Localized corrosion testing of CRA materials in elevated temperature sour gas environments
- Cortest Labs. Ltd., Sheffield (United Kingdom)
- Qatar General Petroleum Corp., Doha (Qatar)
An exposure test program has been undertaken to investigate the localized corrosion resistance of Alloys 28, 825, G3 and 625 in two simulated sour gas environments at 150 C. The chloride levels in these test environments, containing 30 psi (0.21 MPa) H{sub 2}S and 101 psi (0.70 MPa) CO{sub 2}, were 150 ppm and 30,000 ppm. The general corrosion rate of each material was found to be negligible in each test. Alloy 825 alone was susceptible to minor pitting and crevice initiation in the 150 ppm chloride environment. Increasing the chloride level to 30,000 ppm resulted in more severe crevice attack of Alloy 825 and crevice corrosion of Alloy 28. Alloys G3 and 625 were not susceptible to localized corrosion in either test environment. The exposure tests were supported by complementary electrochemical polarization curves in the low chloride environment. The curves did not exhibit clearly defined passive regions, which were masked by additional anodic current from the oxidation of H{sub 2}S.
- OSTI ID:
- 696963
- Report Number(s):
- CONF-990401--
- Country of Publication:
- United States
- Language:
- English
Similar Records
HIP clad nickel base Alloy 625 for deep sour wells
Effect of alloy nickel content vs PREN on the selection of austenitic oil country tubular goods for sour gas service