Sulfuric acid washing corrosion-retarding fog inhibitor and preparation method thereof

Abstract

The invention discloses a sulfuric acid washing corrosion-retarding fog inhibitor and a preparation method thereof. The sulfuric acid washing corrosion-retarding fog inhibitor comprises an inhibitor, a complexing agent and a wetting agent, wherein the inhibitor comprises di-o-tolyl-thiourea, o-toluidine, sulfonated protein and ethylene diamine tetraacetic acid; the complexing agent comprises sodium citrate, sodium tartrate, hydroxyacetic acid and gallic acid; and the wetting agent comprises sodium sulfonate, sodium carboxylate, L-548 and OP-10. The sulfuric acid washing corrosion-retarding fog inhibitor can retard the excessive corrosion of sulfuric acid to steel matrix, also can be used as an acid washing fog inhibitor, and has good stability at high temperature; and the capability of inhibiting acid fog can reach over 95 percent, the highest corrosion-retarding capability can reach over 98 percent, and the stability is no less than 5 hours.

Description

technical field [0001] The invention relates to a corrosion inhibitor and fog inhibitor for sulfuric acid pickling, which belongs to the field of chemical anticorrosion. Background technique [0002] At present, most of the metal rust removal methods are pickling, but in the pickling process, if the pickling speed is too fast, it will cause metal corrosion, and because a large amount of hydrogen atoms will be released during the pickling process, After these hydrogen atoms penetrate into the metal body, it will cause "hydrogen embrittlement" of the metal and deteriorate the performance of the metal. Therefore, it is necessary to add a pickling corrosion inhibitor during the pickling process of the metal to reduce the corrosion of the metal during pickling. Speed, thereby reducing the surface corrosion of metal materials, hydrogen embrittlement and metal weight loss. Since the 1980s, foreign countries have focused on the development of nitrogen-heterocyclic quaternary ammoni...

AI Technical Summary

Problems solved by technology

Since the 1980s, foreign countries have focused on the development of nitrogen-heterocyclic quaternary ammonium salt pickling corrosion inhibitors; the advantage of this type of synthetic product is that it has good corrosion inhibition effect in pickling High stability, with the functions of corrosion inhibition, demulsification, cationic surface activity, etc., it is a multifunctional corrosion inhibitor, but the price is relatively high

Domestic commercial corrosion inhibitors first appeared in 1958, and are mainly divided into the following categories: aldehyde-amine condensation polymers; thiourea and its derivatives; pyridine, quinoline and their derivatives; domestic commercial corrosion inhibitors The corrosion effect is limited by the technical conditions, the corrosion inhibition rate is actually not more than 95%, and the stability is poor at high temperature, and the consumption is large.

[0003] Fog suppressant is a preparation that suppresses the acid mist produced by metal during the pickling process. The metal will produce a large amount of acid mist during the pickling process. These acid mist will not only cause environmental pollution, but also corrode the surrounding appliances and supplies. It even has an impact on human health, and the anti-fog agents currently used in China are not ideal

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