A processing pretreatment method for electrolytic grinding of high chromium alloys based on naoh electrolyte

Abstract

The invention provides a machining pretreatment method for electrolytic grinding of a high-chromium alloy based on NaOH electrolyte, and belongs to the field of electrochemical auxiliary processing. The surface of the high-chromium alloy is subjected to electrochemical treatment by adopting a constant potential polarization method, and a workpiece of the high-chromium alloy is used as a working electrode, Ag / AgCl electrode is a reference electrode, a platinum net electrode is an auxiliary electrode, NaOH with the concentration of 1M is used as an electrolyte, the electrode is treated for 15-45 seconds at the voltage of 5V, an oxide layer with the thickness of 10-17 microns is formed on the surface of the high-chromium alloy, and then the anode oxide layer is removed through mechanical machining, so that a final machining requirement is met. According to the method, a loose porous machining pretreatment oxidation layer can be rapidly formed on the surface of the high-chromium alloy through a simple electrochemical reaction, the thickness of the oxidation layer is controllable, the machining efficiency in the subsequent machining process is effectively improved, the machining forceis reduced, and the abrasion of a cutter is reduced.

Description

technical field [0001] The invention belongs to the field of electrochemical auxiliary processing, and relates to a processing pretreatment method based on electrolytic grinding of high-chromium alloys using NaOH electrolyte. Background technique [0002] Metal chromium is the hardest metal in nature and has high corrosion resistance. It is difficult to be oxidized in the air, even in the red hot state. Due to its stable physical and chemical properties, it is often used for chrome plating on metal surfaces for anti-corrosion and stainless steel. High chromium alloy materials play an extremely important role in major equipment manufacturing fields such as aerospace, shipbuilding, military industry, and nuclear reactors. The chromium content of high-chromium alloy is as high as 40%, which is superior to traditional stainless steel in terms of physical and chemical properties such as hardness and corrosion resistance. However, due to its extremely high hardness, good wear res...

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Problems solved by technology

The electrolytes used are NaCl and NaNO 3 , but due to the Cl in NaCl - It is very corrosive, the corrosion condition is bad during electrolytic machining, the corrosion is uniform, the difficulty and the thickness of the corrosion layer are difficult to control to achieve the effect of precision machining; while NaNO 3 Belonging to passivation electrolyte, it takes a long time to form a micron-scale thickness metamorphic layer suitable for electrolytic grinding, and the processing efficiency is very low

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