Heterocyclic carbon steel acid pickling inhibitor and application thereof

Abstract

The invention discloses a carbon steel acid pickling inhibitor and application thereof. The carbon steel acid pickling inhibitor is used for preventing carbon steel and products thereof from unnecessary corrosion and acid liquor consumption in an acid pickling process. The inhibitor is methyl blue, namely a heterocyclic organic compound. The application method of the inhibitor is characterized in that the cleaning liquor is diluted hydrochloric acid with concentration of 0.10-1.0kmol / m<3>, 0.010-2.0kg / m<3> of cleaning agent is added, the temperature is controlled between 25 DEG C and 30 DEG C, and carbon steel and products thereof to be cleaned are added and are immersed for 1-4 hours. The product is used for cleaning surfaces of carbon steel and products thereof, can prevent excessive erosion of metals and excessive consumption of acid liquor in a cleaning process, and has the prominent advantages of low dosage, high efficiency and strong sustained action capacity.

Description

technical field [0001] The invention relates to the technical field of corrosion inhibitor production, in particular to an environment-friendly heterocyclic high-efficiency carbon steel pickling retarder used to prevent unnecessary corrosion and acid consumption of carbon steel and its products in the pickling process. etchant and its application. Background technique [0002] Steel is used more and more widely. In the process of product processing and application, dilute sulfuric acid or dilute hydrochloric acid is often used to clean the surface to remove the oxide film or corrosion products on the surface. Since strong acid has a corrosive effect on metal equipment, it is often used in the pickling process. The phenomenon of "over-corrosion" occurs. This process will not only cause corrosion of metal materials, but also produce a large amount of acid, which will cause serious damage to the environment. In order to avoid excessive consumption of metal or acid during pickl...

AI Technical Summary

Problems solved by technology

[0003] Currently commonly used cleaning agents mainly include toxic inorganic corrosion inhibitors such as chromate, nitrate, and nitrite, as well as some organic phosphorus corrosion inhibitors, whose discharge may cause eutrophication of water bodies. Most cleaning agents have toxic and side effects, do not have market competitiveness, and do not meet the worldwide environmental protection requirements