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topic 32516

50% Nitric heated solution color


We have recently switched from 20% nitric passivation at room temperature to a 50% Nitric at 120 deg F. We have noticed some changes in the solution that were not anticipated. We cleaned the plastic tanks with denatured alcohol as before. The new solution is yellowish not clear to bluish tint as before. Is this due to the increase of concentration? The increase in temperature? or could it be a reaction with the alcohol?

The important thing is that we are passing the CuSO4 test. But the smell, evaporation rate, color, and concentration are safety concerns that we would like to be knowledgeable of.

Kevin Dodd
Medical device Manufacturing - Austin, Texas

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