ASTM International · 1987
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Reference method for Vickers and Knoop microhardness testing of thin coatings, including hard anodize. Specifies indenter load selection (typically 25-100 gf for hard anodize at 30-75 μm thickness), measurement procedure on metallographic cross-sections, and reporting. Hard anodize microhardness is typically reported as HV50 (Vickers at 50 gf load); properly run hard anodize on 6061 alloy typically achieves >400 HV50.