What is passivation?

According to ASTM-A967, there are several definitions for passivation, depending on the
 specific application. The following is most appropriate for the tank cleaning industry:
 “Passivation is the chemical treatment of stainless steel with a mild oxidant, such as a
nitric acid solution, for the purpose of enhancing the spontaneous formation of the 
protective passive film. Such chemical treatment is generally not necessary for the 
formation of the passive film.”

At times the transportation of certain types of materials will compromise the chromium oxide passive film of the stainless steel. Once this occurs, passivation is required. But prior to passivation, all superficial rust must be removed. Rather than performing a passivation procedure several times, which can be quite costly and time consuming, consider that the chromium oxide is already compromised, or not at all present. Hence, the application of John-Henry GO-pHER® via John-Henry® Simplicity Fogger will aid in rust removal, leaving the stainless steel tank so clean that it might appear pristine.

Passive-8 is applied to a freshly washed and rinsed tank at the rate of 1 1/2 gal. per
 1000 gallons of tank capacity. After it is dispensed through the John-Henry® Simplicity Fogger, a process that takes about 3 minutes per gallon, the product is allowed to stand for an additional 45 minutes, and then flushed out with water. In a multi-compartment tank, the same formula applies per compartment.

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