Anti-corrosion treatment for the inner wall of the liquid caustic storage tank under the vault
Thread Content
I have just designed two storage tanks for NaOH: one with a capacity of around 4000 m3, containing 40% NaOH at 40 degrees Celsius, and another with a capacity of around 4000 m3, containing 5% NaOH at 40 degrees Celsius. These are dome-shaped tanks made of carbon steel. After reading an article on the forum titled “Corrosion of Equipment by Liquid Caustic”, I’m not quite sure about concepts such as primary passivation – how is it carried out? The equipment will be manufactured on-site. What kind of corrosion might occur above the liquid level? Please give me some guidance. Thank you!
Personally, I don’t think anti-corrosion measures are necessary, as steel can achieve good protection by passivating in hot alkaline solutions to form a passive film.
I’m referring to the part above the liquid level line, such as the inner wall of the arch?