Electrochemical treatment auxiliary electrode and use method

Abstract

The invention relates to an electrochemical treatment auxiliary electrode and a use method. The auxiliary electrode comprises a conductive clamp and a contact head, a conductive wire of the contact head is coated in an insulating sleeve, the tail end of the contact head electrically connects the conductive wire with the conductive clamp through a flexible lead, and the insulating sleeve at the front end of the contact head is provided with a plurality of through holes penetrating through the insulating sleeve. The auxiliary electrode is used as an auxiliary anode and is close to the surface of a workpiece so as to improve the current density of a local area, so that the crystal nucleation capability of a plating layer is improved, and the current density required by the deposition of the plating layer can be obtained at the bottom of a groove, a bottom foot, a hole and the inner surface of a cavity of the workpiece or the current density of the center part of a larger plane is improved, so that the coverage degree and the thickness uniformity of the plating layer are improved; and when being used for anodic oxidation of light alloy such as aluminum and aluminum alloy, the auxiliary electrode serves as an auxiliary cathode and is close to the surface of a workpiece, so that the current density of a local low-electric-field-intensity area is improved, the capacity of forming an oxidation film layer is improved, and the coverage degree and the thickness uniformity of the oxidation film layer are improved.

Description

technical field [0001] This application relates to manufacturing technology, and further to electrochemical surface treatment of workpieces, specifically an auxiliary electrode for electrochemical treatment and its use method. Background technique [0002] Electroplating is a commonly used electrochemical surface treatment method. Its process is an electrochemical process in which the workpiece to be plated is used as a cathode so that metal ions in a conductive solution obtain electrons and convert them into a plating layer. Get qualified coating. To obtain a coating that meets the requirements, the surface to be plated must have sufficient current density to achieve the ability of the crystal nucleation of the coating, and the size of the current density depends on the strength of the electric field on the surface to be plated. During electroplating, only when the surface to be plated is provided with an appropriate current density, can a qualified coating be obtained, an...

AI Technical Summary

Problems solved by technology

This method will not only sacrifice the quality requirements of the coating or oxide film layer at the contact point of the tooling, but also consider the conductivity, cleaning after each process, and the fluidity of the solution to achieve reasonable electrical conductivity, heat transfer, and mass transfer. inconvenient

Images