Wear-resistant and corrosion-resistant treatment method for aluminum-based workpiece surface in petroleum industry

Abstract

The invention provides a wear-resistant and corrosion-resistant treatment method for an aluminum-based workpiece surface in the petroleum industry. The wear-resistant and corrosion-resistant treatment method comprises the following steps: putting a workpiece to-be-processed in a dilute sulphuric acid electrolyte for electrolysis, controlling the electrolysis voltage to be 40-90 V, controlling the current density to be 0.5 A / dm<2> at the beginning of electrolysis, then gradually increasing the current density to be 2.5 A / dm<2> in 5-8 steps within 20-25 minutes, maintaining the current density in an electrolytic cell to be 2.5 A / dm<2>, controlling the electrolysis time to be 1-3 hours, thereby finally obtaining a dense aluminum oxide ceramic layer on the aluminum-based workpiece surface formed by self growing and with a thickness of more than 100 micrometers. The wear-resistant and corrosion-resistant treatment method provided by the invention realizes the wear-resistant and corrosion-resistant treatment of the aluminum-based workpiece surface in the petroleum industry based on a principle that the aluminum oxide ceramic layer forms on the aluminum element-containing workpiece surface by self growing based on a hard anodic oxidation technology, effectively solves the wear and corrosion problems of petroleum valve parts, impellers and other workpieces and is short in treatment process and time, high in rate of finished products, high in performance stability and wide in market prospect.

Description

technical field [0001] The invention relates to a wear-resistant and corrosion-resistant technology in the petroleum industry, in particular to a method for treating the surface of an aluminum-based workpiece in the petroleum industry based on a hard anodic oxidation method for self-growing ceramics. Background technique [0002] Generally speaking, the exploitation of oil can be roughly divided into two situations. One is that the underground pressure is relatively high, and the rise of oil can rely on the energy of the formation to self-spray, forming a self-spray well. This kind of situation needs to be avoided in the process of modern oil exploitation, and it is easy to cause a threat to the on-site construction personnel and related equipment; another situation is to rely on artificially supplemented energy such as oil well pumps and water injection pumps to exploit the oil in the gaps. By injecting a certain amount of mixed liquid into the porous rocks or gaps in the o...

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Problems solved by technology

However, the corrosion resistance of cast iron materials is poor, especially for sulfate ions (SO 4 2- ), chloride ion (Cl - ) and the corrosion resistance of the corrosion inhibitor is poor, which greatly shortens the service life of the entire equipment; in order to improve the above situation, the existing stainless steel impeller is used to replace the cast iron impeller on the market to improve the corrosion resistance of the equipment, but this method has certain limitations, (1) According to feedback from field use, the stainless steel impeller is to a certain extent resistant to sulfate ions (SO 4 2- ) and corrosion inhibitors have certain corrosion resistance, but for chloride ions (Cl - ) corrosion resistance has not been greatly improved; (2) The cost of stainless steel impellers is too high, more than double that of ordinary cast iron before; (3) According to relevant statistics, 40% of energy consumption in oil fields comes from The consumption of the water injection pump, and the energy consumption of the impeller accounts for more than 50% of the energy consumption of the water injection pump, so replacing cast iron with stainless steel does not fundamentally solve this problem

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