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98416 CORROSION OF HIGH TEMPERATURE ALLOYS IN SUPERCRITICAL WATER OXIDATION SYSTEMS

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Product Number: 51300-98416-SG
ISBN: 98416 1998 CP
Author: S. Fodi, J. Konys, J. Hausselt, H. Schmidt, V. Casal
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Supercritical water oxidation (SCWO) is a promising and very effective method for the oxidation of organic wastes. Its high volubility for organic compounds end ita special physical properties (i.e. density, viscosity) resulting in a key advantage over standard processes like incineration. Due to the formation of HCl during oxidation of chlorine orgenics, a severe corrosion attack of most of the materials has been observed. This paper describes the results of investigations of high temperature alloys like alloy No. 214, alloy 602 CA, G-30 alloy alloy 625 end alloy 686, exposed at 400 bar and 420”C for 24 hours in a CH2CQT1202 mixture with about 2000 wppm of chloride. The weight losses of all, samples varied between 3 mg/cm2 for G-30 alloy and about 73 mg/cm2 for alloy 686. The alloy No. 214 showed an increased corrosion for the preoxidized material, whereas the corrosion rate of alloy 602 CA was reduced by a factor of 3 due to the preoxidation at 900°C, prior to SCWO-exposure. The post mortem analysis revealed that alloy 686 has lost most of its nickel down to a depth of about 150 pm. The G-30 alloy showed a good corrosion behavior because of the formation of a protective oxide layer during the exposure. The layer was homogeneous with a thickness of about 12 pm, but a slight nickel leaching was observed, too. Keywords: SCWO, supercritical water, corrosion, oxidation, hydrochloric acid, high temperature, high pressure, nickel base alloys
Supercritical water oxidation (SCWO) is a promising and very effective method for the oxidation of organic wastes. Its high volubility for organic compounds end ita special physical properties (i.e. density, viscosity) resulting in a key advantage over standard processes like incineration. Due to the formation of HCl during oxidation of chlorine orgenics, a severe corrosion attack of most of the materials has been observed. This paper describes the results of investigations of high temperature alloys like alloy No. 214, alloy 602 CA, G-30 alloy alloy 625 end alloy 686, exposed at 400 bar and 420”C for 24 hours in a CH2CQT1202 mixture with about 2000 wppm of chloride. The weight losses of all, samples varied between 3 mg/cm2 for G-30 alloy and about 73 mg/cm2 for alloy 686. The alloy No. 214 showed an increased corrosion for the preoxidized material, whereas the corrosion rate of alloy 602 CA was reduced by a factor of 3 due to the preoxidation at 900°C, prior to SCWO-exposure. The post mortem analysis revealed that alloy 686 has lost most of its nickel down to a depth of about 150 pm. The G-30 alloy showed a good corrosion behavior because of the formation of a protective oxide layer during the exposure. The layer was homogeneous with a thickness of about 12 pm, but a slight nickel leaching was observed, too. Keywords: SCWO, supercritical water, corrosion, oxidation, hydrochloric acid, high temperature, high pressure, nickel base alloys
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98418 THERMOGALVANIC EFFECTS IN CORROSION IN SUPERCRITICAL WATER

Product Number: 51300-98418-SG
ISBN: 98418 1998 CP
Author: Leo B. Kriksunov
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98415 CORROSION PHENOMENA OF ALLOY 625 IN AQUEOUS SOLUTIONS CONTAINING SULFURIC ACID AND OXYGEN UNDER SUBCRITICAL AND SUPERCRITICAL CONDITIONS

Product Number: 51300-98415-SG
ISBN: 98415 1998 CP
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98414 CORROSION Mitigation IN SCWO SYSTEMS FOR HAZARDOUS WASTE DISPOSAL

Product Number: 51300-98414-SG
ISBN: 98414 1998 CP
Author: D.B. Mitton, S-H Zhang, M.S. Quintana, J.A. Cline, N. Caputy, P.A. Marrone, R. Latanision
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