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Effect of Aggressive Substance on the Nature of Corrosion Scales Formation on Super 13Cr Stainless Steel in Formate Completion Fluid

Product Number: 51321-16311-SG
Author: Xiaoqi Yue/ HangCao/ Lei Zhang/MinxuLu/LeiMa/Mifeng Zhao/Yong Hua
Publication Date: 2021
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The nature of corrosion scales formed on super 13Cr stainless steel surface after exposure in formate completion fluid inthe presence ofvarious aggressive substances was investigated by a combination of surface characterization techniques such as SEM/EDS, XRD, Raman,etc. The results indicatedthat the corrosion products mainly comprised Fe3O4for super 13Cr exposed to KCOOH at 180°C under N2environments. However,the addition of CO2progressively increased the general corrosion rate, suggestingthat the calculatedhigh corrosion rates were attributed to the presence of CO2in the systemtested. The formationof FeCr2O4and Cr(OH)3weredetected intheinner corrosion product layersand the precipitation of blade-shapediron carbonate (FeCO3) was detected in the outer layer on the super 13Cr stainless steel surface.The resultssuggestedthatthe outer corrosion product layer showedless corrosion protectivenesscompared to the formation of nano-polycrystallineFeCr2O4and Cr(OH)3inner layers,based on itsless compact and observed gaps between crystals from the SEM images. The presence of Sulfuron the metallic surfacesin both N2and CO2environmentscaused the increase in material degradation.

Keywords:Potassium formate, super 13Cr stainless steel, high temperature,CO2, sulfide

The nature of corrosion scales formed on super 13Cr stainless steel surface after exposure in formate completion fluid inthe presence ofvarious aggressive substances was investigated by a combination of surface characterization techniques such as SEM/EDS, XRD, Raman,etc. The results indicatedthat the corrosion products mainly comprised Fe3O4for super 13Cr exposed to KCOOH at 180°C under N2environments. However,the addition of CO2progressively increased the general corrosion rate, suggestingthat the calculatedhigh corrosion rates were attributed to the presence of CO2in the systemtested. The formationof FeCr2O4and Cr(OH)3weredetected intheinner corrosion product layersand the precipitation of blade-shapediron carbonate (FeCO3) was detected in the outer layer on the super 13Cr stainless steel surface.The resultssuggestedthatthe outer corrosion product layer showedless corrosion protectivenesscompared to the formation of nano-polycrystallineFeCr2O4and Cr(OH)3inner layers,based on itsless compact and observed gaps between crystals from the SEM images. The presence of Sulfuron the metallic surfacesin both N2and CO2environmentscaused the increase in material degradation.

Keywords:Potassium formate, super 13Cr stainless steel, high temperature,CO2, sulfide

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