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99038 UNDERSTANDING LOCALIZED CO2 CORROSION OF CARBON STEEL FROM PHYSICAL PROPERTIES OF IRON CARBONATE SCALES

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Product Number: 51300-99038-SG
ISBN: 99038 1999 CP
Author: G. Schmitt, M. Mueller, M. Papenfuss, E. Strobel-Effertz
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New data on the fracture mechanical properties (Young’s modulus, fracture stress, fracture strain, internal stress, intrinsic stress, and adhesion) and electrical resistance of iron carbonate scales from CO2 corrosion of carbon steel are reported and discussed with respect to mechanistic considerations on localized attack in CO2 corrosion. The cracking and spalling of iron carbonate scales is primarily due to intrinsic stresses. Inhibitors influence the fracture mechanical properties by reducing the thickness of the scales and their intrinsic growth stresses. FILC is initiated at sites of local spalling if critical flow intensities prevent reformation of protective scales. The electronic conductivity of iron carbonate scales is too low to be considered as site of the cathodic reaction of the electrochemical corrosion process. Key words: carbon steel, carbon dioxide, corrosion, flow effects, iron carbonate scales, fracture mechanical properties, intrinsic stresses, cracking and spalling of scales, critical strains, Young’s modulus, electrical resistance, corrosion inhibitors.
New data on the fracture mechanical properties (Young’s modulus, fracture stress, fracture strain, internal stress, intrinsic stress, and adhesion) and electrical resistance of iron carbonate scales from CO2 corrosion of carbon steel are reported and discussed with respect to mechanistic considerations on localized attack in CO2 corrosion. The cracking and spalling of iron carbonate scales is primarily due to intrinsic stresses. Inhibitors influence the fracture mechanical properties by reducing the thickness of the scales and their intrinsic growth stresses. FILC is initiated at sites of local spalling if critical flow intensities prevent reformation of protective scales. The electronic conductivity of iron carbonate scales is too low to be considered as site of the cathodic reaction of the electrochemical corrosion process. Key words: carbon steel, carbon dioxide, corrosion, flow effects, iron carbonate scales, fracture mechanical properties, intrinsic stresses, cracking and spalling of scales, critical strains, Young’s modulus, electrical resistance, corrosion inhibitors.
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99044 CRITICAL WALL SHEAR STRESSES IN CO2 CORROSION OF CARBON STEEL

Product Number: 51300-99044-SG
ISBN: 99044 1999 CP
Author: G. Schmitt, M. Mueller
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Picture for 04639 Carbonate Cracking Risk Assessment
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04639 Carbonate Cracking Risk Assessment of a FCCU Gas Plant

Product Number: 51300-04639-SG
ISBN: 04639 2004 CP
Author: Monique I. Rivera, Steven R. Bolinger, and Clark L. Wollenweber, Shell Oil Products US
Publication Date: 2004
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This paper provides an introduction on carbonate cracking and Los Angeles refinery’s recent experience with this corrosion mechanism. Also included in this paper is the methodology used for developing a risk assessment for equipment and piping susceptible to carbonate stress corrosion cracking in a fluid catalytic cracking unit (FCCU) gas plant.
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51317--9596-Carbonate SCC Experiences in Unusual Locations

Product Number: 51317--9596-SG
ISBN: 9596 2017 CP
Author: Jeremy Nelson
Publication Date: 2017
$20.00

Cases where alkaline-carbonate stress corrosion cracking (ACSCC) occurred, including a cold wall Fluid Catalytic Cracking (FCC) Unit regenerator and a mercaptan oxidation unit. This paper discusses work done to monitor on-going ACSCC risks through sour water sampling, chemical analysis, and ionic modeling.
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