder? What should I pay attention to? Urgent!

sheet metal parts are generally made of plates, which are made of better materials, with fewer general influencing factors, less general problems in pre-treatment, and poor materials of die-casting parts. Powder spraying and die-casting quality of blank parts (mold release agent, surface porosity, porosity, molding, uniform composition, shrinkage, etc.), polishing quality and pre-treatment quality will have great influence on powder spraying, and there are many influencing factors, which are difficult to do. Pay attention to powder spraying of die-casting parts.