Factors Effect on Aluminum Extrusion Streaking Defect

Usually in anodizing industry the extruded raw profile surface is very shiny and flat, and there is no streaking defect appearance on the surface. However, after anodizing, few streaking defects appear on the surface which reduce the quality of anodized profile surface. These defects are related to the accumulation of impurities that are not visually seen on raw profile surface. This study shows that the selective corrosion of etching solution cause streaking defect appears on the surface. The factors effect on accumulation of impurities on extrusion section surface includes: alloy elements, extrusion dye, surface conditions and dye temperature. In this article we study and control the effect of each variables on aluminum extrusion streaking defect appearance to achieve the desired anodized surface. We also discuss the effects of alloying elements in 6063 alloy, extrusion dye surface and Bilet temperature on the extrusion streaking defect in etching process.

کلیدواژه ها:

Etching ، Alloy elements ، Alloy impurities ، Bilet temperature ، Dye surface