Electrolyte for use in evaluating rinsing performance of alkaline degreaser and using method thereof

Abstract

The invention discloses electrolyte for use in evaluating rinsing performance of alkaline degreaser, which comprises the following chemical components in weight percentage: 0.1 to 10 percent of disodium hydrogen phosphate, 0.5 to 1.2 percent of sodium dihydrogen phosphate, 0.01 to 0.1 percent of boric acid, 0.1 to 0.9 percent of sodium bicarbonate and the balance of water. The using method of theelectrolyte comprises the following steps of: removing oil from a sample, washing the sample with water, blow-drying the washed sample and rinsing the sample in degreaser; washing the rinsed sample in de-ionized water; and testing a linear sweep voltammetry (LSV) reduction curve of the sample by using a potentiostat / galvanostat and evaluating the rinsing performance of the degreaser according to the residue content of the degreaser on a substrate. Compared with the prior art, the electrolyte and the using method thereof have the advantages of short measuring time, high analytic sensitivity, exact and reliable results and high repeatability and provide a theoretical basis for production and selection of the proper degreaser.

Description

technical field [0001] The invention relates to a steel plate degreasing and rinsing technology, in particular to an electrolyte solution for measuring the rinsing performance of an alkaline degreasing agent and a method for using the same. Background technique [0002] During the production or processing of cold-rolled steel sheets, the surface of the steel sheets will be contaminated with various dirt and impurities such as grease, dust, metal powder, etc. Alkaline degreasing agents are usually used to degrease the metal. Alkaline degreasing agents generally include alkaline substances, builders, chelating agents, defoamers and other inorganic and organic substances, through penetration, dissolution, emulsification, solubilization, etc. to achieve the effect of removing oil on the metal surface. The general process of degreasing cold-rolled steel sheets is to degrease and decontaminate the cold-rolled steel strips with an alkaline degreasing agent, and then rinse them. Ma...

AI Technical Summary

Problems solved by technology

The current rinsing stage is mainly to detect the conductivity and pH value of the rinsing water. The measurement of the conductivity can be used to characterize the concentration of ionizable substances such as alkali and salt in the rinsing water, and the measurement of the pH value can be used to characterize the OH in the rinsing water. - If the concentration of the two exceeds a certain range, it is necessary to consider updating the rinse water. Therefore, these two indicators are used to indicate whether the rinse water needs to be replaced, but cannot represent the rinsing performance of the degreasing agent.

[0005] Linear sweep voltammetry (LSV) is mostly used to study the oxidation-reduction reaction process of electrode surface substances. So far, there has been no literature report on its application to the characterization of the rinsing performance of alkaline degreasing agents.

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