Effect of microstructure on corrosion of steels in aqueous solutions containing carbon dioxide

Journal Article · Mon Jun 01 04:00:00 EDT 1998 · Corrosion

DOI:https://doi.org/10.5006/1.3284876· OSTI ID:619576

Al-Hassan, S ^[1]; Mishra, B; Olson, D L ^[2]; Salama, M M ^[3]

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1. Inst. of Paper Science and Technology, Atlanta, GA (United States)
2. Colorado School of Mines, Golden, CO (United States)
3. Conoco, Inc., Ponca City, OK (United States)

The influence of microstructure on the corrosion rate of steels in a carbon dioxide (CO{sub 2})-containing aqueous solution was measured experimentally as a function of pH, temperature, and partial pressure of CO{sub 2}. An attempt was made to quantify and relate the microstructure to the corrosion rate. The effect of alloy microstructure was increasingly evident at temperatures up to 60 C but diminished above 60 C. The corrosion rate increased with temperature in the activation-controlled regime, where a nonprotective iron carbonate (FeCO{sub 3}) scale formed. Diffusion-controlled corrosion through a stable scale of iron hydroxycarbonate (Fe{sub 2}[OH]{sub 2}CO{sub 3}) was responsible for lowering the corrosion rate above 60 C. Under a diffusion-controlled corrosion mechanism, microstructure of the steel had no effect on corrosion rate.

• Sponsoring Organization: USDOE
• OSTI ID: 619576
• Journal Information: Corrosion, Journal Name: Corrosion Journal Issue: 6 Vol. 54; ISSN 0010-9312; ISSN CORRAK
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACTIVATION ENERGY
AQUEOUS SOLUTIONS
CARBON DIOXIDE
CARBON STEELS
CORROSION
CORROSIVE EFFECTS
IRON CARBONATES
MICROSTRUCTURE