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7/1/2001

Chromate Conversion Coatings and Temperature

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Question: We manufacture small metal parts that are cadmium plated followed by a chromate conversion coating (QQ-P-416, class 2, type II). The parts are ink-jet marked and then baked at 340-400F for 8-30 min to cure the ink markings.

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Question:

We manufacture small metal parts that are cadmium plated followed by a chromate conversion coating (QQ-P-416, class 2, type II). The parts are ink-jet marked and then baked at 340-400F for 8-30 min to cure the ink markings. Will baking the parts at the temperature specified reduce the corrosion resistance of the parts? N.P.

Answer:

I can't give you a definitive answer on this. Normally, exposure of chromate conversion coatings to temperatures in the range you mention will degrade the performance of the corrosion protection. The only way to know for sure is to expose baked and non-baked parts in a salt spray environment and determine if there is a difference in the corrosion protection.

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