Method for preparing seawater corrosion resistant cladding layer on steel matrix

Abstract

The invention discloses a method for preparing a seawater corrosion resistant cladding layer on a steel matrix, which belongs to the technical field of surface engineering. The method comprises a process of preparing mixed powder for cladding, wherein the mixed powder comprises the following raw material components in percentage by weight: 23 to 32 percent of Cr powder, 12 to 17 percent of Mo powder, 1 to 4 percent of W powder, 0.3 to 1 percent of Nb powder and the balance of Ni powder. The method for preparing the cladding layer comprises the following steps of: cladding the mixed powder to form a pre-cladding layer; and performing multilayer cladding. The method has the advantages that: Ni-Cr-Mo alloyed powder is not required to be prepared by processes such as a gas atomization method or a water atomization method and the like, powder raw materials required to be subjected to cladding are mixed by a mechanical material mixing method, a high-energy density laser beam is used for melting the mixed powder, an alloyed Ni-Cr-Mo anti-corrosion cladding layer is formed on the surface of the steel matrix in situ, the cladding layer is combined with the matrix in a metallurgy mode, and the dilution rate is low; preparation cost is relatively low, the cladding layer is resistant to seawater corrosion and has long service life, and the process is relatively simple; and the problem of preparation of the Ni-Cr-Mo anti-corrosion cladding layer is solved.

Description

Technical field [0001] The invention belongs to the technical field of surface engineering, and in particular provides a method for preparing a seawater corrosion-resistant cladding layer on a steel substrate, which is used to prepare a powder material for the seawater corrosion-resistant cladding layer and uses a laser cladding method on carbon steel and A cladding layer is prepared on the alloy steel substrate. Background technique [0002] The ocean is a severe and comprehensive corrosive environment. The content of chloride ions in the seawater is high and the conductivity is high. Therefore, ships are corroded more seriously in the seawater. The comprehensive corrosion mechanism of ship materials integrates various damage factors such as seawater impact, electrochemical corrosion, salt spray, strong sunlight exposure, marine corrosion and attached biological fouling. If appropriate anti-corrosion measures are not taken, the ship Will be severely corroded. Due to the limita...

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Problems solved by technology

This type of coating technology is characterized by short corrosion life and poor coating reliability

[0007] Alloys such as Zn-Al, Zn-Al-Mg, and Zn-Ni have good seawater corrosion resistance, but the thickness of corrosion-resistant coatings such as Zn-Al, Zn-Al-Mg, and Zn-Ni prepared by electroplating is only A few microns - dozens of microns (generally 70-80g / m 2 ), unable to meet the corrosion resistance requirements of ship steel plates

[0008] If the Ni-Cr-Mo alloy coating is prepared by thermal spraying, there are disadvantages such as low bonding strength (mechanical bonding), high porosity (1-10%), harmful phases in the coating, and easy peeling and failure of the coating. The corrosion resistance of the coating is much lower than that of industrial Ni-Cr-Mo alloy plates

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