| Title | Corrosion Inhibition of Acid-Treated Geothermal Brine – Results from Pilot Testing in Southern Negros, Philippines |
|---|---|
| Authors | Alvin I. Remoroza, Elham Doroodchi, Behdad Moghtaderi |
| Year | 2010 |
| Conference | World Geothermal Congress |
| Keywords | Corrosion Inhibitor, Silica Inhibition, pH modification |
| 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. |