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Overview of Phosphoric Acid Corrosion

Phosphoric Acid Corrosion is an acidic environment "disease" largely associated with polymerization units using phosphoric acid as a catalyst. Dry phosphoric acid catalyst is not corrosive to carbon steel, but wet phosphoric acid can corrode carbon at thousands of mils per year. This type of corrosion can often be found in dead zones and crevices where wet acid can drop out. In places where water is present, upgrading to 304L, 316L, or Alloy 20 may be necessary to prevent this type of corrosion, depending on the temperature.[1]




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