Abstract：In order to ensure the anti-corrosion property of depleted uranium bar surface to meet the requirements, it is necessary to accurately measure the thickness of nickel coating and zinc coating on the product surface. Protable X-ray fluorescence spectrometry (PXRF) was used to detect the thickness of the double coatings on the surface of depleted uranium bar, and the nondestructive measurement of the thickness of nickel coatings and zinc coatings was realized. The coating samples with uniform intensity distribution of characteristic spectral lines and the depleted uranium matrix samples without coating were selected and detected by PXRF. The results showed that the matrix rays had no interference with the detection spectral lines. The samples with the same thickness of nickel coating and different thickness of zinc coating, the samples with the same thickness of zinc coating and different thickness of nickel coating, and the samples with different thickness of nickel coating and zinc coating were selected for detection by PXRF. The results showed that the experimental method could identify the nickel coating and zinc coating with different thickness on the same substrate, and it could realize the simultaneous measurement of the thickness of two coatings in the nickel zinc composite coating. According to the structural characteristics of depleted uranium bar samples and the technical requirements for the thickness of nickel coating and zinc coating, the comparison samples were designed and prepared. The calibration curves between the thickness of nickel coating and zinc coating of depleted uranium bar samples and the corresponding characteristic peak intensity were fitted. The results showed that the linear correlation coefficients (r) of the calibration curves were not less than 0.999 4. The thickness of nickel coating and zinc coating on the surface of depleted uranium bar sample was measured according to the experimental method. At the same time, six testing points were uniformly taken on any circumference, and the average value was obtained by the metallographic microscope method. The relative standard deviations (RSD,n=6) were not more than 5.1%. The results showed that measurement results of the experimental method were basically consistent with those obtained by the metallographic microscope method. The difference between two methods was -1.57-1.70 μm.
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