| 摘要 |
PROBLEM TO BE SOLVED: To provide an anticorrosive method by which the manifestation of a discoloration is suppressed as much as possible when crude sulfuric acid or crude phosphoric acid adheres to the wall surfaces of tanks, and safety of such tanks is ensured for a long period of time, and in addition, an acid cleaning treatment in the tanks can be omitted. SOLUTION: In the tank which stores/transports crude sulfuric acid and crude phosphoric acid, a non-corrosive gas such as dry air, a rare gas, carbon dioxide and an engine exhaust gas is filled or passed. To suppress, the discoloration of the tank wall surfaces.
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