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Aluminum Oxide, Hardness
The image to the right shows a cross section of a hard anodic coating with Vickers indentations and thickness measurements.
The pyramid has to be square formed to be sure of hardness value measured.
The light blue to the left is the aluminum alloy and the dark to the right in the picture is the resin.THE MILITARY SPECIFICATION, MIL-A-8625F, for “Anodic Coatings for Aluminum and Aluminum Alloys” says nothing about any requirements of the hardness of Type III – Hard Anodic Coatings, see earlier post about this subject here.The European Standard EN 12373 ”Aluminium and aluminium alloys – Anodizing” has none either. Both of them have on the other hand requirements of a wear resistance of the coating.
The maximum wear index for coatings on aluminum alloys having a copper content of 2 % or higher is of 3.5 mg/1000 cycles and 1.5 mg/1000 cycles for all other alloys.
Next post will discuss the wear resistance versus the hardness of hard anodic oxide coatings.
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