Acid adding inhibiter and method for acid pickling through acid adding inhibiter

Abstract

The invention relates to the field of inhibiters, and discloses an acid adding inhibiter and a method for acid pickling through the acid adding inhibiter. The acid adding inhibiter comprises quaternary ammonium compounds, thiourea, aluminum phosphate and / or aluminum dihydrogen phosphate and phytic acid and / or tannic acid. The acid adding inhibiter can be used in special steel such as automobile structural steel, is small in use amount and has excellent corrosion inhibition performance. Automobile structural steel hot-rolled acid pickling plates with good surface quality can be obtained. Besides, operation cost is low, and economic benefits are good.

Description

technical field [0001] The invention relates to the field of corrosion inhibitors, in particular, to a corrosion inhibitor for addition in acid, a preparation method for the inhibitor for addition in acid, and the use of the inhibitor for addition in acid to acidify automobile structural steel method of washing. Background technique [0002] P510, P510L, SAPH and other series of automotive structural steel hot-rolled pickled sheets are high-grade products in pickling sheets, mainly used for structural parts such as automobile chassis or inner door panels. quality, and the strength is higher than that of the cold-rolled sheet. With the continuous development of the automobile industry, the market's requirements for hot-rolled acid-washed sheets for automobiles continue to increase. On the premise of ensuring stamping and forming performance, it is also necessary to have a certain surface gloss to improve the surface quality of product coating and pre-treatment. The goal. ...

AI Technical Summary

Problems solved by technology

[0005] The inventor of the present invention found in the process of hot-rolled pickling of automobile structural steel with the existing corrosion inhibitor that the steel plate was often felt to be unclean after pickling. During the pickling process or during the drying process after pickling, It is often found that there are black spots, yellow spots, lumpy black spots and darkening on the whole plate surface, and the corrosion rate of the steel plate is very high and the quality loss is large, which not only affects the surface quality, but also has a negative impact on the subsequent treatment. , the inventor of the present invention thinks that this is due to the high content of chromium and vanadium in the steel of the automobile structure, and realizes that a corrosion inhibitor that is especially suitable for the steel of the automobile structure should be developed

Images