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11273 Effect of Inhibition on the Pitting Stability and Growth Kinetics of 316 Stainless Steel in an Acetic Acid Storage Tank

Picture for 11273 Effect of Inhibition on the Pitting Stability and Growth Kinetics of 316 Stainless Steel
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Product Number: 51300-11273-SG
ISBN: 11273 2011 CP
Author: Raymundo Case and Dale McIntyre
Publication Date: 2011
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A 316L stainless steel tank storing inhibited acetic acid perforated due to pitting corrosion after less than 1 year in service. This paper presents potentiodynamic polarization, potentiostatic and galvanostatic test results using reagent grade solutions compared to acid from the field. Chlorides in the corrosion inhibitor proved to be the primary cause of the pitting corrosion, which led to severe pitting damage at the weld heat-affected zones. Various preventive measures (cathodic protection) were tested in the laboratory. The primary preventive measure applied was to remove the inhibitor from the acid blend.

Keywords: pitting corrosion, inhibitor composition effects, and pit kinetics.
A 316L stainless steel tank storing inhibited acetic acid perforated due to pitting corrosion after less than 1 year in service. This paper presents potentiodynamic polarization, potentiostatic and galvanostatic test results using reagent grade solutions compared to acid from the field. Chlorides in the corrosion inhibitor proved to be the primary cause of the pitting corrosion, which led to severe pitting damage at the weld heat-affected zones. Various preventive measures (cathodic protection) were tested in the laboratory. The primary preventive measure applied was to remove the inhibitor from the acid blend.

Keywords: pitting corrosion, inhibitor composition effects, and pit kinetics.
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