An automatic continuous flow electroplating device and method for the inner wall of a pipe fitting

Abstract

The invention belongs to the field of coating preparation by electrodeposition on the inner wall of a pipe, and relates to an automatic continuous flow electroplating device and method for the inner wall of a pipe fitting. The device includes a plating tank, a multi-channel plating solution flow controller, a hanger, a mechanical arm, a rectifier and a display controller. First, the tubular workpiece is clamped on the hanger of the automatic continuous flow plating device after the pretreatment process such as degreasing and pickling; the plating tank is respectively equipped with pure water, activation solution and electroplating solution; by setting the display controller program according to Water washing, activation, electroplating, water washing process, control the cooperative operation of robotic arm, multi-channel plating solution flow controller and electroplating power supply, the above process can be added according to the demand to realize multi-layer composite electroplating. The invention is especially suitable for flow electroplating a single or multi-layer composite coating on the inner wall of a pipe with a large length-to-diameter ratio. Through the device and method of the invention, a coating without taper can be obtained at one time, and the bonding between the substrate and the coating is excellent.

Description

technical field [0001] The invention belongs to the field of electroplating, and relates to an automatic electroplating device and method for the inner wall of a pipe fitting, in particular to a method for obtaining a uniform chrome plating layer by electroplating the inner wall of a pipe fitting with a large aspect ratio. Background technique [0002] Surface coating is an effective material carrier that endows the surface of mechanical products or parts with specific service performance, and plays an important role in the fields of national defense, precision manufacturing, mechanization and chemical engineering. In defense science and technology and general industry, there are a large number of tubular workpieces that need surface treatment. However, the functional coating of the inner surface has always been a technical problem in the field of surface engineering. The deep pipe is a typical slender pipe shaft part with a large aspect ratio. It has the characteristics of ...

AI Technical Summary

Problems solved by technology

The ablation and wear of the deep tube causes damage to the surface of the inner bore and the increase in the size of the inner bore of the deep tube. The direct consequence is the decrease of the bore pressure, muzzle velocity, range, and accuracy, which seriously affects the combat performance and leads to the end of life.

Hard chromium electroplating on the inner bore is an effective way to improve the service life of deep pipes, and it is also the mainstream surface protection technology of deep pipe inner bores at home and abroad. However, hard chromium electroplating has fatal shortcomings, but there are many problems in the current hexavalent chromium plating process: First, the existing The traditional rack plating method is still widely used in the process. Due to the relatively large length and diameter and small aperture, it is difficult to replenish the solution in the tube in time during electroplating, which can easily lead to a decrease in the concentration of the plating solution in the tube, thereby reducing the quality of the coating; second, the rack plating method Power can only be supplied from one end of the pipe fitting, which will cause uneven distribution of current density at both ends of the pipe fitting

This method destroys the continuity in the electroless plating process, increases the steps of disassembly and clamping, and the process is cumbersome

This method will lead to poor bonding of the plating in the field of electroplating

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