Corrosion Inhibition of Acid-Treated Geothermal Brine – Results from Pilot Testing in Southern Negros, Philippines
- Key words
- Corrosion Inhibitor, Silica Inhibition, pH modification
- Location
- Palinpinon, Philippines; Negros
- Conference
- World Geothermal Congress
- Year
- 2010
- Session
- 27. Corrosion and Scaling
- Language
- English
- Paper number
- 2740
Full text
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Abstract
Corrosion inhibition testing of carbon steel pipe with acid-treated brine using chemical organic inhibitor was conducted at Nasuji Sector, Southern Negros Geothermal Production Field, Philippines. Brine at 160 C was acid treated to reduce the pH from ~7 to ~ 4.5 and then cooled to 120 C to simulate temperature drop from a second flash system. The acid was introduced to effect pH modification of brine chemistry to delay polymerization of silica and/or prolong the induction time.
Corrosion rates were monitored using linear polarization measurement probes before and after addition of sulfuric acid. Weight-loss method of measuring corrosion rates was also used by installing metal coupons. The experiment was run for more than 30 days.
Corrosion inhibition of carbon steel with acid-treated brine using 10 ppm organic chemical inhibitor proved that it can substantially reduce corrosion rates.
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