There are significant differences between alkaline galvanizing and acidic galvanizing in terms of bath properties, coating characteristics, production efficiency and environmental impact. Alkaline zinc plating uses an alkaline solution with zinc oxide as the main component. Sodium hydroxide, zinc plating additives and stabilizers are usually added to maintain the plating solution environment. The pH value is usually above 12, while acidic zinc plating uses sulfuric acid or zinc hydrochloric acid as the zinc source. The H value is low, usually 4.6. In terms of coating characteristics, alkaline zinc plating can produce fine and uniform coating with good adhesion and high corrosion resistance, while the acid galvanized coating is thin but high brightness, but may be slightly inferior in flexibility and corrosion resistance. In terms of production efficiency, the alkaline galvanizing process is slow and suitable for workpieces that require thicker coatings, while acid galvanizing is suitable for efficient processing of small parts due to the fast growth rate of the coating. In terms of environmental impact, the cyanide-free additives used in alkaline galvanizing are more environmentally friendly and have less burden on the environment, while the acidic plating solution is highly corrosive and requires more stringent waste treatment.