A kind of compound pickling solution containing passivating agent and preparation method thereof

Abstract

The present invention belongs to the field of pure copper or copper alloy cleaning, and relates to an acid washing liquid obtained by adding other substances to a sulfuric acid solution to compound and having a passivation effect. According to the present invention, contaminated pure copper or copper alloy is washed, such that the pure copper or copper alloy restores the metal luster, is not damaged, and form a layer of a dense passivation film on the surface of the pure copper or copper alloy so as to maintain brightness and beautiful look and so as not to produce darkening after being stored for a long time; and the acid mist is less so as to easily achieve environmental protection and operator body health, the acid washing amount is high, and the acid treatment cost is low.

Description

technical field [0001] The invention belongs to the technical field of copper and copper alloy cleaning, and relates to a pickling solution passivator for cleaning copper and various copper-containing alloys. Background technique [0002] The traditional pickling and passivation of copper and its alloys adopts high nitric acid pickling and medium chromium passivation process. The rest of the parts with serious scale or carbon deposits have been corroded on the processing surface, resulting in batches of waste products. At the same time, a large amount of NOx is produced during the pickling process, which seriously pollutes the environment and damages the health of workers. In addition, the passivation solution Due to the high content of chromic anhydride, the production cost is also high, and the surface gloss of the parts after passivation is affected, and the discharged waste water pollutes the environment. [0003] The current pickling solution tends to add different sub...

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Problems solved by technology

The article introduces that although the effect is good, the pickling solution contains HNO 3 , a large amount of yellow smoke will be emitted during use, which will pollute the environment. At the same time, the passivator contains Cr, which will bring harm to both the operator and the environment.

[0006] In the document "New Bright Pickling Process for Copper and Copper Alloys", copper and copper alloys are cleaned through chemical degreasing, hydrochloric acid rinsing, and chemical light extraction. Although the disadvantages described in the above documents are avoided, the process flow is complicated and the When it comes to hydrochloric acid, the acid mist is relatively large, which is not good for operators and the environment; in addition, the chemical light formula involves a variety of acids, which is also relatively complicated