Can a tank used for storing concentrated nitric acid also be used to store dilute nitric acid after it has been used to store concentrated nitric acid?
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I’m seeking advice from experts: My company has several horizontal tanks made of aluminum-magnesium alloy, which were used for storing concentrated nitric acid in the past; there is still a small amount of residue left. As the weather gets hotter, the decomposition and evaporation of concentrated nitric acid increase, and there is a risk that the corrosion of the tank may occur once the concentration of the material drops. I would appreciate the insights of those with more experience.
Concentrated nitric acid (concentration > 98%) is generally stored in containers made of aluminum alloy. If the remaining nitric acid concentration is below 80%, it is recommended to store it in containers made of stainless steel, such as those made of 304 material, or 316L material as well. However, for 316L, the temperature should preferably not exceed 60 degrees.