Environment-friendly pickling inhibitor and application thereof in pickling of carbon steel

Abstract

The invention discloses an environment-friendly pickling inhibitor and an application of the environment-friendly pickling inhibitor in the pickling of carbon steel, to effectively solve the problem of the pickling of the carbon steel. The chemical components of the environment-friendly pickling inhibitor include water and any two or three of urotropin, cation surfactant, dodecyl dimethylbenzyl ammonium chloride, octadecyl dimethylbenzyl ammonium chloride, dodecyl dimethylbenzyl ammonium bromide, myristyl dimethyl ammonium chlorid; the method for application of the environment-friendly pickling inhibitor to the pickling of the carbon steel comprises the steps: adding the pickling inhibitor into a hydrochloric acid solution or a sulphuric acid solution with a concentration of 1.0-10mol / L according to the ratio of 1L of acid solution to 0.05g-2g of the pickling inhibitor; immersing the carbon steel to be washed or a carbon steel product in the acid liquid added with the pickling inhibitor; and controlling the temperature to be 20-70 DEG C and immersing time to be 5-20min. The pickling inhibitor provided by the invention is a pickling inhibitor friendly to the environment. The pickling inhibitor is non-toxic and harmless, is environment friendly, does not cause environmental problems after application, and conforms to the development trend of the green corrosion inhibitors.

Description

technical field [0001] The invention relates to a pickling corrosion inhibitor and its application, in particular to an environment-friendly carbon steel pickling corrosion inhibitor and its application in carbon steel pickling Background technique [0002] Pickling is a common pretreatment technology for removing rust and oxides on metal surfaces, and it is widely used in metal materials, machinery, metallurgy, electric power, chemical industries and other industries. The acids commonly used in pickling include hydrochloric acid, sulfuric acid, nitric acid, etc. They clean the metal surface and also pickle the metal material. The hydrogen gas generated by the reaction between the metal and the acid will cause hydrogen embrittlement corrosion of the metal and bring out a large amount of The acid mist has a strong irritating smell, affects the working environment, corrodes workshop equipment, and causes a large amount of useless consumption of hydrochloric acid. Therefore, p...

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Problems solved by technology

[0004] Chinese Patent Publication (Announcement) No.: CN102363888 discloses a corrosion inhibitor in the pickling process and a preparation method thereof. The main components of the corrosion inhibitor include isopropanol, propynyl alcohol, halides, reducing agents and inhibitors, but among them Propylene alcohol is a highly toxic substance; Chinese Patent Publication (Announcement) No.: CN102134722 discloses a carbon steel pickling corrosion inhibitor and its application. The corrosion inhibitor component is aniline aldehyde polymer, which is widely used in production , its corrosion inhibition effect is excellent, but from the perspective of production cost, aniline aldehyde corrosion inhibitors have to go through a complicated synthesis process, the production cost is high, and the production process will produce three wastes, polluting the environment

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