Preparation process of conductive corrosion-resistant hard alloy coating

By introducing a nickel-chromium-molybdenum ternary alloy binder phase, carbon nanotubes, and lanthanum oxide modifier into a cemented carbide coating, and combining it with a supersonic flame spraying process, the problem of traditional coatings being unable to balance conductivity and corrosion resistance in corrosive environments has been solved, resulting in a high-performance conductive and corrosion-resistant coating.

CN122169009APending Publication Date: 2026-06-09赣州海盛硬质合金有限公司
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Patent Information

Application Number
CN202610469680.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-10
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Traditional cemented carbide coatings fail to conduct electricity in corrosive environments due to preferential corrosion of the binder phase or formation of oxides, making it difficult to maintain performance in special applications requiring wear resistance and electrical signal transmission or current conduction.

Method used

A nickel-chromium-molybdenum ternary alloy was used as the binder phase, combined with carbon nanotubes and lanthanum oxide as functional modifiers. A conductive and corrosion-resistant coating was deposited on the substrate surface through a supersonic flame spraying process to construct a highly efficient conductive network and eliminate pore defects.

Benefits of technology

The prepared coating has a bonding strength of ≥75MPa, a volume resistivity of ≤6.0mΩ⋅cm, a self-corrosion potential of ≥-0.15V, and a neutral salt spray resistance time of over 1500 hours, ensuring stable electrical transmission and physical protection functions under extreme corrosive environments.

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Abstract

The invention relates to the technical field of thermal spraying, and discloses a preparation process of a conductive corrosion-resistant hard alloy coating, which is used for solving the problem of conductive failure of the existing hard alloy coating in a corrosive environment due to preferential corrosion of a binding phase or generation of an oxide. The invention provides a composite coating system based on nickel-chromium-molybdenum ternary alloy binding phase, carbon nano tube and lanthanum oxide double-effect modification and a whole-process optimization process. Complementary enhancement of mechanics and corrosion resistance is achieved through ternary alloying, a low-resistance conductive network is constructed through carbon nanotubes, and the density of the coating is improved by means of the interface purification effect of rare earth oxide. The prepared coating has excellent bonding strength, extremely low volume resistivity and excellent long-acting corrosion resistance, and double guarantee of physical protection and function conduction under severe working conditions is effectively achieved.
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