Non-chromium electrolytic polishing solution for stainless steel and surface polishing process for stainless steel

Abstract

The invention discloses a non-chromium electrolytic polishing solution for stainless steel and a surface polishing process for stainless steel. The polishing solution mainly comprises alcohol (at least one selected from the group consisting of methanol and ethanol) and acid (at least one selected from the group consisting of sulfuric acid and acetic acid). The surface polishing process for stainless steel provided in the invention comprises the following steps: removal of oil stains, rinsing with ultrasonic vibration, pickling with ultrasonic vibration, alkali washing with ultrasonic vibration, electropolishing, rinsing with ultrasonic vibration, passivation, cleaning and drying. Compared to conventional electrolytic polishing solutions for stainless steel, the polishing solution provided in the invention contains no chromic anhydride, which enables environmental pollution to be reduced and waste liquid to be easy to treat, being an environment-friendly type polishing solution; the polishing solution further contains no expensive phosphoric acid, which enables polishing cost to be reduced and is favorable for the popularization of the electropolishing process for stainless steel. According to results of tests, the polishing solution and the process provided in the invention can effectively remove oxide films and scratches on the surface of stainless steel, enable a workpiece to have an effect of mirror brightness, and effectively enhance the quality of polishing.

Description

technical field [0001] The invention relates to a stainless steel chromium-free electrolytic polishing liquid and a stainless steel surface polishing process. Background technique [0002] Due to its excellent performance of atmospheric corrosion resistance, stainless steel is widely used in construction, chemical industry, instrumentation, and aerospace industries. However, it will form a layer of oxide skin after being placed on the surface for a long time after thermal processing and mechanical processing, so it needs to be treated in an appropriate way. Among many methods, the polishing process has been greatly popularized and applied as a very mature process. . [0003] Stainless steel polishing can be divided into three processes: mechanical polishing, chemical polishing and electrolytic polishing. The mechanical polishing process needs to use high-temperature pickling equipment and consumes a lot of power, so the cost is relatively high. The cost of chemical polish...

AI Technical Summary

Problems solved by technology

[0005] Traditional stainless steel electrolytic polishing solutions usually use chromic anhydride and phosphoric acid as etchant. Although chromic anhydride enhances the polishing effect, it is highly toxic and corrosive, and the waste liquid pollutes the environment. Phosphoric acid is expensive, and a large amount of use improves the process. The use cost, which limits the promotion of stainless steel polishing process to a certain extent

Traditional polishing fluids usually use glycerin, polyethylene glycol, etc. as corrosion inhibitors. These macromolecular alcohols limit the rapid formation of mucous membranes on the workpiece surface during polishing, which is a relatively backward process.

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