Stainless steel and rust
The chromium in stainless steel reacts very quickly with oxygen, and a protective layer of chromium oxide is formed on the surface of the stainless steel after the reaction. Chromium oxide can prevent stainless steel from rusting and corroding.
Why is stainless steel corroded?
Passivated stainless steel
What are descaling and pickling?
But, the problem with this method is that it is not permanent, and because the use of nitric acid at its dangerous concentration is dangerous, few people will reuse it in the brewery. This poses a problem for brewers who deep clean and passivate the metal at least twice a year-how to safely keep the metal clean?
Newer and safer passivation
Passivation of existing equipment
- If possible, please rinse the excess beer stone;
- Add 1-2 ounces of nitric acid/phosphoric acid mixture per gallon and ensure that the pH is 2 or lower. Circulate through the spray ball for at least 15 minutes at the most temperature of 140°F. Do not exceed 140°F (60°C) and keep the nitric acid in the solution instead of being discharged into the air;
- Drain the acid solution, but do not rinse;
- According to the condition of beer stone, add 1-2 ounces per gallon of non-corrosive alkaline detergent, which contains hydrogen peroxide or sodium percarbonate. Use spray ball and heat exchanger to circulate at 120-140°F (50-60°C) for 15-30 minutes;
- Drain the solution. Then immediately execute step 6;
- Use water flushing equipment with the same hot water temperature. You also need to check the pH value of the rinse water and the container wall. When the pH value is neutral, the passivation step is completed;
Passivation of new brewing equipment
- To remove any machine oil, road grime, etc., CIP with a 2 oz. heavy-duty, nonchlorinated liquid-built caustic CIP Cleaner per gallon of hot water (140-180°F) for 15-30 minutes. Drain and then rinse well immediately;
- If there is any surface rust, CIP using a 2 oz. citric acid per gallon of 120-130°F water CIP for 15-30 minutes, then rinses well;
- Immediately after rinsing the citric acid, CIP with a phosphoric/nitric acid blend followed by an oxygenated noncaustic cleaner using the conversion coating passivation steps;
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