Stainless steel electrochemical polishing liquid and polishing process

Abstract

The invention discloses stainless steel electrochemical polishing liquid and a polishing process, and relates to the technical field of surface electrochemical polishing of stainless steel equipment or products, in particular to the stainless steel electrochemical polishing liquid and the polishing process. The stainless steel electrochemical polishing liquid comprises compositions including, by weight, 15%-25% of sulfuric acid, 20%-35% of citric acid, 3%-10% of ethylene glycol, 1%-3% of ethylene diamine tetraacetic acid, 0.1%-0.5% of polyvinylpyrrolidone and the balance water. According to the stainless steel electrochemical polishing liquid and the polishing process, the sulfuric acid is a strong inorganic acid, has good dispersibility, can be completely ionized in the solution, helps toimprove the conductivity, dispersing ability and anode current efficiency of the polishing liquid and uniformly polishes the surface of the stainless steel; the citric acid has low acidity and high viscosity to prevent corrosion of the stainless steel; and the ethylene glycol is absorbed on the surface of the anode, formation of a diffusion layer is promoted, a film can be formed on the surface of the stainless steel together with citric acid to prevent over-corrosion of the stainless steel, and the polished stainless steel surface is bright and meticulous, and the reflectivity is greater than 98%.

Description

Technical field [0001] The invention relates to the technical field of stainless steel surface treatment, in particular to a stainless steel electrochemical polishing liquid and polishing process. Background technique [0002] Stainless steel has excellent properties such as mechanical wear resistance, chemical corrosion resistance and easy processing. It is widely used in chemical, petroleum, household appliances, hardware, food, machinery manufacturing and other industries. With the improvement of people's living standards, stainless steel products are becoming more and more popular. Kitchenware, tableware, etc. entering the family life, which require higher and higher requirements for stainless steel products, not only to be durable, that is, to have good protective performance, but also to achieve a mirror-bright, delicate and pleasing appearance. [0003] Polishing the surface of stainless steel equipment or products is the most commonly used treatment process in stainless ste...

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Problems solved by technology

[0004] Aiming at the deficiencies in the prior art, the present invention provides a stainless steel electrochemical polishing liquid and a polishing process, which solves the problem that the current electrochemical polishing liquid formula proposed in the above-mentioned background technology is basically composed of phosphoric acid, sulfuric acid, chromic anhydride, glycerin, etc. , the electrochemical polishing solution contains chromic anhydride, which is extremely harmful to the human body, and chromic anhydride contains hexavalent chromium, which is one of the banned chemicals. The solution has poor stability, and it is difficult to treat and recycle waste liquid. When using glycerin, a large number of bubbles will be generated during electrochemical polishing, which is not easy to dissipate, and will also affect the polishing effect. In addition, the electrochemical polishing liquid will corrode the workpiece before it is powered on, which will affect the polishing quality.