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An R & D program was initiated at Omega Research Inc. to determine the effects of a rubber vulcanizing curing cycle on epoxy prime adhesion. Primary test program objectives were to quantify the effects, if any, on adhesion of Mil-P-23377 primer to chem film and anodize surfaces previously exposed to a 2 hour temperature cycle at 370 deg. F.
Processing and Test Sequencing:
Step 1) Chem film treat panels - Set #1 Anodize panels
- Set # 2 (Type I & 2 and Nickel acetate seal).
Prior questions have been raised in the metal finishing industry on the adhesion of epoxy primer on chem film and/or anodized aluminum panels that had been exposed to an elevated temperature rubber vulcanizing cure cycle at 370 deg. F. prior to priming 2024-T3 aluminum panels processed according to the sequence noted above were tested.
A) The chem film treated aluminum panels showed no
loss in primer adhesion.
The mechanism of adhesion loss in the anodized coatings cannot be determined by the scope of this report. Potential causes could be dehydration of the sealed anodized, changed morphology of the anodize surface or other electromotive surface changes affecting the epoxy bond.
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