Detection and evaluation of surface decolorization on rolled aluminum-magnesium sheets

Abstract

In the aluminum industry providing good quality materials is of utmost importance. Recently, after surface roughness, surface color became a role-playing factor for the customer. Producers require measurable values for classifying the surface decolorization to settle an agreement between the factory and the customer during a complaint. In this study two sources of the surface decolorization are identified in the case of aluminum-magnesium alloy sheets. Based on the results an evaluation scheme is introduced, which analyses the color components of the reflected light from the aluminum-magnesium sheet surface.