Green Corrosion Inhibitors in High Temperature and Saline Geothermal Fluids

Abstract

Geothermal energy is heat derived from deep inside of the earth’s surface, this geothermal energy is carried via water or streams through pipes from deep sub-surface and bought to the earths ground where with the help of various post processing techniques we can use this geothermal energy for warming and refrigeration purpose or else this energy can be utilized to form clean electric energy. The major concern while carrying out geothermal fluid is of corrosion, due to fluid temperature and salinity, internal corrosion can be observed. Not only internal corrosion can be exploded we can even see corrosion of external piping and vessels at geothermal fields. To overcome this internal corrosion effect, plant extracts can be used as a green corrosion inhibitor. Plant extracts can become important as an environment friendly, nontoxic, readily available and can be easily renewed. Tannins which are a class of natural, innocuous and economical polyphenolic compound can be easily extracted from plant sources such as pine (Pinus sp.), Quebracho (Scinopsis balansae), Quercus robur, Pomegranate peels and certain amount of its concentration can be added in acidic medium and can be used as corrosion inhibitor for geothermal fluids. We can inhibit the effect of these plant extracts (by selecting the right concentration) on steel corrosion in geothermal fluid using Gravimetric method.