Compound type carbon steel pickling corrosion inhibitor and application thereof

Abstract

The invention provides a compound type carbon steel pickling corrosion inhibitor and application thereof and belongs to the technical field of corrosion inhibitors. The corrosion inhibitor comprises thiotriazinone-sulfonate-containing type surfactant, a heterocyclic compound and Tween, wherein the heterocyclic compound comprises at least one in 2-mercaptobenzothiazole and 2-aminobenzimidazole, andthe structure of the thiotriazinone-sulfonate-containing type surfactant is shown as the general formula (I), wherein n=5-11. The compound type carbon steel pickling corrosion inhibitor is mainly applied to carbon steel pickling, all the components which are the thiotriazinone-sulfonate-containing type surfactant, the small molecule heterocyclic compound and the Tween interact synergistically, thus a compact adsorption layer is formed on the surface of carbon steel, and the corrosion inhibition effect of the corrosion inhibitor on the carbon steel is improved.

Description

Technical field [0001] The invention belongs to the technical field of corrosion inhibitors, and specifically relates to a compound type carbon steel pickling corrosion inhibitor and its application. Background technique [0002] Among various metal materials, carbon steel is cheap and easy to smelt, and can meet most engineering requirements, so it is widely used in all aspects of machinery manufacturing. However, in the process of casting, forging, welding and heat treatment of carbon steel, a dense and strong adhesion oxide layer is easily formed on the surface of carbon steel, which affects its appearance and performance and must be removed. [0003] Pickling is one of the important means to remove the oxide layer on the surface of carbon steel. However, in order to prevent the "over-corrosion" phenomenon of the pickling process from causing the loss of steel materials, or to avoid the increase in surface roughness, and the hydrogen embrittlement of the metal surface, it is ec...

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Problems solved by technology

[0006] However, it is generally difficult for a single-component corrosion inhibitor to meet the pickling requirements. Therefore, it is necessary to design a compound corrosion inhibitor that can effectively improve the corrosion inhibition efficiency.

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