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51315-5450-Comparison of the Corrosion Protection Effectiveness of Vapor Corrosion Inhibitor and Nitrogen Blanketing System

Product Number: 51315-5450-SG
ISBN: 5450 2015 CP
Author: Behzad Bavarian
Publication Date: 2015
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Corrosion behavior of steel samples used for storage tanks and cross casing pipe applications were investigated using two different protection mechanisms: vapor corrosion inhibitor and nitrogen blanketing system. The objective of this project was to demonstrate which technique provides more protection in corrosive environments especially where there are restricted geometries such as crevices threads notches and under-deposits.Corrosion behavior of steel samples were studied in two different conditions; the first contained 200 ppm chloride solution + 10% corrosion inhibitor addition the second included 200 ppm chloride solution with a nitrogen blanketing system at 10 psi applied pressure. The corrosion rate of the exposed samples were monitored for more than five months (~3600 hours) using linear polarization resistance (LPR) and electrical resistance (ER) probe techniques.The corrosion data have demonstrated that vapor phase corrosion inhibitors have superior advantages over the nitrogen blanketing system in the presence of excessive salt and moisture. On average the LPR corrosion rate measured less than 0.06 mpy for samples immersed in VCI solution no sign of corrosion was observed. The immersed and nitrogen blanketing samples in contrast showed a corrosion rate of 1.68 mpy and the samples were covered with a thick red rust. ER probes showed a corrosion rate of 0.18 mpy for VCI treated while the nitrogen blanketing samples showed a 2.12 mpy corrosion rate and probes were heavily corroded. It is interesting to report that when VCI was injected into the nitrogen blanketing corrosion cell the corrosion rate of the corroded steel probes dropped to less than 0.26 mpy in under 20 hours. This shows a significant reduction in the corrosion rate by more than eight times.
Corrosion behavior of steel samples used for storage tanks and cross casing pipe applications were investigated using two different protection mechanisms: vapor corrosion inhibitor and nitrogen blanketing system. The objective of this project was to demonstrate which technique provides more protection in corrosive environments especially where there are restricted geometries such as crevices threads notches and under-deposits.Corrosion behavior of steel samples were studied in two different conditions; the first contained 200 ppm chloride solution + 10% corrosion inhibitor addition the second included 200 ppm chloride solution with a nitrogen blanketing system at 10 psi applied pressure. The corrosion rate of the exposed samples were monitored for more than five months (~3600 hours) using linear polarization resistance (LPR) and electrical resistance (ER) probe techniques.The corrosion data have demonstrated that vapor phase corrosion inhibitors have superior advantages over the nitrogen blanketing system in the presence of excessive salt and moisture. On average the LPR corrosion rate measured less than 0.06 mpy for samples immersed in VCI solution no sign of corrosion was observed. The immersed and nitrogen blanketing samples in contrast showed a corrosion rate of 1.68 mpy and the samples were covered with a thick red rust. ER probes showed a corrosion rate of 0.18 mpy for VCI treated while the nitrogen blanketing samples showed a 2.12 mpy corrosion rate and probes were heavily corroded. It is interesting to report that when VCI was injected into the nitrogen blanketing corrosion cell the corrosion rate of the corroded steel probes dropped to less than 0.26 mpy in under 20 hours. This shows a significant reduction in the corrosion rate by more than eight times.
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