Preparation method for high-wear-resistance micro-arc oxide layer of titanium alloy well-drilling workpiece

Abstract

The invention provides a preparation method for a high-wear-resistance micro-arc oxide layer of a titanium alloy well-drilling workpiece. The preparation method for the high-wear-resistance micro-arcoxide layer of the titanium alloy well-drilling workpiece comprises the following steps: step 1, carrying out oil removal treatment on the surface of the workpiece; step 2, preparing an electrolyte according to the components with the following concentrations: 16-26g / L of NaH2PO2, 16-28g / L of Na2SiO3 and 15-25g / L of NaAlO2; step 3, adding CE64 and PEG into the electrolyte; step 4, adding nanoscaleSiC powder, Al2O3 powder and graphite powder into the electrolyte in the step 3, and carrying out ultrasonic-assisted dispersion; and step 5, placing the workpiece into the electrolyte, and under anultrasonic condition, preparing a composite film layer on the surface of the workpiece by a direct-current pulse micro-arc oxidization method. The high-wear-resistance micro-arc oxide layer, preparedby the preparation method, of the titanium alloy well-drilling workpiece is high in film layer uniformity, low in surface roughness, and better in corrosion resistance and wear resistance because of being carried with a self-lubricating particle modified surface layer.

Description

technical field [0001] The invention belongs to the technical field of metal surface modification, and in particular relates to a preparation method of a highly wear-resistant micro-arc oxidation layer of a titanium alloy drilling workpiece. Background technique [0002] With the advancement of oil drilling technology, titanium alloy materials have gradually replaced other metal materials due to their advantages such as high specific strength, light weight, good toughness, and corrosion resistance, and become the main raw material for drilling workpieces. Generally, the surface of the workpiece is plated with metal layer, or the method of surface micro-arc oxidation, which is a new technology for in-situ growth of oxide ceramic film on the surface of Al, Ti and other metals and their alloys. [0003] In order to further extend the service life of titanium alloy drilling workpieces to meet the drilling needs of deeper waters and oil wells, titanium alloy micro-arc oxidation t...

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Problems solved by technology

However, none of the articles mentioned the size of the electrolyte particles added, and the particles with too large particle size are difficult to enter the pores on the surface of the ceramic layer, and cannot improve the film structure; in addition, the solid particles in the electrolyte need to Only by distributing and filling the oxidized ceramic layer more evenly can the overall corrosion resistance and wear resistance of the film layer be improved, but none of the above experiments involved the dispersion, suspension stability and agglomeration of particles in the electrolyte; at the same time, In this paper, only high hardness and wear-resistant oxide solid particles are added to reduce the friction coefficient through the mechanism of filling pores and dispersion strengthening, that is, improving the surface physical structure to play the role of micro-lubrication and micro-cutting, but the addition itself does not Particles with good lubricity, so it is still possible to further improve the wear resistance of the micro-arc oxidation particle-reinforced composite film layer