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The last edit to this post was made by Wang Wei2 on 2025-11-5 at 07:37. The corrosion-resistant materials for storing and transporting sulfuric acid are as follows: 1) Concentrated sulfuric acid with a concentration of 93%–100% and fuming sulfuric acid with a concentration of over 102% can be stored and transported using carbon steel tanks, barrels, and containers； 2) Sulfuric acid with a concentration of 75%–93%, which is moderately low in concentration; it should be stored and transported using steel equipment, with anti-corrosion measures applied to its inner walls for protection ； 3) Dilute sulfuric acid with a concentration of 75% or less should be stored and transported in storage tanks and tank cars made of fiberglass-reinforced plastic. In addition to the selection of corrosion-resistant materials and the rational design of the structure mentioned above, other measures can also be taken for the anti-corrosion and operational safety of sulfuric acid tanks, such as reducing the flow rate of sulfuric acid, employing electrochemical protection, applying passivation, using protective coatings, and strengthening and improving the management of tank operations. 1) Change the flow state of sulfuric acid. Due to the fact that the corrosion resistance of carbon steel in sulfuric acid depends on a protective layer of ferrous sulfate formed on its surface, this resistance significantly diminishes when this protective layer is damaged; as a result, the corrosion rate increases dramatically. To protect this protective film, the flow rate of sulfuric acid must be strictly controlled; generally, it should be kept within 50 mm/s ； 2) Electrochemical protection. It is mainly the anodic protection method. After applying anodic protection, the corrosion rate of carbon steel in sulfuric acid is significantly reduced ； 3) Use of thermal insulation coatings. Since the corrosiveness of sulfuric acid increases with rising temperatures, in order to prevent the temperature of the sulfuric acid inside the tank from rising due to sunlight, the outer wall of the tank should be coated with a light-colored (usually white) topcoat, or heat-reflective coatings that are currently very popular can be used ； 4) Strengthen management. Concentrated sulfuric acid has a very strong hygroscopic property. When carbon steel storage tanks are regularly filled with concentrated sulfuric acid, corrosion is minimal. However, if the tanks are often emptied (for example, during frequent shutdowns and after being left unused for long periods), the thin layer of concentrated sulfuric acid attached to the inner walls of the carbon steel tank will quickly absorb moisture from the air and become diluted, resulting in severe corrosion of the carbon steel that can even lead to perforations. It is also very necessary to strengthen the management of venting from carbon steel tanks containing concentrated sulfuric acid, to reduce the venting time, or to adopt other management measures such as dehumidification.