A processing pretreatment method based on electrochemical dealloying of high chromium alloy
A high-chromium alloy, electrochemical technology, applied in the field of electrochemical auxiliary processing, can solve the problems of small potential difference of high-chromium alloy components, difficult to apply, etc., and achieve the effects of reducing processing force, improving processing efficiency, and reducing tool wear.
Active Publication Date: 2021-01-05
DALIAN UNIV OF TECH
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Problems solved by technology
The traditional electrochemical dealloying method is difficult to apply due to the small potential difference between the components of high-chromium alloys
Method used
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[0021] A preparation method for a super-hydrophilic surface of a high chromium alloy, specifically comprising the following steps:
[0022] The first step, high chromium alloy surface pretreatment
[0023] Take the high chromium alloy plate, conduct electric discharge wire cutting to 20mm×20mm, the actual processing area is 20mm×20mm, and then use the three-electrode electrochemical system for electrochemical treatment, in which the working electrode is the high chromium with smooth surface after the above pretreatment Alloy, the reference electrode is Ag / AgCl electrode, the auxiliary electrode is platinum mesh electrode; the electrolyte is NaNO with a concentration of 1.5M 3 solution, the pH of the solution was adjusted to 10 using NaOH solution.
[0024] The electrochemical treatment is a constant potential polarization method, and the treatment is performed at a constant potential of 6V for 100s. After the electrochemical treatment, the sample was taken out, rinsed with d...
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The invention belongs to the field of electrochemical auxiliary machining and provides a processing pretreatment method based on high-chromium alloy electrochemical dealloying. The method comprises the following steps that electrochemical dealloying pretreatment is conducted on high-chromium alloy, a high-chromium alloy workpiece is soaked in electrolyte for electrochemical dealloying treatment, and a three-electrode electrochemical system is adopted in the treatment process; and then a pretreatment layer is removed through machining. On the basis of a special reaction mechanism of Cr and Fe elements in an alkaline solution, electrochemical polarization in an alkaline condition promotes dissolution and removal of Fe elements on the surface of the alloy and inhibits dissolution and removalof Cr elements, so that dealloying is realized, and a loose porous structure is formed on the surface; and the dealloying pretreatment layer is removed by using machining methods such as milling, grinding and the like. The machining efficiency is high, the cutting force is small, cutter abrasion can be reduced, and the method is suitable for ultra-precision machining of the high-chromium alloy.
Description
technical field [0001] The invention belongs to the field of electrochemical auxiliary processing, and in particular relates to a processing pretreatment method based on electrochemical dealloying of high-chromium alloys. Background technique [0002] Metal chromium has extremely high hardness and strong corrosion resistance. In the air, even in the hot high temperature state, the oxidation rate is very slow. Chromium, as an important and common alloying element, becomes an engineering material with heat resistance, heat strength, wear resistance and special properties after being alloyed with iron, nickel, cobalt, titanium, aluminum, copper, etc. These materials are widely used in aviation, aerospace, nuclear reactor, automobile, shipbuilding, chemical industry, military industry and other industries. Due to the high content of chromium element, high chromium alloy has high hardness and good high temperature oxidation resistance, corrosion resistance and wear resistance. ...
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IPC IPC(8): C25F3/06
CPCC25F3/06
Inventor 金洙吉姜冠楠朱祥龙张富林施远
Owner DALIAN UNIV OF TECH