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Corrosion studies in brines of the Salton Sea geothermal field.

Carter JP; McCawley FX; Cramer SD; Needham PB Jr.
Avondale, MD: U.S. Department of the Interior, Bureau of Mines, RI 8350, 1979 Jan; :1-35
Toward the goal of maximizing minerals and metals recovery from domestic resources, the Bureau of Mines, U.S. Department of the Interior, has conducted in situ corrosion studies at the Salton Sea Known Geothermal Resources Area (KGRA) in the Imperial Valley, California, to evaluate and characterize materials of construction for geothermal resources recovery plants. General-, pitting, and crevice-corrosion characteristics of 13 commercially available alloys were investigated for periods of 15 and 30 days in seven process environments expected to be found in typical geothermal resources plants. Stainless steel alloy 29-4, inconel 625, and the hastelloys g, s, and c-276 were the most resistant to general corrosion, did not pit, and exhibited little susceptibility to crevice corrosion. Stainless steel alloys 430, e-brite 26-1, and 6x had low general corrosion rates, but pitted and were susceptible to crevice corrosion. Stainless steel alloy 316 l had a low corrosion rate, but corroded intergranularly, pitted, and was susceptible to crevice corrosion and to stress-corrosion cracking. Titanium-1.5 Nickel and ticode-12 had low corrosion rates, did not pit, and were not susceptible to crevice corrosion. Carbon and 4130 steels had high corrosion rates, pitted, and had high susceptibilities to crevice corrosion. The major scale-forming mineral on the corrosion samples in most of the process environments studied was galena mixed with lesser amounts of other minerals.
Brines; Corrosion; Corrosion tests; Geothermal fluids; Nickel alloys; Salton Sea Geothermal Field; Stainless steels; Steel 1020; Steel 316L; Steel 4130; Steels; Titanium alloys
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Avondale, MD: U.S. Department of the Interior, Bureau of Mines, RI 8350
Page last reviewed: September 4, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division