Abstract
In a previous study, the analysis of solid blue paints for a truck using scanning electron microscopy with energy dispersive X-ray analysis (SEM/EDX) was reported. By this analysis, Cl, Ti and Cu were detected and the X-ray intensity ratios of ClKα/TiKα and CuKα/TiKα had enough reproducibility and these ratios should be useful to discriminate solid blue paints.
In this study, model paints which were manufactured by using 8 kinds of phthalocyanine blue pigment and one kind of white titanium pigment, were supplied from Nippon Paint Corp. and were analyzed by this method.
Cl and Cu were originated from chlorinated copper phthalocyanine. Ti was originated from titanium dioxide. And it was indicated that these X-ray intensity ratios of ClKα/TiKα and CuKα/TiKα in model paints have linear relations with the weight ratio of blue organic pigment to white pigment. Furthermore, the X-ray intensity ratio of ClKα/CuKα in model paints showed the chlorination of chlorinated copper phthalocyanine. Coefficients of variation of the ratios were within 20 even in the case where examined paints were collected from a smear on a rough surface.
The method was validated by model paints with measured data.
