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In-Process Coating Layer Analysis of Galvannealed Steel Sheets with Monochromatic Incident X-Rays

Published online by Cambridge University Press:  06 March 2019

Hiroharu Kato,
Kiyotaka Imai and
Hideya Tanabe
Hiroharu Kato
Affiliation:
Electronics Research Center NKK Corporation Kawasaki, Japan
Kiyotaka Imai
Affiliation:
Electronics Research Center NKK Corporation Kawasaki, Japan
Hideya Tanabe
Affiliation:
Electronics Research Center NKK Corporation Kawasaki, Japan
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Abstract

A new method, for the on-line determination of the composition and the coating weight of galvannealed (Zn-Fe-alloy-coated) steel sheets using monochromatic incident x-rays with two optical systems, is described. In the case of galvannealed steel sheets, it is difficult to determine the composition and the coating weight precisely by simple XRF, because fluorescent x-rays of Iron are emitted not only from the coating layer but also from the underlying steel sheets. We have developed an on-line analyzer with two optical systems which are different in incident angles, take-off angles and wavelengths of monochromatic incident x-rays. We determine the composition and the coating weight by solving simultaneous equations of the data which we derive using two optical systems. Using monochromatic x-rays enabled us to obtain high precision with high speed. We considered en-or factors in on-line measurement such as statistical error or fluctuation of the distance between the sensor head and steel sheets. This on-line analyzer has been applied to the continuous galvanizing line in our Fukuyama works successfully. As a result, we have been able to significantly improve product quality.

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References

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