Method for preparing corrosion and abrasion resisting coating through supersonic electric arc spraying

Abstract

The invention discloses a method for preparing a corrosion and abrasion resisting coating through supersonic electric arc spraying. The method comprises the following steps that a matrix is subjected to surface roughening, and impurities on the surface of the matrix are removed; a surface roughness tester is used for carrying out quality inspection on a sprayed part of the matrix; an abrasion-proof material such as monel alloy or cobalt-gold alloy or nickel-tungsten alloy or a composite hard material is selected; supersonic electric arc spraying is carried out on the sprayed part of the matrix to prepare the metal coating, wherein the spraying speed ranges from 300 m / s to 400 m / s; and low surface energy matter is sprayed on the coating, drying is carried out at the temperature ranging from 800 DEG C to 1,200 DEG C, and the corrosion and abrasion resisting coating is prepared, wherein the hardness of the coating is HV397, the coating is of a layer texture structure, the void ratio of the coating ranges from 0.9% to 2.3%, and the average particle size of spraying particles is 4.32 micrometers. The obtained coating is better in bonding strength, lower in void ratio, more uniform in compactness, free of deformation of the sprayed matrix and very high in corrosion and abrasion resistance.

Description

technical field [0001] The invention relates to a method for preparing an anti-corrosion and wear-resistant coating by electric arc spraying, in particular to a method for preparing an anti-corrosion and wear-resistant coating by supersonic arc spraying, which belongs to the technical field of electric arc spraying. Background technique [0002] At present, supersonic arc spraying is to use the arc generated by the instantaneous short circuit of two wires with positive and negative charges respectively to melt the wire, and the supersonic speed accelerated by the Rafal nozzle atomizes the melted wire into fine particles. Spray to the surface of the workpiece to form a layer, supersonic arc spraying particle speed, particle atomization effect, coating and basic bonding strength, coating porosity and other performance indicators, in the current international leading position in the field of arc spraying, suitable for both Workshop operation is also suitable for on-site use, an...

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to solve the problems of slow particle flight speed, low bonding strength, large void ratio, dense and uneven coating, and easy deformation of sprayed workpieces in the conventional arc and flame spraying, and provide a particle flying machine. Supersonic arc spraying anti-corrosion and wear-resistant coating with higher speed, better bonding strength, lower porosity, denser and more uniform coating, no deformation of the sprayed substrate, high-quality coating, and strong anti-corrosion and wear-resistant properties Floor