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Corrosion Behavior of Alloy 22 in Oxalic Acid and Sodium Chloride Solutions.

DE200415007541

Publication Date	2003
Personal Author	Day, S. D.; Whalen, M. T.; King, K. J.; Hust, G. A.; Wong, L. L.; Estill, J. C.; Rebak, R. B.
Page Count	26
Abstract	Nickel based Alloy 22 (N06022) is extensively used in aggressive industrial applications, especially due to its resistance to localized corrosion and stress corrosion cracking in high chloride environments. The purpose of this work was to characterize the anodic behavior of Alloy 22 in oxalic acid solution and to compare its behavior to sodium chloride (NaC1) solutions. Standard electrochemical tests such as polarization resistance and cyclic polarization were used. Results show that the corrosion rate of Alloy 22 in oxalic acid solutions increased rapidly as the temperature and the acid concentration increased. Extrapolation studies show that even at a concentration of 10(sup -4) oxalic acid, the corrosion rate of Alloy 22 would be higher in oxalic acid than in 1 M NaCl solution. Alloy 22 was not susceptible to localized corrosion in oxalic acid solutions. Cyclic polarization tests in 1 M NaCl showed that Alloy 22 was susceptible to crevice corrosion at 90 degrees Celsius but was not susceptible at 60 degrees Celsius.
Keywords	Nickel based alloys Corrosion Sodium chlorides Oxalic acids Polarization Electrochemistry Pressure vessels Cracking Extrapolation Stress corrosion
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Livermore National Lab., CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200505

Corrosion Behavior of Alloy 22 in Oxalic Acid and Sodium Chloride Solutions.

Corrosion Behavior of Alloy 22 in Oxalic Acid and Sodium Chloride Solutions.
DE200415007541

Publication Date	2003
Personal Author	Day, S. D.; Whalen, M. T.; King, K. J.; Hust, G. A.; Wong, L. L.; Estill, J. C.; Rebak, R. B.
Page Count	26
Abstract	Nickel based Alloy 22 (N06022) is extensively used in aggressive industrial applications, especially due to its resistance to localized corrosion and stress corrosion cracking in high chloride environments. The purpose of this work was to characterize the anodic behavior of Alloy 22 in oxalic acid solution and to compare its behavior to sodium chloride (NaC1) solutions. Standard electrochemical tests such as polarization resistance and cyclic polarization were used. Results show that the corrosion rate of Alloy 22 in oxalic acid solutions increased rapidly as the temperature and the acid concentration increased. Extrapolation studies show that even at a concentration of 10(sup -4) oxalic acid, the corrosion rate of Alloy 22 would be higher in oxalic acid than in 1 M NaCl solution. Alloy 22 was not susceptible to localized corrosion in oxalic acid solutions. Cyclic polarization tests in 1 M NaCl showed that Alloy 22 was susceptible to crevice corrosion at 90 degrees Celsius but was not susceptible at 60 degrees Celsius.
Keywords	Nickel based alloys Corrosion Sodium chlorides Oxalic acids Polarization Electrochemistry Pressure vessels Cracking Extrapolation Stress corrosion
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Livermore National Lab., CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200505