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Help CenterCommonly Used Aluminum Sacrificial Anodes for Drilling Platforms, High-temperature Resistant Aluminum Anodes
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Commonly used aluminum sacrificial anodes for drilling platforms, high-temperature resistant aluminum anodes
The corrosion inside the storage tank is related to factors such as the type, nature, composition, temperature, and replacement frequency of the stored medium. Whether storing liquid or gas, there are two corrosion environments, one is the gas phase, and the other is the liquid phase. For media such as crude oil storage, the liquid phase is further divided into two layers, one is the oil layer, and the other is the sedimentary water layer at the bottom.
(1) The top of the tank and the upper part of the tank wall
This part is not in direct contact with the oil products and belongs to gas-phase corrosion. In essence, it still belongs to electrochemical corrosion.
(2) Liquid-phase corrosion in the middle of the tank wall
In the middle of the vertical tank wall, the tank wall is in direct contact with the oil products. Since most of the water in the oil products is deposited at the bottom, the corrosion in this part is light. The corrosion forms are the chemical corrosion of the oil products and the electrochemical corrosion of the electrolytes contained in the oil products. Most of the electrolytes in the oil products are carried during the stirring process of transportation.
(3) Corrosion of the lower part of the storage tank and the inner wall of the tank bottom
The outer wall of the storage tank is in three environmental states: one is exposed to the atmosphere; the second is covered with an insulation layer and exposed to the atmosphere; the third is the soil environment. Therefore, there are three forms of corrosion: atmospheric corrosion, corrosion after the insulation layer is soaked in water, and soil corrosion. This part is the key area of internal corrosion of the storage tank, and its manifestation is electrochemical corrosion.
The corrosive medium is the water layer formed by the moisture carried during the storage and transportation of oil products and the condensation of water vapor in the gas phase. Sometimes, rainwater leaks through the perforated tank top. Over time, if the drainage is not timely, a layer of water will accumulate at the bottom of the tank. Sometimes, during the long-distance closed transportation process, the crude oil normally contains water. Due to the fear of losses during the transportation process, people are reluctant to discharge the water, which makes the water layer permanently stored at the bottom of the tank.
Since the tank bottom sits on the asphalt sand surface, the action of the oxygen concentration difference battery, stray current corrosion, and the galvanic corrosion caused by the contact between the tank bottom plate and the lightning protection system and the steel bars in the concrete all accelerate the corrosion rate of the outer bottom plate of the tank.
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