Corrosion-inhibiting mist-suppressing promoter for steel pickling

Abstract

The invention discloses a corrosion-inhibiting mist-suppressing promoter for steel pickling, belonging to metal surface treatment chemicals. The promoter comprises, by weight, 20 to 50% of composite alkyl pyridine quaternary ammonium salt, 10 to 20% of alcohol, 5 to 10% of hexamethylene tetramine, 5 to 10% of sodium carboxymethylcellulose, 10 to 20% of an inorganic salt reducing agent, 5 to 20% of an organic metal ion chelating agent and 5 to 10% of water, wherein the inorganic salt reducing agent is one or two selected from the group consisting of sodium sulfite, sodium hydrosulfite, sodium metabisufite, sodium thiosulfate and ammonium thiosulfate, the organic metal ion chelating agent is one selected from the group consisting of aliphatic acid and a salt thereof, gluconic acid and a salt thereof, tartaric acid and a salt thereof and disodium EDTA, and the alcohol is methanol, ethanol or alkynol. The corrosion-inhibiting mist-suppressing promoter provided by the invention can substantially improve surface quality of a pickled steel plate.

Description

technical field [0001] The invention belongs to the technical field of metal cleaning by chemical method, and in particular refers to a corrosion and fog suppressing accelerator for steel pickling. Background technique [0002] At present, most iron and steel production enterprises use hydrochloric acid washing solution to clean the iron oxide scale on the hot-rolled plate. With the expansion of the production scale of iron and steel enterprises and the increase of steel output, the temperature of the hydrochloric acid washing solution is getting higher and higher, and the concentration is getting higher and higher. Due to the corrosiveness of strong acid, over-corrosion often occurs during the pickling process Not only the rust and dirt on the surface are removed, but also part of the metal substrate is washed off together, so the pickling process causes a great waste of metal materials and pickling liquid. Also produced a large amount of pickling waste liquid at the same ...

AI Technical Summary

Problems solved by technology

However, the practice in recent years has shown that both the newly installed continuous pickling mills and the technically improved continuous pickling mills in China have technological incompatibility in the process of hydrochloric acid pickling, and only require corrosion inhibitors to be used at high temperature and concentrated It is far from enough to exert the corrosion inhibition effect in acid for a long time, the stability of the corrosion inhibitor, the solubility in acid, the acid mist is serious, the pickling speed is slow, the surface quality of the hot-rolled plate after pickling is poor, and the acid regeneration The decomposition products of the system will directly affect the continuous production of cold rolling

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