Strip steel electrolysis descaling process and device

Abstract

The invention provides a strip steel electrolysis descaling process and device and relates to the technical field of steel part surface treatment. The strip steel electrolysis descaling process includes the following electrolysis steps that a neutral electrolyte, namely a Na2SO4 solution, is contained in an electrolytic cell, and the pH of the electrolyte is regulated to be 4-7.0; a plurality of pairs of electrodes are arranged in the electrolytic cell, each pair of electrodes is the same in polarity and arranged up and down, and the pairs of electrodes are divided into positive electrode pairs and negative electrode pairs; and strip steel penetrates through the space between each pair of electrodes, the pair of electrodes at the tail end of the strip discharging end is negative electrodes, and the strip steel is relatively a positive electrode, so that electrolysis descaling is carried out. The electrolysis time is shorter than the acid pickling time, the production is correspondingly increased, corrosion is avoided, environment pollution is eliminated or weakened, using is safe, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of steel surface treatment. Background technique [0002] "Descaling" in steel plate production usually refers to the removal of metal oxides on the surface of the steel plate to ensure the surface quality of the steel plate. [0003] Production of iron oxide scales on steel plates: [0004] In the steel plate production process, there are three processes that produce scale: [0005] (1) Before hot rolling, the slab is heated and kept warm (1200-1250°C) in a heating furnace to produce primary scale. The primary oxide scale consists of a dense surface layer and a loose inner layer. The surface layer is Fe 2 o 3 , Fe 3 o 4 and FeO, while the inner FeO accounts for 14%-16%, and the rest is Fe 3 o 4 and stomata. [0006] (2) After the hot-rolled slab comes out of the heating furnace, it is rough-rolled after the primary scale is removed by high-pressure water. During the short-term rough rolling and ...

AI Technical Summary

Problems solved by technology

[0009] (1) The iron oxide scale will be pressed into the strip steel matrix during rolling, which will affect the surface quality and processing performance of the cold-rolled sheet

[0010] (2) After the iron oxide scale is broken, it enters the cooling and lubricating emulsion system, which will damage the equipment and shorten the service life of the emulsion

[0011] (3) Iron scale and various impurities are easy to adhere to the surface of the dipped roll, which will damage the roll in the subsequent rolling process and affect the quality of the strip

[0020] To sum up, these descaling methods have not been promoted or are already facing elimination, which requires an urgent need for an energy-saving and environmentally friendly descaling method

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