Hot-rolled steel plate anti-rust treatment agent and treatment method

Abstract

The invention relates to the field of corrosion science, and particularly relates to a hot-rolled steel plate anti-rust treatment agent and a treatment method. The hot-rolled steel plate anti-rust treatment agent comprises the chemical components of, in percentage by weight, 2%-10% of tannic acid, 1%-5% of sodium molybdate, 0.5%-3% of sodium dodecyl sulfate, 0.0005%-0.003% of biocide and the balance water; the surface of a hot-rolled steel plate is sprayed with the treatment agent in an on-line mode; when the surface temperature of the steel plate is 200 DEG C-100 DEG C, the treatment agent is dried to form a film at the residual temperature of the steel plate, and when the surface temperature of the steel plate is lower than 100 DEG C, the treatment agent is dried to form the film at the temperature of 200 DEG C-100 DEG C by adopting a hot air heating curing oven; a compressed air spraying mode is adopted; the pressure of the compressed air is 0.6 MPa-0.8 MPa, the caliber phi of a single nozzle is 1 mm-2 mm, and the distance between the nozzle and the steel plate is 200 mm-400 mm; and the spraying amount of the treatment agent on the surface of the steel plate is 25 ml / m < 2 >-40 ml / m < 2 >, and the film thickness is 6 microns-13 microns after the treatment agent is dried. The method is suitable for the hot-rolled steel plate, online anti-rust treatment is achieved, and the corrosion resistance of the steel plate is improved; and original product chemical components, rolling and cooling processes are not changed, complex equipment does not need to be added, and safety and environment friendliness are achieved.

Description

technical field [0001] The invention relates to the field of corrosion, in particular to a hot-rolled steel plate anti-corrosion treatment agent and a treatment method. Background technique [0002] In the context of increasingly fierce competition in the steel industry, improving service quality and user experience has become the only way to seize the market. Hot-rolled plate and coil are one of the main delivery states of steel products. However, during the storage and transportation of hot-rolled products after leaving the factory, due to the action of corrosive media in the environment, surface corrosion often occurs, commonly known as "Dahongpao". The occurrence of surface corrosion not only deteriorates the appearance of the product, but also affects the use of downstream users due to defects such as pockmarks, causing quality objections, reducing the reputation of the product, and causing huge economic losses to steel companies. The surface corrosion of hot-rolled p...

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Problems solved by technology

However, this method takes a long time to process and is difficult to apply to on-line treatment at the production site; in addition, organic solvents such as N-methylformamide in the treatment agent have the disadvantages of VOC emissions and flammability

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