On-line coating adhesion determination apparatus of galvannealed steel sheet, and galvannealed steel sheet manufacturing line
View Patent ↗An on-line coating adhesion determination apparatus of a galvannealed steel sheet, includes: an X-ray tube which irradiates a galvannealed steel sheet that travels on a transportation line, with X-rays; an optical system which allows the X-rays emitted from the X-ray tube to irradiate the galvannealed steel sheet as a parallel beam and be diffracted; and a detector which measures the intensity of the diffracted X-rays and is installed at a position at which the X-ray diffraction peak corresponding to a crystal lattice spacing d of 1.5 Å or higher is detected, in which an emitted beam luminance of the X-rays is 20 W/mm 2 or higher, and the width-direction gain of the X-rays in the optical system is 0.15 or higher. The crystal lattice spacing d may be 1.914 Å. In addition, the energy of the incident X-rays from the X-ray tube may be lower than the excitation energy of Fe-Kα fluorescence X-ray.
1. An on-line coating adhesion determination apparatus of a galvannealed steel sheet, comprising:
an X-ray tube which irradiates a galvannealed steel sheet that travels on a transportation line, with X-rays;
an optical system which allows the X-rays emitted from the X-ray tube to irradiate the galvannealed steel sheet as a parallel beam and be diffracted; and
a detector which measures an intensity of the diffracted X-rays and is installed at a position at which a X-ray diffraction peak corresponding to a crystal lattice spacing d of 1.5 Å or higher is detected,
wherein an emitted beam luminance of the X-rays is 20 W/mm2 or higher, and a width-direction gain of the X-rays in the optical system is 0.15 or higher.
2. The on-line coating adhesion determination apparatus of a galvannealed steel sheet according to claim 1 ,
wherein the detector is installed at a position at which a X-ray diffraction peak corresponding to a crystal lattice spacing any one of d of 1.507 Å, 1.536 Å, 1.623 Å, 1.720 Å, 1.833 Å, 1.899 Å, 1.914 Å, 1.971 Å, 2.363 Å, 2.593 Å, 2.770 Å, 3.692 Å, 4.109 Å, 5.535 Å, or 6.351 Å is detected.
3. The on-line coating adhesion determination apparatus of a galvannealed steel sheet according to claim 1 ,
wherein, as the X-ray tube, an X-ray tube in which an energy of the X-rays incident on the galvannealed steel sheet is lower than an excitation energy of Fe-Kα fluorescence X-rays, is used.
4. A galvannealed steel sheet manufacturing line comprising:
the on-line coating adhesion determination apparatus according to claim 1 which is installed at a position at which a sum of a sheet thickness change and steel sheet vibrations is within ±3 mm between an alloying furnace and coiling.
5. The on-line coating adhesion determination apparatus of a galvannealed steel sheet according to claim 2 ,
wherein, as the X-ray tube, an X-ray tube in which an energy of the X-rays incident on the galvannealed steel sheet is lower than an excitation energy of Fe-Kα fluorescence X-rays, is used.
6. A galvannealed steel sheet manufacturing line comprising:
the on-line coating adhesion determination apparatus according to claim 2 which is installed at a position at which a sum of a sheet thickness change and steel sheet vibrations is within ±3 mm between an alloying furnace and coiling.
7. A galvannealed steel sheet manufacturing line comprising:
the on-line coating adhesion determination apparatus according to claim 3 which is installed at a position at which a sum of a sheet thickness change and steel sheet vibrations is within ±3 mm between an alloying furnace and coiling.