Metal Finishing Guide Book

2011-2012 Surface Finishing Guidebook

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TEST Coating Weight (prior to sealing) Corrosion Resistance TEST METHOD ASTM B137 [Ref. 9] ASTM B117 [Ref. 7] ACCEPTANCE CRITERIA 1,000 mg/ft2 minimum for Type II; 200 mg/ft2 minimum – 1,000 mg/ft2 maximum for Type IIB a. No more than a total of 15 isolated pits, none larger than 0.031 inch in diameter, in a total of 150 square inches of test area grouped from five or more test pieces (areas within 0.062 inch from identification markings, edges and electrode contact marks remaining after processing shall be excluded), and b. No more than 5 isolated pits, none larger than 0.031 inch in diameter, in a total of 30 square inches from one or more test pieces (areas within 0.062 inch from identification markings, edges and electrode contact marks remaining after processing excluded). Wet Tape Adhesion FED-STD-141, Method 6301 [Ref. 8] Dry Tape Adhesion ASTM D3359, Method B [Ref. 10] No intercoat separation between the paint system and anodic coating or the anodic coating and the base metal. No intercoat separation between the paint system and anodic coating or the anodic coating and the base metal. Table 2. Acceptance Criteria for OO-ALC Anodized Parts Sealed with Sodium Dichromate 277

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