Alkaline chemical polishing method and adopted alkaline chemical polishing solution thereof

Abstract

The invention discloses an alkaline chemical polishing method and an adopted alkaline chemical polishing solution thereof. The method comprises the steps that aluminum and / or aluminum alloy is put in absolute ethyl alcohol to conduct pretreatment, and then deionized water is utilized to wash the aluminum and / or the aluminum alloy cleanly; the pretreated aluminum and / or the pretreated aluminum alloy is put in the alkaline chemical polishing solution to conduct alkaline chemical polishing; the polished aluminum and / or the polished aluminum alloy is sequentially put in dilute nitric acid to be neutralized and put in the deionized water to conduct ultrasonic cleaning for 5-15 min, and then the treated aluminum and / or the treated aluminum alloy is taken out and dried. The alkaline chemical polishing solution is an aqueous solution composed of the following components, 100-500 g / L sodium hydroxide, 50-200 g / L sodium nitrate, 100-500 g / L sodium acetate, 10-150 g / L sodium bromate, 5-20 g / L sodium fluoride and 0.1-4 g / L heavy-metal sulfate. The alkaline chemical polishing method is friendly to the environment, the brightness and the flatness of polished aluminum alloy surface are both better.

Description

technical field

[0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to an alkaline chemical polishing method and an alkaline chemical polishing liquid used therein. Background technique

[0002] Methods for polishing aluminum and aluminum alloy surfaces mainly include mechanical methods, electrochemical methods and chemical methods. Mechanical polishing and electrochemical polishing have certain requirements on the shape and size of parts, so their use is limited. However, chemical polishing is not limited by the shape and size of parts, and can process more parts at one time. Therefore, it is currently the most commonly used polishing method.

[0003] The existing chemical polishing methods mainly use acidic chemical polishing liquid (containing phosphoric acid, sulfuric acid and nitric acid, commonly known as three-acid polishing liquid). The advantages of acidic chemical polishing liquid are: better polishing effect, ...

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