Acid pickling assistant for removing residual thick-layer black oil spots on cold-drawn steel pipe and preparing method

Abstract

The invention discloses an acid pickling assistant for removing residual thick-layer black oil spots on a cold-drawn steel pipe. The acid pickling assistant comprises, by mass percent, 30%-50% of sulfuric acid with the mass concentration being 98%, 2%-5% of hydrofluoric acid with the mass concentration being 50%, 2%-5% of methanesulfonic acid, 2%-5% of phosphoric acid with the mass concentration being 85%, 2%-5% of oxalic acid, 2%-5% of oleic acid, 1%-3% of tartaric acid, 0.5%-1.5% of urotropin, 1.5%-3.5% of a QYL-211A acid degreasing, oil removing and rust removing restraining acid mist three-in-one surfactant, 1.5%-3.5% of a QYL-290 deposition carbon removing surface active agent, 1.5%-3.5% of JFC and the balance tap water. An existing production line does not need to be changed, the acid pickling assistant only needs to be added into an existing out-line line acid washing and oil removing two-in-one bath solution, the residual thick-layer black oil spots on the cold-drawn steel pipe can be rapidly and thoroughly peeled, and the product quality is guaranteed.

Description

technical field [0001] The invention relates to a pickling aid for metal workpieces, in particular to a pickling aid for removing thick black oil spots remaining on cold-drawn steel pipes and a preparation method thereof, which can quickly and thoroughly strip off the thick-layer black oil spots remaining on cold-drawn steel pipes. Background technique [0002] The raw materials used for high-end furniture with steel and stainless steel structures are cold-drawn pipes of various specifications. Usually, degreasing, silane pottery and other treatments are performed before surface spraying and coating. The specific process flow is outside the line: acid Washing and degreasing two-in-one→water washing→neutralization→rust prevention between processes; inside wires: degreasing→degreasing→water washing→water washing→silane vitrification→water washing→solid film→drying→electrostatic powder spraying, outside wires and inside wires All are operated at room temperature. However, due ...

AI Technical Summary

Problems solved by technology

However, due to the equipment and process of drawing pipes, a large number of thick black oil spots will remain on the surface of steel pipes produced by individual enterprises, which cannot be removed by the existing pickling and degreasing steps, which directly affect the steel structure and Production of high-end furniture such as stainless steel structures