A kind of rust remover and preparation method thereof

Abstract

The invention provides a rust remover and a preparation method of the rust remover, and relates to the technical field of metal surface treatment agents. The rust remover comprises, by weight percent, 2.5% of hydrofluoric acid, 17% of hydrochloric acid, 7.5% of oxalic acid, 3% of a corrosion inhibitor, 2% of diaminoethane quadrol, 0.6% of ethylene oxide and high-level fatty alcohol condensation compound and the balance water. The corrosion inhibitor is formed by compounding naphthamine, imidazolidinyl urea and rosin imidazoline ammonium salt according to the weight ratio being 3:0.4:0.9. In the using process of the rust remover, compared with pure acid liquor rust removal in the prior art, the acid mist generated by the rust remover is obviously reduced; and on the premise that the use frequency is equal, the replacement frequency of the rust remover is only half that of the prior art, the waste of acid is reduced to the greatest extent, the production process is more environment-friendly, and the production cost of steel pipe enterprises is greatly reduced.

Description

technical field [0001] The invention relates to a metal surface treatment agent and a preparation method thereof, in particular to a rust remover and a preparation method of the rust remover. Background technique [0002] Before phosphating and cold drawing, steel pipes are usually derusted. At present, there are two types of rust removal methods in the industry: mechanical method and chemical method. Due to the high labor intensity, low efficiency and serious dust pollution of the mechanical method, except for a few cases, the general steel pipe manufacturers use chemical methods for rust removal. [0003] The simplest method for chemical rust removal of steel pipes is to use hydrochloric acid or sulfuric acid to treat the rust on the surface of steel pipes. In terms of rust removal effect, hydrochloric acid is higher than sulfuric acid, but it has one of the most fatal shortcomings: in the production process, hydrochloric acid It is volatile and produces a large amount o...

AI Technical Summary

Problems solved by technology

Due to the high labor intensity, low efficiency and serious dust pollution of the mechanical method, except for a few cases, the general steel pipe manufacturers use chemical methods for rust removal.

[0003] The simplest method for chemical rust removal of steel pipes is to use hydrochloric acid or sulfuric acid to treat the rust on the surface of steel pipes. In terms of rust removal effect, hydrochloric acid is higher than sulfuric acid, but it has one of the most fatal shortcomings: in the production process, hydrochloric acid It is volatile and produces a large amount of acid mist, which not only deteriorates the operating environment, but also causes certain corrosion to the surrounding steel structures and related equipment

Whether it is hydrochloric acid rust removal or sulfuric acid rust removal, there are the following problems: in the later period of use of the above-mentioned acid solution rust remover, as the acid concentration decreases and the ferrous concentration increases, the rust removal speed will become very slow. At this time, even if the acid concentration is increased, the effect is not great. Under this situation, if you want to completely remove the rust, you have to completely replace the acid solution in the acid tank. Therefore, simply using acid to remove rust will cause a large amount of acid solution to be wasted. , which is not good for the environment, and the production cost of the enterprise is also high