An electroplating method for improving the uniformity of the thickness of the cadmium-plated coating on the basket

Abstract

The invention provides an electroplating method capable of improving the thickness uniformity of a basket plating cadmium coating. The method is suitable for cadmium electroplating machining of steel materials. The method comprises the steps that before a part is electroplated, the part is measured, and the basket plating area S1 and a part total area S2 are calculated; according to a formula of I=(3SI+S2)*J, the total construction current capable of ensuring the effective electroplating current of the part is prejudged; the power-on current of a plating tank is calculated; and a plating tank solution comprises 35g / L to 45g / L of CdO, 120g / L to 140g / L of NaCN, 15g / L to 25g / L of NaOH, 35g / L to 50g / L of NaSO4 10H2O, and 1g / L to 2g / L of NiSO4 7H2O. The coating prepared through the method is smooth in appearance, fine in grain, uniform, dedicate and glossy or shine. Roughing, scorching, hard spots, black spots, blistering and falling off are avoided. The coating is uniform and controllable in thickness, the difference between the actual thickness of the coating and the expected thickness does not exceed 5%, the electroplating quality requirement is met, and the thickness design requirement is also met.

Description

technical field [0001] The invention relates to an electroplating method for cadmium plating of baskets, which is suitable for electroplating cadmium processing of steel materials. Background technique [0002] Electroplating processing is usually divided into three types: rack plating, basket plating and barrel plating. For small workpieces and standard parts, basket plating is usually used to achieve plating. The material selection of the plating basket is the same as that of the rack plating, and most of them are made of pure copper to improve the conductivity during the plating process. [0003] Before electroplating, it is necessary to calculate the current density required for electroplating according to the total area of ​​the workpiece in the electroplating tank, so as to ensure the coating thickness of the workpiece. However, because the plating basket itself will disperse and shield the current, the actual current of the workpiece during electroplating is much sma...

AI Technical Summary

Problems solved by technology

If the electroplating is performed simply according to the current density of the workpiece calculated in advance, the thickness of the coating will be too small or there will be no coating.