Nano additive used for steel pipe pickling solution and preparation method for nano additive

Abstract

The invention discloses a nano additive used for a steel pipe pickling solution and a preparation method for the nano additive. The nano additive is chemically modified nano lanthanum borate emulsion or / and nano cerium borate emulsion. A chemical modification agent adopts oleic acid and a surfactant. The surfactant is selected from any one or more of alkylbenzene sulfonate, fatty alcohol-polyoxyethylene ether or alkylphenol ethoxylates. The pickling solution is prepared by the nano additive and hydrochloric acid. The nano additive accounts for 0.01-2.0 wt% of the pickling solution. Compared with a hydrochloric acid pickling solution which does not contain a nano additive, the hydrochloric acid pickling added with the chemically modified nano lanthanum borate emulsion or / and the nano cerium borate emulsion can significantly reduce acid mist, improve the pickling efficiency and save the pickling time. An oxide skin on the surface of a pickled steel pipe is thoroughly removed, and the surface is uniform.

Description

technical field [0001] The invention relates to an environment-friendly and energy-saving nano-additive for steel surface pickling and a preparation method thereof, belonging to the technical field of steel pickling liquid. Background technique [0002] Pickling seamless steel pipes with traditional pickling solutions will cause the following problems: [0003] 1) Diluted sulfuric acid is used to directly clean the oxide layer. After the surface oxide layer is removed, the acid will react with the elemental iron in the inner layer, corrode the inner layer metal, change the physical properties of the product, and affect the product quality. [0004] 2) By increasing the temperature of the liquid in the pickling tank, the peeling off of the oxidized black skin is promoted. Due to the high temperature of the liquid, a large amount of acid mist is produced in the pickling pool, which damages the health of the workers in the pickling workshop, causes serious corrosion to the equ...

AI Technical Summary

Problems solved by technology

[0013] These methods have obvious disadvantages, and this method is no longer used for rust removal with sulfuric acid solution.

[0014] Nowadays, a single hydrochloric acid aqueous solution is generally used to derust the iron oxide on the surface of steel pipes. If it is too high, the production cost will increase, and at the same time, the high concentration of hydrochloric acid will volatilize a lot, which will often cause certain pollution to the workshop environment