Effect of organic acid on CO{sub 2} corrosion of carbon and Cr bearing steels

Conference · Thu Dec 31 04:00:00 EST 1998

OSTI ID:350202

Ueda, Masakatsu; Takabe, Hideki ^[1]

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1. Sumitomo Metal Industries, Ltd., Wakayama (Japan). Wakayama Steel Works

The effect of organic acid on CO{sub 2} corrosion of carbon and Cr bearing steels was investigated. Acetic acid was considered as the organic acid. The temperature(T{sub max}), which gave a maximum corrosion rate, was observed on pure iron, and 1 and 2%Cr steels in the CO{sub 2} environment with 0.5% CH{sub 3}COOH as well as in the CO{sub 2} environment without CH{sub 3}COOH. The corrosion rate of these steels at T{sub max} extremely increased due to the addition of 0.5% CH{sub 3}COOH, but the T{sub max} did not change. In 9 and 13% Cr steels, the T{sub max} was observed in the CO{sub 2} environment without CH{sub 3}COOH, but did not in the CO{sub 2} environment with 5% CH{sub 3}COOH, and those corrosion rates continued to increase at the temperature above the T{sub max} in the CO{sub 2} environment without CH{sub 3}COOH. These corrosion behaviors were discussed from a viewpoint of pH and FeCO{sub 3} formation condition which was led from the calculated-equilibrium volubility of FeCO{sub 3} at elevated temperatures. Then, those were related to the acceleration of corrosion at the steel surface with heterogeneous FeCO{sub 3} film in pure iron, and 1 and 2% Cr steels, and the different formation behavior of corrosion products at the temperatures below and above 200 C in 9 and 13% Cr steels.

• OSTI ID: 350202
• Report Number(s): CONF-980316--
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
36 MATERIALS SCIENCE
ACETIC ACID
CARBON DIOXIDE
CARBON STEELS
CHROMIUM STEELS
CORROSION
CORROSION PRODUCTS
CORROSIVE EFFECTS
FIELD PRODUCTION EQUIPMENT
IRON CARBONATES
LOW ALLOY STEELS
PH VALUE