Novel steel pipe rust remover and preparation method thereof

Abstract

The invention provides a novel steel pipe rust remover and a preparation method thereof, and relates to the technical field of metal surface conditioning agents. The rust remover comprises 18-23wt% of hydrochloric acid, 8-13wt% of oxalic acid, 1.8-2.3wt% of a corrosion inhibitor, 1.8-2.3wt% of EDTA, 1.8-2.3wt% of citric acid, 0.25-0.35wt% of an osmotic agent JFC, and the balance of water. The corrosion inhibitor is prepared by compounding urotropine, rosinyl imidazoline ammonium salt and industrial alcohol according to a weight ratio of 3:0.8:5. The novel steel pipe rust remover provided by the invention generates obviously less acid mist than simple acid solutions for rust removal in the prior art in the use process, and the replacement frequency of the rust remover is only 1 / 3 of that of the acid solutions under a same use frequency, so the acid waste is greatly reduced; and almost no steel pipe over-etching conditions appear in the production process, so 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 novel steel pipe rust remover and a preparation method of the steel pipe 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 methods and chemical methods. 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...

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 two problems: First, in the early stage of use of the rust remover, due to the high acid concentration and low ferrous ions, the rust removal speed is fast. Well, it is easy to cause over-corrosion of steel pipes; second, in the later stage of use of the above-mentioned acid solution rust remover, with the decrease of acid concentration and the increase of ferrous concentration, the rust removal speed will become very slow. The acid is strong and 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. The over-corrosion problem often occurs in the process, and the production cost of the enterprise is relatively high