Environmental-friendly pickling solution for brass wires and preparation and application method thereof

Abstract

An environmental-friendly pickling solution for brass wires is characterized by comprising the following components including, by mass concentration ratio, 100 g / L-300 g / L of sulfuric acid, 0.1 g / L-3g / L of corrosion inhibitor, 0.1 g / L-2 g / L of a wetting agent and 0.5 g / L-5 g / L of a brightening agent and further comprises metal sulfate. The metal sulfate comprises ferric sulfate and the balance water, wherein the mass concentration of ferric ions of the ferric sulfate in the pickling solution is 10 g / L-40 g / L. The invention further discloses a preparation and application method of the picklingsolution. Compared with the prior art, the pickling solution has the beneficial effects that the pickling surface quality is good, the pickling metal loss is small, and the pickling cost is low; thepickling solution is suitable for large-batch industrialized pickling of the brass wires; the pickling solution does not contain nitric acid or nitrate, and the problems that in the pickling process,toxic and hazardous gas is generated and nitrogenous waste water treatment is difficult are thoroughly solved; meanwhile, the preparation method of the pickling solution is simple; the application method of the pickling solution is simple, easy to operate and suitable for industrialized large-scale pickling.

Description

technical field [0001] The invention belongs to the technical field of copper alloy surface cleaning, and in particular relates to an environment-friendly pickling solution for brass wire rods and a preparation and application method thereof. Background technique [0002] Pickling is an essential process in the production process of brass alloy wire rods. The purpose is to remove the surface oxide scale formed during heat treatment such as extrusion or high temperature annealing, so as to facilitate subsequent drawing operations. At present, copper processing enterprises producing on an industrial scale generally use a mixed acid solution prepared in a certain proportion with sulfuric acid, nitric acid and water to carry out pickling treatment on brass alloy wire rods. Sulfuric acid-nitric acid mixed system pickling has the advantages of simple process, low cost, and thorough oxide scale removal; however, it also has the disadvantages of violent reaction, prone to over-corro...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the defects of the sulfuric acid-nitric acid mixed system pickling solution, the invention patent application with the publication number CN105369267A "A Pickling Solution for Connector Copper Alloy Wire and Its Pickling Process Method" and the invention patent with the authorized announcement number CN104313610B " An environmentally friendly pickling agent for copper and copper alloys, and a pretreatment method for silver plating of copper and copper alloys, all use sodium nitrate to replace traditional nitric acid, and supplemented with other additives to reduce the reaction speed, but it cannot fundamentally avoid secondary production of nitrogen oxides

At the same time, it is unavoidable that nitrogen-containing wastewater is difficult to treat and affects the surrounding environment; most importantly, the enrichment of sodium ions in the subsequent process of adding sodium nitrate will also affect the pickling effect, which is why nitric acid cannot be replaced in the industrial production process. The main reason

The authorized announcement number is CN101942665B's invention patent "Pollution-free Bright Pickling Process for Copper and Brass Parts", which uses sulfuric acid and hydrogen peroxide as the main pickling solution supplemented by other additives. Although the pickling solution does not contain nitrogen dioxide gas However, hydrogen peroxide is unstable and easy to decompose, and the cost of auxiliary reagents added is high, so it is only suitable for cleaning small objects, not suitable for large quantities of brass wires, long-term, industrial scale acid wash job