Corrosion of the bottom plate on the inner wall of the crude oil storage tank

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We know that the corrosion resistance life of the inner walls of most crude oil storage tanks in refineries is generally around 4-6 years. Since crude oil contains water, which tends to accumulate below a depth of 1 meter, the salt content in this water is relatively high. The main forms of corrosion on the inner wall of the tank bottom are as follows: 1. Corrosion of the inner bottom plate is primarily caused by sulfate-reducing bacteria (SRB), and it takes the form of pitting corrosion; 2. The bottom plate beneath the columns is severely corroded, as a result of both mechanical friction and interstitial electrochemical corrosion ； 3. Electrochemical corrosion resulting in a large cathode and a small anode at the damaged area of the coating ； 4. The corrosion rate of the tank bottom plate can reach 2 mm/year. As a general measure, a comprehensive anti-corrosion approach that combines enhanced coating protection with electrochemical protection can be adopted.