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Measurement method of nonferromagnetic metal coating layer thickness on nonferromagnetic metal

A non-ferromagnetic, measurement method technology, applied in the field of measurement, can solve the problem that the conductivity of the base metal cannot be changed, and cannot meet the requirements and limitations of use.

Active Publication Date: 2017-03-15
NUCLEAR POWER INSTITUTE OF CHINA
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Problems solved by technology

This method requires that the conductivity of the base metal cannot change. For the case of changes in the conductivity of the base metal, the measurement results will have large errors, which cannot meet the requirements of use and are no longer applicable; in addition, the frequency sweep method requires the use of uncoated In some cases, such as when measuring the coating thickness of three or more metals, the uncoated substrate is not easy to obtain or should not be exposed to the circulating air, the application of this method will be will be restricted

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  • Measurement method of nonferromagnetic metal coating layer thickness on nonferromagnetic metal

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Embodiment

[0029] A method for measuring the thickness of a non-ferromagnetic metal coating on a non-ferromagnetic metal, comprising the following steps:

[0030] (a) Calibration step: use the eddy current phase method to measure the calibration phase corresponding to the different known coating thicknesses of different calibration test pieces, and establish the corresponding relationship between the calibration phase and the coating thickness;

[0031] (b) Actual measurement step: adopt the same eddy current phase method as step (a), measure the test phase corresponding to the coating layer of the object to be measured, the conductivity of the coating layer of the calibration test piece is the same as that of the coating layer of the object to be measured And the relative conductivity deviation between the matrix of the calibration test piece and the matrix of the object to be measured is less than or equal to 50%. According to the corresponding relationship between the calibration phase...

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Abstract

The invention discloses a measurement method of a nonferromagnetic metal coating layer thickness on nonferromagnetic metal. The method comprises the following steps of (a) a calibration step: using an eddy current phase method to measure calibration phases corresponding to different known coating layer thicknesses of different calibration test pieces and establishing a corresponding relation of the calibration phases and the coating layer thicknesses; (b) an actual measurement step: using a eddy current phase method which is the same with the method in the step (a) to measure a tested phase corresponding to a coating layer of an object to be measured, and according to the corresponding relation of the calibration phases and the coating layers, which is acquired from the step (a), calculating a coating layer thickness of the object to be measured. A measurement demand when a current conductivity difference is small and a matrix metal conductivity is changed in a certain range is satisfied.

Description

technical field [0001] The invention belongs to the field of measurement technology, and in particular relates to a method for measuring the thickness of a non-ferromagnetic metal coating layer on a non-ferromagnetic metal by using an eddy current phase method. Background technique [0002] When the base metal is coated with a thin coating, it is important to measure the thickness of the coating. When the conductivity of the coating is significantly different from that of the base metal, such as when both the base metal and the coating metal have an electrical conductivity at least 1.5 times that of the other metal, the thickness of the coating is measured as Carried out by general methods, such as the phase-sensitive eddy current method. However, when coating certain base metals, there is only a slight difference in conductivity between the base metal and the coating metal, for example, in both the base metal and the coating metal, the conductivity of one metal is less tha...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/06
CPCG01B7/105
Inventor 李冬许贵平王学权万宇吴婧
Owner NUCLEAR POWER INSTITUTE OF CHINA
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