A method for evaluating the polymerization performance of organic coatings on color-coated boards

Abstract

The invention discloses an evaluation method for the polymerization performance of a color coated plate organic coating. The method is characterized by: firstly soaking a color coated steel plate sample in an electrolyte solution to conduct pretreatment, then conducting AC impedance testing and analyzing the measured AC impedance spectrum, then performing formula computation to obtain the coating porosity, and evaluating the polymerization performance through the porosity. Specifically, the pretreatment time of the color coated steel plate sample is 60-90min, the temperature of the electrolyte solution is 23-27DEG C in the pretreatment process, the electrolyte solution is a sodium oxide aqueous solution with a concentration of 3.0-5.0% by mass percentage, and the AC impedance measurement adopts a three-electrode system, a working electrode is a to-be-tested sample, the area ratio of an auxiliary electrode to the working electrode is 2-4, the scanning speed is 0.1-1.0mV / S, the amplitude of a sine voltage signal is 10-40mV, and the scanning frequency range is 1*10<5>Hz-1*10<-2>Hz.

Description

technical field [0001] The invention belongs to the technical field of iron and steel anticorrosion, and in particular relates to a method for evaluating the performance of an organic coating on a color-coated plate. Background technique [0002] The excellent anti-corrosion and decorative properties of color-coated steel sheets are achieved by obtaining a coating with good adhesion on the surface of the substrate. The coating has good formability, corrosion resistance and decorative properties of organic polymers, among which corrosion resistance It is a performance that directly affects the service life of color-coated plates. The quality of corrosion resistance depends on whether the formed organic coating can effectively isolate the corrosive medium from the substrate or slow down the speed at which the corrosive medium reaches the substrate and causes corrosion. It penetrates into the coating through the micropores on the surface of the coating and reaches the coating / b...

AI Technical Summary

Problems solved by technology

[0004] (1). The test results and grade evaluation are greatly affected by objective test conditions and human factors;

[0005] (2). The test period is long, which affects the efficiency of product performance evaluation

Images