Molybdenum foil’s appearance varies based on processing, surface treatment, and environmental exposure. 1) Color: Freshly made foil is silver-white with metallic luster, highly reflective when polished; after air exposure or slight oxidation, it may appear gray-white or light black-brown. 2) Surface Condition: Polished foil is smooth (roughness Ra<0.1 μm), used in semiconductor targets; acid-washed foil is clean but slightly rough (Ra 0.5-1 μm), suited for furnaces; as-rolled foil has fine rolling marks and a duller surface. 3) Shape and Size: Typically rectangular or circular, with thicknesses of 0.01-2 mm, widths of 10-1000 mm, and customizable lengths, featuring smooth or slightly burred edges (requiring trimming). 4) Flatness: High-precision foil has flatness deviation <0.05 mm/m, ideal for precision applications; standard foil may have slight waviness. 5) Defects: High-quality foil is free of visible scratches, cracks, or pores; lower-quality foil may have minor oxidation spots or rolling defects. 6) Environmental Impact: Prolonged air exposure may form a thin oxide layer, appearing black-brown, dulling luster. Appearance is controlled via visual inspection, surface roughness testing, and microscopic analysis to meet electronics and aerospace standards. Polishing and inert atmosphere storage maintain ideal appearance.
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