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Underfilm corrosion of steel sheets observed by confocal 3D-XRF technique

Published online by Cambridge University Press:  29 April 2014

Koji Akioka ,
Takashi Nakazawa ,
Takashi Doi ,
Masahiro Arai  and
Kouichi Tsuji
Koji Akioka*
Affiliation:
Nippon Steel & Sumitomo Metal Corporation1-8 Fuso-cho, Amagasaki, Hyogo 660-0891, Japan
Takashi Nakazawa
Affiliation:
Faculty of Science and Engineering, Chuo University1-13-27, Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan
Takashi Doi
Affiliation:
Nippon Steel & Sumitomo Metal Corporation1-8 Fuso-cho, Amagasaki, Hyogo 660-0891, Japan
Masahiro Arai
Affiliation:
Nippon Steel & Sumitomo Metal Corporation1-8 Fuso-cho, Amagasaki, Hyogo 660-0891, Japan
Kouichi Tsuji
Affiliation:
Graduate School of Engineering, Osaka City University3-3-138, Sugimoto-cho, Sumiyoshi-ku, Osaka 558-8585, Japan
*
a)Author to whom correspondence should be addressed. Electronic mail: akioka.b9m.kohji@jp.nssmc.com
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Abstract

A confocal micro-X-ray fluorescence (XRF) method with a vacuum chamber was used for investigation of underfilm corrosion that occurs on a painted steel sheet used for automotive applications. A painted steel sheet was prepared by applying electrodeposition coating onto an electro-galvanized steel sheet with a zinc phosphate conversion coating. The spatial resolution of the confocal micro-XRF was about 10.9 ?m at an energy of 17.4 keV. The phosphorus signal from the zinc phosphate layer was able to be observed nondestructively by measuring under the vacuum condition. Each layer of the painted steel sheet was observed from the depth profile analysis of the characteristic elements of each layer. The painted steel sheet was scratched to expose the substrate surface, and then the sheet was then immersed in a NaCl solution for 10 days. The in-depth elemental map of Ti of the corroded steel sheet revealed blister-type corrosion around the scratch. The in-depth elemental maps of Zn and P suggested that the zinc phosphate layer dissolved from the scratched part into the NaCl solution.

Keywords

confocal micro-XRFunderfilm corrosion
Type
Technical Articles
Information
Powder Diffraction , Volume 29 , Issue 2 , June 2014 , pp. 151 - 154
Copyright
Copyright © International Centre for Diffraction Data 2014 

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References

Androsch, F. M., Kosters, K., and Stellnberger, K-H. (2001). “Accelerated corrosion tests for corrosion protection systems on steel sheet for the automotive industry,” stahl eisen, 121, 37–46Google Scholar
Gibson, W. M. and Kumakhov, M. A. (1992). “Application of X-ray and neutron optics,” Proc. SPIE. 1736, 172–189.Google Scholar
Hayashi, K., Ito, Y., Kato, C., and Miyoshi, Y. (1990). “Under-film corrosion behavior of zinc and zinc alloy coated steel sheets for automobiles,” Tetsu-to-hagane, 76, 1317–1324.Google Scholar
Kanngiesser, B., Malzer, W., Reiche, I. (2003). “A new 3D micro X-ray fluorescence analysis set-up – first archaeometric applications,” Nucl. Instrum. Method Phys. Res. B 211, 259–264.CrossRefGoogle Scholar
Kojima, R., Okita, H., and Matsushima, Y. (1980). “Fundamental characteristics of zinc phosphate coating,” Tetsu-to-hagane, 66, 924–934.Google Scholar
Nakano, K. and Tsuji, K. (2009). “Nondestructive elemental depth profiling of Japanese lacquerware ‘Tamamushi-nuri’ by confocal 3D X-ray analysis in comparison with micro GE-XRF,” X-Ray Spectrom. 38, 446–450.Google Scholar
Nakano, K. and Tsuji, K. (2010). “Development of laboratory confocal 3D-XRF spectrometer and nondestructive depth profiling,” J. Anal. At. Spectrom. 25, 562–569.Google Scholar
Nakano, K., Nishi, C., Otsuki, K., Nishiwaki, Y., and Tsuji, K. (2011). “Depth elemental imaging of forensic samples by confocal micro-XRF method,” Anal. Chem. 83, 3477–3483.Google Scholar
Nakazawa, T. and Tsuji, K. (2013). “Development of a high resolution confocal micro-XRF instrument equipped with a vacuum chamber,” X-Ray Spectrom. 42, 374–379.Google Scholar
Shastry, C. R. and Townsend, H. E. (1989). “Mechanisms of cosmetic corrosion in painted zinc and zinc-alloy-coated sheet steels,” Corrosion, 45, 103–119.Google Scholar
Tsuji, K. and Nakano, K. (2007). “Development of confocal 3D micro XRF spectrometer with Cr–Mo dual excitation,” X-Ray Spectrom. 36, 145–149.Google Scholar
Tsuji, K. and Nakano, K. (2011). “Development of a new confocal 3D-XRF instrument with an X-ray tube,” J. Anal. At. Spectrom. 26, 305–309.Google Scholar
Tsuji, K., Nakano, K., and Ding, X. (2007). “Development of confocal micro X-ray fluorescence instrument using two X-ray beams,” Spectrochim. Acta Part B 62, 549–553.Google Scholar
Tsuji, K., Yonehara, T., and Nakano, K. (2008). “Application of confocal 3D micro-XRF for solid/liquid interface analysis,” Anal. Sci. 24, 99–103.Google Scholar