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The Effect of Different Polyaniline Types in Silicon Dioxide Containing Coatings for Carbon Steel Protection in Artificial Geothermal Brines

Carbon steel is non-resistant to uniform and pitting corrosion in geothermal brines and high alloyed materials which exhibit excellent performance are relatively costly. Coating systems become an alternative to protect carbon steel from corrosion in the geothermal environment. In this research a coating system consisting of polyaniline and silicon dioxide was optimized by investigating differently synthesized polyaniline types in the coating regarding their protective effect on carbon steel. SEM images of the phosphoric acid and dodecylbenzenesulfonic acid doped polyaniline showed different morphology which suggested different physical and chemical properties. The geothermal brine found in Indonesia was simulated by an artificial solution with pH 4 containing 1500 mg/l Cl- 20 mg/l SO42- 15 mg/l HCO3- 200 mg/l Ca2+ 250 mg/l K+ and 600 mg/l Na+. Evaluation of the coating system was performed by surface analysis of the exposed specimens and electrochemical tests i.e. electrochemical impedance spectroscopy (EIS) and open circuit potential (OCP) at 150 °C with 1 MPa pressure. Visual assessment of exposed specimens with single component addition into coatings (polyaniline or silicon dioxide) showed that coatings underwent degradation. Therefore a combination of pigments addition was investigated in the tested geothermal brine to observe the improvement of corrosion protection.Key words: geothermal coating polyaniline corrosion

Product Number: 51319-13121-SG
Author: Gabriela Aristia
Publication Date: 2019
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