Corrosion of pure metals and alloys exposed in geothermal fluids derived from the Ohaaki-Broadlands geothermal resource in New Zealand are reported. Coupon materials of titanium (and two titanium alloys), a zirconium alloy, a cobalt alloy, tantalum and molybdenum were exposed for periods of up to 1 year in two-phase fluid, separated brine, steam, aerated steam, condensate and aerated condensate. The kinetic surface corrosion results are presented and compared and contrasted with practical experience in power station applications.

Subject
Geothermal energy, Water, Materials, Corrosion rate, Mass loss, Molybdenum alloys, Metal coupons, Weight gain, Fluids, Weight loss, Zirconium alloys, Steam, Titanium alloys
Keywords:
Geothermal, Corrosion, Titanium, Zirconium, Cobalt, Tantalum, Molybdenum
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2014
Association for Materials Protection and Performance (AMPP)
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