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Coating Weight & Conversion Efficiency

From METALAST International, Inc.

The conversion efficiency of an anodizing process, one of the performance criteria, is defined as the percentage of the weight (WC) of anodic coating produced over the theoretical weight of the aluminum oxide calculated from Faraday's law. The higher the conversion efficiency, the better the performance of the anodizing process. The conversion efficiency of the MLT-II & III processes was determined on the most commonly used materials and provided in this spec. Accordingly, the coating weight on each alloy was determined as well. Four pre-weighed coupons (4" x 4") of each alloy were anodized to 0.7 mil and 1.5 mil under the MLT-II and MLT-III conditions, respectively. The anodized coupons were dried in an oven, then weighed after cooling to room temperature, and stripped in accordance with MIL-A-8625F to determine the coating weight produced and aluminum consumed during the anodizing process with the precision of 3%. The following table presents the conversion efficiency and the coating weights resulting from the METALAST process. It is specified by MIL-A-8625F that at least 1000 mg/ft2 is required for Type-II coatings and a minimum weight of 4320 mg/ft2 is required for Type-III coatings.
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