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Title: Corrosion Behavior of Alloy 22 in Chloride Solutions Containing Organic Acids

Alloy 22 (N06022) is a nickel based alloy containing alloying elements such as chromium, molybdenum and tungsten. It is highly corrosion resistant both under reducing and under oxidizing conditions. Electrochemical studies such as electrochemical impedance spectroscopy (EIS) were performed to determine the corrosion behavior of Alloy 22 in 1M NaCl solutions at various pH values from acidic to neutral at 90 C. Tests were also carried out in NaCl solutions containing oxalic acid or acetic acid. It is shown that the corrosion rate of Alloy 22 was higher in a solution containing oxalic acid than in a solution of the same pH acidified with HCl. Acetic acid was not corrosive to Alloy 22. The corrosivity of oxalic acid was attributed to its capacity to form stable complex species with metallic cations from Alloy 22.
Authors:
; ; ;
Publication Date:
OSTI Identifier:
881895
Report Number(s):
UCRL-CONF-216907
TRN: US200613%%183
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Presented at: CORROSION/2006 Conference and Exposition, San Diego, CA, United States, Mar 12 - Mar 16, 2006
Research Org:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ACETIC ACID; ALLOYS; CAPACITY; CATIONS; CHLORIDES; CHROMIUM; CORROSION; IMPEDANCE; MOLYBDENUM; NICKEL; ORGANIC ACIDS; OXALIC ACID; PH VALUE; SPECTROSCOPY; TUNGSTEN