| 摘要 |
PURPOSE:To measure the iron concentration and galvanized layer thickness during the plating of an alloyed zinc galvanized steel plate, by determining steel plate, by determining X ray diffraction intensities of (200) face in GAMMA and alpha-Fe phase individually with specified lattice surface intervals to collate the relationship predetermined between the both diffraction strengths and the Fe concentration. CONSTITUTION:A parallel beam optical system X ray diffraction unit is used and the X ray diffraction intensity in the GAMMA phase with the lattice surface interval of 1.22Angstrom continuously measured with one measuring device about the galvanized layer of an alloyed zinc galvanized steel plate. The diffraction intensity in the GAMMA phase increases with the Fe concentration but will not be directly proportional to the galvanized layer thickness. On the other hand, the diffraction intensity of the (200) face is inversely proportional to the galvanized layer thickness and hence, the galvanized layer thickness can be determined regardless of the Fe concentration in the galvanized layer. Thus, chart as illustrated showing the relationship between the galva nized layer thickness in terms of the (200) face, the X ray diffraction intensity in the GAMMA phase and the Fe concentration determined by measurement using the known sample is used to enable simultaneous measurement of the Fe concentration and the galvanized layer thickness during the plating non-destructive accurately with one unit.
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