Device and method for achieving uniformity of electroless nickel plating layer

Abstract

The invention relates to a device and method for achieving the uniformity of an electroless nickel plating layer. The device comprises an electroless nickel plating tank, an automatic chemical addingapparatus is arranged on the outer side of the electroless nickel plating tank, a chemical adding tube of the automatic chemical adding apparatus is arranged on the side wall of the electroless nickelplating tank, and a stirrer is arranged in the electroless nickel plating tank. The method includes the following steps that 1, after the electroless nickel plating tank prepares a plating solution,the stirrer is started and a filter pump is started; 2, the tank wall of the electroless nickel plating tank is provided with an anode protection device; 3, a work piece is fed into the work area of the electroless nickel plating tank, nickel plating is started, and at the same time, the automatic chemical adding apparatus is started to maintain the concentration of the main salt of the bath solution. The device and method can provide the uniformity of the temperature and concentration in the electroless nickel plating tank so that the concentration of each component of the electroless nickelplating solution can be maintained in the normal process range, thus the uniformity of the electroless nickel plating layer is achieved.

Description

technical field [0001] The invention relates to the field of electroless nickel plating, in particular to a device and method for realizing the uniformity of the electroless nickel plating layer. Background technique [0002] Electroless nickel plating is a process in which a Ni-P or Ni-B composite coating is deposited on the surface of the workpiece through an autocatalytic oxidation-reduction reaction using the electroless nickel plating method. This process is different from displacement plating in that the coating can be continuously thickened. During the process of continuous thickening of the coating, due to the uneven concentration of nickel ions in the electroless nickel plating bath, the nickel ions will be unevenly attached to the workpiece. Surfaces thus have an impact on product quality. In addition, the nickel ions in the electroless nickel plating tank are continuously consumed. When the concentration of nickel ions is lower than a certain level, the self-cata...

AI Technical Summary

Problems solved by technology

This process is different from displacement plating in that the coating can be continuously thickened. During the process of continuous thickening of the coating, due to the uneven concentration of nickel ions in the electroless nickel plating bath, the nickel ions will be unevenly attached to the workpiece. Surfaces thus have an impact on product quality

In addition, the nickel ions in the electroless nickel plating tank are continuously consumed. When the concentration of nickel ions is lower than a certain level, the self-catalyzed redox reaction proceeds slowly, and the thickness and uniformity of the nickel plating layer on the surface of the workpiece will be affected.

In addition, the inhomogeneous temperature of the plating solution also affects the uniformity of the nickel plating layer. On the other hand, the nickel ions in the electroless nickel plating tank will continue to crystallize and adhere to the tank wall, which will also affect the concentration of nickel ions in the electroless nickel plating tank. influences

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