Comparison of current reversal chronopotentiometry (CRC) and small amplitude cyclic voltammetry (SACV) method to determine the long-term corrosion tendency of copper-nickel alloys in polluted and unpolluted seawater under jet-impingement conditions
- Reda (Mahmoud R.), Burlington, Ontario (Canada)
- Kuwait Univ., Safat (Kuwait)
The cyclic current reversal chronopotentiometry (CRC) technique is utilized to determine the long-term corrosion tendency of UNS C70600 and UNS C71500 copper-nickel alloys in sulfide polluted and unpolluted seawater. The CRC results were compared with the corrosion tendency obtained by the modified linear polarization method small amplitude cyclic voltammetry (SACV) over a long exposure time and the results are in agreement for both C70600 and C71500 alloys. This contradicts the conclusions on the effects of sulfide on copper-nickel alloys by many previous investigators who misinterpreted the sharp active shift in potential as an indication of increase in corrosion rate. For an active/passive alloy such as C71500 a higher amplitude current per cycle is required (e.g., 100 {micro}A/20 seconds) in the CRC method and under jet-impingement conditions, while a lower amplitude current per cycle (e.g., 1{micro}A/20 seconds) is required for an alloy that does not exhibit active/passive behavior. The CRC technique was found to be unsuccessful in screening out the long-term corrosion tendency of copper alloys in polluted and unpolluted sea water and under stagnant or stirred conditions (i.e., non-jet-impingement conditions).
- OSTI ID:
- 570180
- Report Number(s):
- CONF-9511298-; ISBN 0-8031-2025-7; TRN: IM9808%%41
- Resource Relation:
- Conference: 2. Symposium on corrosion testing in natural waters, Norfolk, VA (United States), 7 Nov 1995; Other Information: PBD: 1997; Related Information: Is Part Of Corrosion testing in natural waters: Second volume; Kain, R.M. [ed.] [LaQue Corrosion Services, Wrightsville Beach, NC (United States)]; Young, W.T. [ed.] [Corrpro Companies, Inc., West Chester, PA (United States)]; PB: 167 p.; ASTM special technical publication 1300
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effects of environment on localized corrosion of copper-based, high-level waste container materials
Erosion-corrosion resistance of copper alloy C72200 in seawater containing entrained sand