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51312-01286-Assessment of Preferential Weld Corrosion of Carbon Steel Pipework in CO2-Saturated Flow-Induced Cor

Picture for Assessment of Preferential Weld Corrosion of Carbon Steel Pipework in CO2-Saturated Flow-Induced Cor
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Product Number: 51312-01286-SG
ISBN: 01286 2012 CP
Author: Richard Barker
Publication Date: 2012
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The performance of two commercially available oilfield corrosion inhibitors in controlling preferential weld corrosion was assessed in CO2-saturated brine in the presence of sand. A submerged impinging jet (SIJ) was utilized to test the carbon steel parent metal and a 1% Ni 0.5% Mo weld material at a temperature of 45°C and sand loading of 500 mg/L. Tests were performed at a velocity of 7 m/s. The galvanic current between the parent metal and weld material were recorded using zero-resistance ammeters and self-corrosion rates of the materials were determined through linear polarization resistance measurements at the end of each test. Additionally AC impedance measurements were performed on the samples to help understand the inhibition processes involved. The galvanic and self corrosion rates for the two materials are compared and reviewed. Fourier-Transform Infrared Spectroscopy was also utilized to verify the extent of inhibitor film formation on the surface of the parent metal and weld material.
The performance of two commercially available oilfield corrosion inhibitors in controlling preferential weld corrosion was assessed in CO2-saturated brine in the presence of sand. A submerged impinging jet (SIJ) was utilized to test the carbon steel parent metal and a 1% Ni 0.5% Mo weld material at a temperature of 45°C and sand loading of 500 mg/L. Tests were performed at a velocity of 7 m/s. The galvanic current between the parent metal and weld material were recorded using zero-resistance ammeters and self-corrosion rates of the materials were determined through linear polarization resistance measurements at the end of each test. Additionally AC impedance measurements were performed on the samples to help understand the inhibition processes involved. The galvanic and self corrosion rates for the two materials are compared and reviewed. Fourier-Transform Infrared Spectroscopy was also utilized to verify the extent of inhibitor film formation on the surface of the parent metal and weld material.
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The work conducted produced conditions where preferential weld corrosion initiated in uninhibited conditions and was sustained throughout inhibition. Two types of weld metallurgies; one weld consumable with 1% nickel, the second matched the parent pipe.
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