A cleaning agent for the surface of chrome-plated substrates

Abstract

The invention provides a cleaning agent used for the surface of a chrome-plated substrate. The cleaning agent comprises, by weight, 60-89% of a mixed alkali solution, 5-30% of a compound surfactant, 5-20% of a conductivity accelerating agent, 1-5% of an antifoaming agent and 0-10% of a chelating agent.

Description

technical field [0001] The invention relates to metallurgical machinery / rolling lubrication technology, in particular to a cleaning agent for the surface of a chrome-plated substrate. Background technique [0002] Chromium-plated steel sheet is a kind of steel sheet formed by electrolytically treating thin strip steel in a chromate solution. Its purpose is to enhance the surface adhesion of thin strip steel to the coating and improve the corrosion resistance of the steel sheet. Due to the lower production cost of chrome-plated sheet than tin-plated sheet, its application fields are becoming wider and wider. The chrome-plated layer on the chrome-plated plate is a cathodic plating layer, so its surface coverage has a great influence on the performance of the chrome-plated plate. The chromium layer on the surface of the chrome plate usually contains a layer of metallic chromium (0.01-0.02 μm) and chromium hydrated oxide (0.015-0.03 μm). The thickness of the two coatings is ext...

AI Technical Summary

Problems solved by technology

However, due to the use of too much sodium carbonate, polysodium phosphate, gluconate and other cleaning aids in this formula, its alkali cleaning ability is insufficient, and it cannot meet the cleaning needs of high-saponification value rolling oil under high-speed operation.

[0008] To sum up, it can be seen that the cleaning agents currently used for strip steel are usually aimed at primary cold-rolled products, and various complex surfactants and chelating agents are usually added to the cleaning agent to improve the emulsification of rolling oil and remove various components. However, for chromium-plated substrates, the rolling oil of the secondary cold-rolled strip is unique, and the composition characteristics of the residual oil on the surface are completely different from those of the primary cold-rolled plate, mainly due to the residual oil on the strip surface, iron There is less soap, but the saponification value of residual oil is high, and the plate surface is unevenly distributed. In addition, the lubrication process is one-time direct injection lubrication, so there are fewer metal ions on the surface of the strip, and the cleaning agent needs to quickly wet the surface in the cleaning unit Remove residual oil on the surface. At the same time, the working current density in the electrolysis section is relatively high. During the cleaning process, the electrolytic operation is relied on to remove the residual oil, and the oil is quickly cleaned with lye. In addition, there are many brush rollers in the scrubbing section. Production such as A large amount of foam will be generated, which will affect the cleaning effect, so more attention should be paid to the nature of the foam generated by alkaline detergent

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