Preparation method of microarc oxidation film doped ceramic micropowder on aluminum drill pipe surface

Abstract

The invention discloses a preparation method of a microarc oxidation film doped ceramic micropowder on an aluminum drill pipe surface, which comprises the following steps: a common direct-current or alternating-current microarc oxidation power supply is adopted, a workpiece aluminum drill pipe is connected to the positive pole of the power supply, and the negative pole adopts a common lead plate or stainless steel plate; the workpiece and negative pole are completely put in a microarc oxidation solution together, wherein the temperature of the oxidation solution is controlled at 20-50 DEG C; one or more of titanium carbide, boron carbide, boron nitride and chromium nitride ceramic micropowders subjected to targeting induction treatment is/are added; and under the current density of 3-30 A/dm<2>, the ceramic powder in the solution reaches the aluminum drill pipe surface, thereby preparing the microarc oxidation ceramic film containing one or more of titanium carbide, boron carbide, boron nitride and chromium nitride ceramic micropowders on the drill pipe surface. The microarc oxidation ceramic film has higher density and higher hardness. The method is beneficial to enhancing the wear resistance of the microarc oxidation ceramic film on the aluminum drill pipe surface and prolonging the service life of the aluminum drill pipe.

Description

technical field [0001] The invention relates to a method for preparing a micro-arc oxidation ceramic film doped with ceramic micropowder on the surface of an aluminum alloy drill pipe for oil drilling, which is suitable for preparing titanium carbide and boron carbide which are metallurgically combined with the film layer on the surface of an aluminum alloy drill pipe for oil drilling , boron nitride and chromium nitride ceramic powder or one or more micro-arc oxidation ceramic film. Background technique [0002] With the rapid development of the modern economy, the stock of petrochemical energy in shallow layers that is easy to develop in my country is rapidly declining, and the exploration and development of oil and gas resources are more and more targeted at deep and complex oil and gas reservoirs. With deep and ultra-deep wells, horizontal and extended-reach wells, high H content 2 A large number of complex and special wells such as S have appeared, and the working cond...

AI Technical Summary

Problems solved by technology

At present, one or more ceramic powders of titanium carbide, boron carbide, boron nitride and chromium nitride that have undergone targeted induction treatment are added to the micro-arc oxidation solution to prepare titanium carbide, The research on micro-arc oxidation ceramic film of one or more of boron, boron nitride and chromium nitride ceramic powder has not been reported yet.