Surface repairing method of electrochemical micro additive

Abstract

The invention relates to a surface repairing method of an electrochemical micro additive. The surface repairing method comprises the following steps of: pasting a photosensitive dry film on the surface of a clean and dry cathode workpiece, manufacturing a mask negative film matched with a non-repairing area in shape, placing the mask negative film on the surface of the photosensitive dry film of the non-repairing area, then exposing the cathode workpiece, curing a photosensitive part of the non-repairing area of the cathode workpiece to form a firm and insulated protective film, dissolving thephotosensitive dry film of a non-photosensitive part of a repairing area of the exposed cathode workpiece in a developing solution, and exposing metal of a to-be-repaired area; enabling an anode toolto be in contact with the metal of the to-be-repaired area under certain pressure; continuously injecting an electrolyte between the anode tool and the cathode workpiece at a certain flow rate, and carrying out electrochemical repairing of the micro additive on the to-be-repaired area of the cathode workpiece; after repairing, removing the insulated protective film on the surface of the workpiece; and finally, carrying out heat treatment on the surface of the repairing area of the workpiece to obtain a pre-deposited repairing layer with the thickness of 0.2-10 microns.

Description

Technical field [0001] The invention relates to the technical field of electrochemical processing, in particular to a method for electrochemical micro-additive repair on the surface of a superalloy. Background technique [0002] With the large number of advanced aircraft and engines in service, typical key parts of advanced aircraft such as blades, axles, wings, etc. or advanced airborne equipment components during long-term use, due to various mechanical and chemical effects, some metal parts will change from Partial surface failures begin to occur locally. Firstly, micro-cracks, pits, abrasion and local corrosion with a smaller size of less than 0.2mm are generated. If not repaired in time, they will slowly grow into fatigue cracks, and they will grow from the surface of the part. Extending inward, eventually causing parts to fail and huge losses. Therefore, in the use and maintenance work, how to improve the surface quality of the parts and reduce the maintenance cost is an u...

AI Technical Summary

Problems solved by technology

[0008] In order to solve the deficiencies of the prior art, the present invention provides a surface repair method of electrochemical micro-addition, which can be used to repair the surface of superalloys, and realizes precise localization by performing mask treatment on the shape of micro-defects on the surface to be repaired Repair, which solves the problems of poor reproducibility of existing repair methods and difficulty in controlling the quality of the repair layer

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