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Method for quickly measuring thickness of metal coating

A metal coating, rapid measurement technology, applied in measuring devices, instruments, etc., can solve the problems of high requirements for laser pulse energy stability, laser beam focusing, difficulty in accurately determining the boundary between coating and substrate, and inability to distinguish between coating and substrate. Achieve the effect of non-destructive rapid detection, accurate and reliable detection results, and consistent ablation per unit pulse

Inactive Publication Date: 2015-02-04
NINGBO ACAD OF SCI & TECH FOR INSPECTION & QUARANTINE
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The measurement of metal coating thickness by LA-ICP-MS has high requirements for the stability of the laser pulse energy and the focusing of the laser beam; It will penetrate each other, and it is still difficult to accurately determine the boundary between the coating and the substrate, and it is impossible to visually distinguish the coating and the substrate, resulting in large deviations in the measurement results

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  • Method for quickly measuring thickness of metal coating
  • Method for quickly measuring thickness of metal coating

Examples

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Effect test

Embodiment 1

[0027] Embodiment one: a kind of method for measuring the thickness of metal coating rapidly, comprises the following steps:

[0028] ① Clean the surface of the sample with analytical pure anhydrous ethanol and air-dry it. The sample is No. 1 hot-dip galvanized steel sheet;

[0029] ② Place the sample in an argon atmosphere with a purity of 99.996%, and use a pulsed laser to ablate the sample in single-point ablation mode. The laser wavelength is 266nm, the pulse width is 30ps, the pulse frequency is 20Hz, and the laser pulse energy is 10μJ. The aperture diameter is 4mm, the defocus distance is 875μm, and the working mode of the pulse laser is fixed pulse working mode;

[0030] ③The ablated sample material is input into the inductively coupled plasma mass spectrometer along with the argon gas for analysis, and the inductively coupled plasma mass spectrometer collects data in the time-resolved analysis mode (TRA) in the peak jump mode to obtain the elements contained in the sam...

Embodiment 2

[0037] Embodiment two: a kind of method for measuring the thickness of metal coating rapidly, comprises the following steps:

[0038] ① Clean the surface of the sample with analytical pure anhydrous ethanol and air-dry it. The sample is No. 2 hot-dip galvanized steel sheet;

[0039] ② Place the sample in an argon atmosphere with a purity of 99.996%, and use a pulsed laser to ablate the sample in single-point ablation mode. The laser wavelength is 266nm, the pulse width is 30ps, the pulse frequency is 20Hz, and the laser pulse energy is 10μJ. The aperture diameter is 4mm, the defocus distance is 875μm, and the working mode of the pulse laser is fixed pulse working mode;

[0040] ③The ablated sample material is input into the inductively coupled plasma mass spectrometer along with the argon gas for analysis, and the inductively coupled plasma mass spectrometer collects data in the time-resolved analysis mode (TRA) in the peak jump mode to obtain the elements contained in the sam...

Embodiment 3

[0047] Embodiment three: a kind of method for measuring the thickness of metal coating rapidly, comprises the following steps:

[0048] ① Clean the surface of the sample with analytical pure ethanol and air-dry it. The sample is a white zinc nut;

[0049] ② Place the sample in an argon atmosphere with a purity of 99.996%, and use a pulsed laser to ablate the sample in single-point ablation mode. The laser wavelength is 266nm, the pulse width is 30ps, the pulse frequency is 20Hz, and the laser pulse energy is 10μJ. The aperture diameter is 4mm, the defocus distance is 875μm, and the working mode of the pulse laser is fixed pulse working mode;

[0050] ③The ablated sample material is input into the inductively coupled plasma mass spectrometer along with the argon gas for analysis, and the inductively coupled plasma mass spectrometer collects data in the time-resolved analysis mode (TRA) in the peak jump mode to obtain the elements contained in the sample material The time-resol...

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Abstract

The invention discloses a method for quickly measuring the thickness of a metal coating. The method for quickly measuring the thickness of the metal coating includes that using a picosecond pulse laser to corrode a sample under such special conditions of single-point corrosion, 20 Hz of pulse frequency and 875 micrometers of defocusing distance, obtaining a time-resolved figure capable of intuitively distinguishing coating metal from base metal through an inductively coupled plasma mass spectrometry, confirming the junction point of the coating metal and base metal in the time-resolved figure so as to confirm the corroding time for corroding the coating metal, using the standard piece of the same coating as a standard to calculate the unit pulse corrosion quantity of the metal coating, and calculating according to the unit pulse corrosion quantity and corrosion time to obtain the coating thickness. The method for quickly measuring the thickness of the metal coating realizes the quick and non-destructive detection for the coating thickness, is not limited by the conductivity of the metal coating and does not require sample shape, and moreover, the method for quickly measuring the thickness of the metal coating is capable of precisely distinguishing the boundary of two layers of metal and high in detection precision.

Description

technical field [0001] The invention relates to a metal coating measurement technology, in particular to a method for quickly measuring the thickness of the metal coating. Background technique [0002] Metal coating can change the appearance of the material, improve corrosion resistance, wear resistance and machining performance, so it is widely used in industries such as automobiles, hardware bathrooms, printed circuit boards, fasteners, stationery, gold and silver jewelry, etc. The thickness of the metal coating has also become an important parameter to characterize its quality. Therefore, the thickness of the metal coating is often measured in product quality inspection, process control and scientific research. [0003] Measuring methods for metal coating thickness, commonly used gravimetric method, coulometric method, X-ray spectroscopic analysis method, eddy current method, magnetic method, metallographic microscope method, scanning electron microscope method, profiler ...

Claims

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Application Information

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IPC IPC(8): G01B21/08
CPCG01B21/08
Inventor 金献忠郭亮张建波陈建国
Owner NINGBO ACAD OF SCI & TECH FOR INSPECTION & QUARANTINE
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