Abstract
ABSTRACTA highly brilliant x-ray beam from a synchrotron radiation source is a powerful tool to perform non-destructive x-ray diffraction analysis of an under-film corroded region of zinc-coated steel sheets. Investigations to identify corrosion products under the outdoor salt-spray test condition and to reveal their one-dimensional distribution were carried out Simonkolleite (ZnCl2•4Zn(OH)2 ) was identified for the first time at the tip of the under-film corroded region. By the one-dimensional analysis, it was shown that the x-ray diffraction intensity of simonkolleite increased, where that of metal zinc decreased. It was suggested that simonkolleite was formed as the first corrosion product under the outdoor salt-spray test condition.
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