Severe localized corrosion of a 316 stainless steel autoclave occurred during investigating Type H Portland cement stability in 0.16 M CaCl2 + 0.02 M MgCl2 + 0.82 M NaCl brine in contact with supercritical CO2 containing 4% O2. The system operated at 85°C and pressure of 29 MPa. However, no corrosion was observed in the same type of autoclave being exposed to the same environment, containing Type H Portland cement cylindrical samples, also operating at pressure of 29 MPa but at 50°C. The operation time for the 85°C autoclave was 53 days (1272 hours) while that for the 50°C autoclave was 66 days (1584 hours). Debris were collected from the base of both autoclaves and analyzed by X-ray diffraction (XRD). Corrosion products were only found in the debris from the 85°C autoclave. The cement samples were analyzed before and after the exposure by X-ray florescence (XRF) methods. Optical microscopy was used to estimate an extent of the 316 stainless steel corrosion degradation.

Subject
Pits, Water, Materials, Metal surfaces, Autoclaves, Solubility, Portland cement, Cement, Brines, Oxygen, Deposit corrosion, Localized corrosion, Stainless steel
Keywords:
Stainless steels, H2O - Cl- - CO2 - O2 environment, localized corrosion
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2012
Association for Materials Protection and Performance (AMPP)
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