Weigh 80kg of pure water, 20kg of pure sulfuric acid, and 2kg of pure stannous sulfate, and prepare 20ml of brightener, 3ml of additives, and 5ml of JH stabilizer respectively (the latter three are purchased from the hardware market and are required to be tin-plated Just use it. Generally, brighteners mostly use C10H10O, benzylidene acetone). Add sulfuric acid to 80kg of pure water. After natural cooling, add the above-mentioned brighteners, additives and stabilizers in sequence to prepare a plating solution.