Metal Finishing Guide Book

2012-2013

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374 ACCEPTANCE CRITERIA 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 ASTM D3359, Method B [Ref. 10] Dry Tape Adhesion ASTM B117 [Ref. 7] Corrosion Resistance No intercoat separation between the paint system and anodic coating or the anodic coating and the base metal. 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). ASTM B137 [Ref. 9] Coating Weight (prior to sealing) Wet Tape Adhesion FED-STD-141, Method 6301 [Ref. 8] 1,000 mg/ft2 minimum for Type II; 200 mg/ft2 minimum ��� 1,000 mg/ft2 maximum for Type IIB TEST METHOD TEST

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