The invention discloses a method for preventing an
electrochromism product from skip plating and hard spots. The method comprises the steps of oil removing, coarsening, recovering, reducing at two times, activating with
palladium, peptizing, plating of chemical
nickel,
copper pre-plating,
copper plating, activating with acid, semi-bright
nickel plating, bright
nickel plating, nickel sealing,
chromium plating, reducing,
ultraviolet sterilizing, wind shearing, and
drying, wherein washing is performed between every adjacent two processes; when activating with
palladium,
palladium activating liquid with high
tin concentration or palladium activating liquid with low
tin concentration is added to a palladium activating bath to control the concentration of
tin ions to be 1.2 to 1.8g / L. The invention also provides a method for controlling the concentration of tin ions in the
electroplating process. The method is characterized in that two kinds of palladium activating liquid are utilized for effectively adjusting to control the tin
ion concentration to be within the optimal range of 1.2 to 1.8g / L, additionally, the content of palladium can also be supplemented, and thus the activating with palladium is effectively promoted, and as a result, the
electroplating quality of the product is ensured, and the product is also prevented from skip plating and hard spots.