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Effect of Solution pH on Corrosion Product Layer Formation in a Controlled Water Chemistry System

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The primary objective of this study was to investigate iron carbonate (FeCO3) formation mechanisms on ferritic-pearlitic carbon steel corroding in a CO2 saturated aqueous solution near iron carbonate saturation, with particular emphasis on the effect of solution pH.

Product Number: 51317--9160-SG
ISBN: 9160 2017 CP
Author: Supat IEAMSUPAPONG
Publication Date: 2017
Industry: Science of Corrosion
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Most CO2 corrosion experiments are conducted at high levels of supersaturation with respect to iron carbonate in a glass cell. This leads to more rapid attainment of steady state with respect to corrosion rate and corrosion product formation. However most operating conditions in an upstream pipeline do not match with these ‘easily tested’ conditions. To better simulate internal pipeline environments found in field conditions a flow-through system was used to control the water chemistry by maintaining saturation values with respect to iron carbonate for the entire testing time. All experiments were conducted on UNS G10180 mild steel at 80?C pCO2 of 0.53 bar and velocity of 0.6 m/s in 1wt.% NaCl electrolyte within a pH range of 5.4-6.0. The evolution of the corrosion process was continuously monitored by electrochemical methods. Scanning electron microscopy (SEM/EDS) was used as the main characterization tool to study the corrosion product layers on the surface and in cross-section. It was found that similar corrosion product layers and corrosion rates are observed in pH range of 5.4-6.0. The ending corrosion rates indicate that the higher solution pH tends to give slightly better protection to the steel surface. Under the controlled water chemistry the lower solution pH condition needs a thicker Fe3C layer which acts as diffusion boundary layer in order have high enough “intrasurface” pH to nucleate FeCO3.Keywords: solution pH controlled water chemistry flow-through system Fe3C FeCO3

Key words: Solution pH, Controlled water chemistry, FeCO3; Carbon steel

Most CO2 corrosion experiments are conducted at high levels of supersaturation with respect to iron carbonate in a glass cell. This leads to more rapid attainment of steady state with respect to corrosion rate and corrosion product formation. However most operating conditions in an upstream pipeline do not match with these ‘easily tested’ conditions. To better simulate internal pipeline environments found in field conditions a flow-through system was used to control the water chemistry by maintaining saturation values with respect to iron carbonate for the entire testing time. All experiments were conducted on UNS G10180 mild steel at 80?C pCO2 of 0.53 bar and velocity of 0.6 m/s in 1wt.% NaCl electrolyte within a pH range of 5.4-6.0. The evolution of the corrosion process was continuously monitored by electrochemical methods. Scanning electron microscopy (SEM/EDS) was used as the main characterization tool to study the corrosion product layers on the surface and in cross-section. It was found that similar corrosion product layers and corrosion rates are observed in pH range of 5.4-6.0. The ending corrosion rates indicate that the higher solution pH tends to give slightly better protection to the steel surface. Under the controlled water chemistry the lower solution pH condition needs a thicker Fe3C layer which acts as diffusion boundary layer in order have high enough “intrasurface” pH to nucleate FeCO3.Keywords: solution pH controlled water chemistry flow-through system Fe3C FeCO3

Key words: Solution pH, Controlled water chemistry, FeCO3; Carbon steel

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