Coating thickness test method

Abstract

The invention discloses a coating thickness test method. According to the method, a sample to be tested is made into a sample block of which the coating area can be accurately calculated; a coating onthe sample block is completely digested with strong acid, so that a test solution of a certain volume can be prepared; the content of a coating metal component in the solution is measured by an inductively coupled plasma optical emission spectrometer; the mass of the coating component is calculated; and the thickness of the coating is calculated on the basis of the measured area of the sample block. The test method of the invention has the advantages of high test accuracy, strong representativeness, less interference, small error, and wide test coating thicknesses range. With the coating thickness test method adopted, the thickness of the coating can be tested in general chemical laboratories, and professional thickness gauges are not required.

Description

【Technical field】 [0001] The invention relates to a method for testing the thickness of a coating, in particular to a method for measuring the thickness and composition of the coating by chemically digesting the coating and using an inductively coupled plasma emission spectrometer. 【Background technique】 [0002] Coating is a thin layer of metal or other elements plated on the surface of certain items in order to look good or change the properties of certain items. Its main functions are: 1. Improve the corrosion resistance of metal parts in the use environment; 2. Decorate parts 3. Improve the working performance of parts, such as hardness, wear resistance, electrical conductivity, electromagnetic properties, heat resistance, etc. [0003] The thickness and composition of the coating determine the physical properties of the coating. Too thick a coating will cause the coating to be rough in appearance and easy to peel off, and the coating cannot withstand collisions during h...

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Problems solved by technology

[0012] The patent document (Application No.: 201410609442.6 A method for quickly measuring the thickness of metal coatings) introduces a method for measuring metal coatings using a pulsed laser series inductively coupled plasma mass spectrometer, and calculates the coating thickness according to the unit pulse ablation amount and ablation time. Although it is fast, it needs to make high-precision standard parts to measure, and it is also a single-point or several-point measurement, which cannot reflect the thickness of the coating as a whole, nor can it measure the composition of the coating;

[0013] The patent document (application number: 201410609442.6 a method for measuring the coating on the surface of the substrate) uses an electron microscope to measure the thickness of the coating, and at the same time uses an energy spectrometer to measure the composition of the coating. This method also has certain defects. In the energy spectrometer, there are some The characteristic spectral lines of the elements are similar and interfere with each other, which is not conducive to the accurate characterization of the components

[0014] There is also Gong Shuqing (the method for measuring the thickness of tinplate coating by atomic absorption, physical and chemical inspection (chemical volume), 03 phase in 1995) adopts the method for measuring the thickness of tinplate coating by atomic absorption, this method only measures a kind of metal coating method, and does not Able to measure multiple metal coatings at the same time;

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