A powder core wire material for arc spraying with high bonding strength and preparation method thereof

Abstract

The invention discloses a high-bonding-strength powder core wire for arc spraying. The powder core wire consists of a coating layer and a powder core; the coating layer is an austenitic stainless steel narrow strip; the powder core is 20-50% of the total mass percentage of the wire; and the powder core is formed by mixing the following powder raw materials in percentage by mass: 30-50% of WC powder, 8-15% of TiC powder, 6-12% of TiB2 powder, 5-10% of Cr3C2 powder, 15-30% of Ni powder, 8-15% of Cr powder, 5-10% of Co powder, and the balance of Fe powder. The invention further discloses a preparation method of the powder core wire; firstly, the powder raw materials are added in a powder mixing machine for mixing; the mixed powder raw materials are fully dried; then, the stainless steel strip is cut as an appointed width, and is bent in two side directions to form a U-shaped groove; finally, the dried powder raw materials are added in the U-shaped groove; and the powder core wire is prepared by a gradual drawing or wire pricking method through welding wire drawing equipment. The wire forms a continuous and compact arc coating layer, and is excellent in high-temperature resistance, wear resistance and corrosion resistance; and the coating layer reaches the bonding strength of more than 40 MPa and the hardness of more than HV400.

Description

technical field [0001] The invention relates to the technical field of metal surface corrosion and protection, in particular to a powder core wire material for arc spraying with high bonding strength and a preparation method thereof. Background technique [0002] Corrosion of steel materials is one of the main forms of failure of metal equipment and components, which has brought huge economic losses, caused some catastrophic accidents, and consumed precious resources. Arc spraying technology has been successfully applied to steel structures such as bridges, iron towers, underground pipe networks, and low-temperature chemical reaction equipment. At present, the wires used in arc spraying include metallic solid wires and powder-filled cored wires. Among them, arc sprayed ceramic coatings mostly use powdered cored wires. According to different needs, you only need to deploy different powdered cores or strips. The sprayed coatings with different properties are obtained, which h...

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Problems solved by technology

For example, the base material of the stirring blades and bearings of the titanium dioxide acid hydrolysis twin-shaft stirring reactor is 45# steel, which is produced at a high temperature of 180-220°C and 83-86% concentrated sulfuric acid, and its service life is only 3-5 pieces. moon

There are also pipeline chemical reactors. The steel pipeline is lined with refractory castables, ceramic patches, and hard plastic patches to improve the service life of the pipeline. However, wear-resistant castables have poor wear resistance, ceramic patches, The integrity of the hard plastic sheet is not good, and the reactants are easy to fall off in the environment of strong convection, which seriously affects the production efficiency of the enterprise, and the overall service life is low. Strong erosion, as well as the corrosion and wear of acid-base oxides in the dust, to improve the life of the reactor, it is necessary to spray a corrosion-resistant and wear-resistant coating with strong adhesion, high density and high strength on the corrosion-resistant surface

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