Active dissolution and natural passivation of carbon steel in carbon dioxide-loaded alkanolamine solutions
- Teikoku Oil Co., Ltd., Tokyo (Japan)
Corrosion rates of carbon steel specimens were measured in carbon dioxide(CO{sub 2})-loaded alkanolamine(amine) solutions by weight-loss tests and by the polarization resistance method. In dilute amine solutions, lower than 10{sup {minus}2} M, corrosion rates were controlled by the formation of protective FeCO{sub 3} scale as in hot, CO{sub 2}-H{sub 2}O environments. Tested amines inhibited CO{sub 2} induced corrosion in the concentration range between 10{sup {minus}2} and 2M. In concentrated amine solutions, higher than 3M, primary and tertiary amines showed markedly different effects on carbon steel corrosion. The corrosion rates of carbon steel rose with the increase in primary amine concentration, whereas the corrosion rates of carbon steel stayed low in tertiary amine solutions even at 6M, due to the formation of protective FeCO{sub 3} scale. Tertiary amines absorb CO{sub 2} as HCO{sub 3}{sup {minus}} in the presence of water. On the contrary, primary amines absorb CO{sub 2} by two ways. One is as HCO{sub 3}{sup {minus}} like tertiary amines, and the other is direct absorption of CO{sub 2} without water, producing amine-carbamate. The chemical substances produced due to the absorption of CO{sub 2} by amines are considered to play important roles not only on corrosion rates but also on the morphology and protectiveness of corrosion products.
- OSTI ID:
- 271989
- Report Number(s):
- CONF-960389-; TRN: IM9635%%416
- Resource Relation:
- Conference: National Association of Corrosion Engineers (NACE) annual corrosion conference and exposition: water and waste water industries, Denver, CO (United States), 24-29 Mar 1996; Other Information: PBD: 1996; Related Information: Is Part Of Corrosion/96 conference papers; PB: [6615] p.
- Country of Publication:
- United States
- Language:
- English
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