I have noticed a black dust on the bottom of new SS tanks. The new tanks are passivated with nitric acid. As instructed I let the tanks air dry. After that I have cleaned and sanitized (CIP) the tanks with a mix of caustic and clorine. Now I have noticed a black dust when wiping the bottom of the tank. I thought it could be carbon which comes from the stainless steel (304) or ?
If it is a result from the nitric acid treatment the CIP might not work so well on the bottom of the tank.
I have not seen this dust on used tanks which are treated in the same manner with nitric acid.
If it is a result from the nitric acid treatment the CIP might not work so well on the bottom of the tank.
I have not seen this dust on used tanks which are treated in the same manner with nitric acid.
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