A method for measuring the weight of pretreatment film of color-coated board

Abstract

The invention relates to a color-coated plate, in particular to a pretreatment method for detecting a color-coated plate. A method for measuring the pretreatment film weight of a color-coated plate, which comprises the following steps: a sample sealing step: adopting a rubber sample dissolving cup with an inner diameter with a large upper and a lower bottom to seal the non-measurement surface; the stripping step of the sample: using hydrochloric acid-hexamethyl Tetraamine corrosion inhibition system, the pretreatment film is peeled off together with the coating, and the substrate itself is not corroded and dissolved at this time; the digestion sample step: use nitric acid and hydrogen peroxide wet digestion to transfer all the components to be measured into the solution to make a test solution; pretreatment film weight measurement steps: use ICP-AES or FAAS method to measure the pretreatment film weight of the color-coated board. The method of the invention has the advantages of simple and convenient sample sealing, accurate measurement results, and the prepared measurement solution can meet the requirements of certain measurement techniques (such as ICP-AES, FAAS, etc.) to measure the weight of the pretreatment film.

Description

technical field [0001] The invention relates to a color-coated plate, in particular to a pretreatment method for detecting a color-coated plate. Background technique [0002] The currently commonly used method for measuring the weight of the pretreatment film on the color-coated board is: use scotch tape to seal the non-measurement surface, dissolve the pre-treatment film on the color-coated board with hydrochloric acid, and then boil it with hydrogen peroxide for 30 minutes to measure the thickness of the pre-treatment film. This method has the following defects: the sealing of the sample is more complicated, and it is easy to cause the over-corrosion of the sample due to the penetration of the edge of the non-measurement surface due to improper operation; The components dissolve, resulting in a high measured value of the film weight, which affects the measurement accuracy; because hydrogen peroxide is used as a digestive agent in this method, the digestion capacity is redu...

AI Technical Summary

Problems solved by technology

This method has the following defects: the sealing of the sample is more complicated, and it is easy to cause the over-corrosion of the sample due to the penetration of the edge of the non-measurement surface due to improper operation; The ingredients are dissolved, resulting in a high film weight measurement value, which affects the measurement accuracy; because hydrogen peroxide is used as a digestive agent in this method, the digestion capacity is reduced due to the decomposition of hydrogen peroxide during the heating process, and the digestion time becomes longer.

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