Abstract
Chemical coversion with chromium-free compounds for aluminum alloy surface preparation that is ecologically importannt is different from chomium chmeical conversion because substrate surface has not remarkable color after the treatment. Therefore, simplified daily quality control measure has to be established for practical use. In this paper, a kind of the chromium-free preparation that mainly includes zircon is experimentally discussed. Main results are as follows. (1)60 degrees gross with gross meter is possible to be measured after the treatment. It is clear that surface gross of aluminum substrate declines with the treatment. (2)If color difference is measured with color meter, Δb value is changed to plus side. It is judged that Δb value is possible to be applied to the daily qulity control. (3)Applying portable fluorescence X-ray micro analyzer is possible to detect increaseing of zircon. However, it is necessary to examine still more.
