Reductive deposition of heavy metals, arsenic, antimony and antimony-silver alloys has been observed in acidic geothermal waters; two-phase and brine solutions. These waters may be corrosive to carbon steel but observed corrosion rates appear to be accelerated by the presence of reductively deposited heavy metals. Electrochemical testing has proved difficult because of the formation of gases on these metals under cathodic polarisation. This work is focused on laboratory coupon exposures that aim to characterize contributing factors that influence the rate of corrosion of carbon steel under ion beam sputter deposited coatings of heavy metals in pressurized simulated geothermal brines. Preliminary results to prove the methodology are presented.

Subject
Pits, Pressure vessels, Geothermal energy, Coatings, Materials, Antimony, Steel coupons, Heavy metals, Localized pitting, Acidity, Brines, Carbon steel, Duplex stainless steel
Keywords:
Geothermal, galvanic corrosion, arsenic, antimony, carbon steel
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2016
Association for Materials Protection and Performance (AMPP)
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