Corrosion inhibitor for preventing surface of hot-rolled pickled steel from blackening and preparation method of corrosion inhibitor

Abstract

The invention discloses a corrosion inhibitor for preventing the surface of hot-rolled pickled steel from blackening and a preparation method of the corrosion inhibitor, and belongs to the technical field of metal surface treatment. The corrosion inhibitor is prepared by the following steps: preparing an intermediate from 3-anilino-1-phenylacetone and rosin glycidyl ethanolamine under the catalysis of acid, and compounding the intermediate with a surfactant. The molar ratio of the 3-anilino-1-phenylacetone to the rosin glycidyl ethanolamine is (1: 1)-(1: 2); and the molar ratio of the intermediate to the surfactant is (1: 1)-(1: 1.5). According to the corrosion inhibitor designed by the invention, the problem of blackening of a hot-rolled pickled plate after pickling is solved by obviously improving the gully-shaped morphology formed by severe grain boundary corrosion of the hot-rolled pickled steel.

Description

technical field [0001] The invention relates to a corrosion inhibitor, which belongs to the technical field of metal surface treatment, in particular to a corrosion inhibitor for preventing blackening of the surface of hot-rolled pickled steel and a preparation method thereof. Background technique [0002] Hot-rolled pickled steel is an intermediate product between hot-rolled and cold-rolled sheets, and its quality requirements are higher than those of hot-rolled sheets. Some hot-rolled pickled steels even need to be produced according to the quality requirements of cold-rolled sheets. Compared with ordinary hot-rolled sheets, hot-rolled pickled sheets have removed the oxide scale on the surface, and the surface quality has been improved, which is convenient for welding, oiling, electrophoresis, and painting. The use of hot-rolled pickled plates instead of corresponding cold-rolled plates can save production costs for enterprises. At present, hot-rolled pickling steel mainl...

AI Technical Summary

Problems solved by technology

[0003] During the development and production of hot-rolled pickled steel, it was found that some hot-rolled strip steel had blackening defects on the surface after pickling, which affected the surface quality of the finished product

This kind of defect gradually disappears after cold rolling with high rolling reduction, and has little impact on the surface quality of the finished product, but this defect has a greater impact on hot-rolled pickled steel products that "replace heat with cold"

Surface blackening defects not only affect the appearance of the product, but also have adverse effects on the subsequent processing and use of the product (stamping, welding, painting, etc.), bringing a series of problems in the customer application process, causing user complaints, and reducing product quality. market competitiveness

[0004] Traditional corrosion inhibitors have not significantly improved the blackening of hot-rolled pickled plates after pickling

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