To indicate the corrosion rates that can be expected in transport lines for supercritical CO2, a typical pipeline steel has been exposed to CO2 saturated water, and to water saturated with CO2 at high pressure. The experiments were performed at 40 deg C and pressures from 10 to 90 bars. It was found that carbon dioxide is non-corrosive as long as it is dry. The slightest water wetting gives corrosion. Water droplets on the steel surface leads to shallow corrosion attacks filled with corrosion products that grow out from the steel surface. In water saturated with CO2 at high pressure, the corrosion rate is high, but far less than expected from extrapolation based on existing CO2 corrosion models. In all experiments, the corrosion rate was less than 20 mm/y. This can partly be explained by accumulation of corrosive products during the experiments at CO2 fugacity below 30 bar. At higher CO2 fugacity, other corrosion mechanisms seem to operate and that results in corrosion rates that decrease with pressure.
Corrosion of pipeline steel in supercritical CO2 / water mixtures
2000
9 Seiten, 9 Bilder, 22 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
Pipeline-Transport , Rohrleitung , Korrosion , Rohrstahl , Kohlendioxid , superkritische Strömung , Wasser , Feuchte , Korrosionsmechanismus , gesättigte Flüssigkeit , Hochdruck (Mechanik) , Korrosionsprodukt , Emission (Schadstoff) , Umweltschutz , Löslichkeit , Gaskorrosion , Gaslösevermögen , Gastransport
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