What stainless steel sheets are resistant to acidic corrosion?
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The material used for the cylinder body of our plant’s desulfurization absorption tower is ordinary carbon steel, with a phosphated anti-corrosion coating on the inner wall of the cylinder. The anti-corrosion coating often peels off, and the cylinder body is corroded by acidic slurry, leading to leakage. We now intend to install stainless steel protective linings on the inner wall of the cylinder; therefore, we would like to know what types of stainless steel sheets are resistant to acidic corrosion I would appreciate the advice of experts.
We are the M310 and ZeCor materials provided by Monsanto! Imported materials are just more durable! However, improper control of the parameters can also lead to acid leakage, especially on the side of the second absorption stage
It is necessary to indicate the acid concentration and temperature; the corrosion properties of concentrated acids and dilute acids are different, with a significant gap between them!
316L is one of the stainless steels with the best resistance to sulfuric acid corrosion. It exhibits good corrosion resistance at sulfuric acid concentrations below 15% or above 85%, but carbon steel is generally used at higher concentration levels.
What is the structure of the phosphated anti-corrosion coating? There might also be issues with the materials used and the anti-corrosion design
Typically, the structure of a desulfurization absorption tower is a steel-lined scale structure; if the steel surface is not properly treated during the lining process, the so-called delamination problem occurs. If a composite steel plate structure is to be used, the inner layer can be made of 316L, which exhibits good corrosion resistance against dilute acids and wet sulfur dioxide. However, when using 316L or other stainless steels, it is necessary to control the chloride ion content in the absorbing solution, as well as to take into account the presence of fluoride ions, which can be detrimental to stainless steel. This post was last edited by opendoor on 2009-2-9 18:26]