Scale remover

Abstract

The invention provides a scale remover and belongs to the technical field of electroplating. The scale remover comprises an oxidizing agent, a stabilizer, a catalyst, a builder and a solvent. The oxidizing agent is selected from at least one of hydrogen peroxide or sodium persulfate; the stabilizer is selected from at least one of phytic acid or ethylene glycol butyl ether or hydroxyethylidene diphosphonic acid; and the builder is selected from at least one of ammonium fluoride or ammonium bifluoride or hydrofluoric acid. No strong oxidative acid such as nitric acid or the small amount of the strong oxidative acid is added into the scale remover, corrosivity is not significant, an aluminum alloy is not corroded, and the dimensional precision of the aluminum alloy is not affected. Meanwhile, phosphorus discharging is avoided, and waste water treatment is simple and easy. Discharging of pale brown smog such as nitrogen oxides is also avoided, the production environment is improved, and waste gas treatment is reduced.

Description

technical field [0001] The invention relates to the technical field of electroplating, in particular to a scale remover. Background technique [0002] Generally, in the pre-plating treatment of die-casting or machine-added aluminum alloy products, the descaling process uses the traditional nitric acid plus hydrofluoric acid method or uses the phosphoric acid (H 3 PO 4 )50%, adding nitric acid (HNO 3 68%) 30% and hydrofluoric acid (HF40%) 10% and the technological method (hereinafter referred to as " three-acid method ") of immersion tens of seconds under the solution normal temperature of surplus water. [0003] After the die-casting aluminum alloy products are descaled by traditional nitric acid plus hydrofluoric acid method or "tri-acid method", the surface is white and the color is uniform. [0004] However, the traditional descaling and three-acid methods mainly have the following disadvantages: due to the use of concentrated nitric acid, concentrated phosphoric acid...

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Problems solved by technology

[0004] However, the traditional descaling and three-acid methods mainly have the following disadvantages: due to the use of concentrated nitric acid, concentrated phosphoric acid, and concentrated hydrofluoric acid, the configuration is dangerous and the pungent smell is large; the phosphoric acid consumption is large, and the phosphorus discharge is large; the working concentration is high, and the total Large amount of emissions; during use, a large amount of brownish-yellow nitrogen oxide smoke is generated, which deteriorates the production environment, and the amount of waste gas treatment is large; the solution is highly corrosive, and the size of the parts removed is large, etc.

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