Corrosion behavior of 20# steel in aqueous CO2 solution under stratified gas-liquid two-phase flow condition
Anti-Corrosion Methods and Materials
ISSN: 0003-5599
Article publication date: 11 October 2018
Issue publication date: 24 January 2019
Abstract
Purpose
This paper aims to investigate the corrosion rate, surface morphology and composition of corrosion products of 20# seamless steel in aqueous CO2 solution under stratified gas-liquid two-phase flow condition. The development of a corrosion products layer has also been discussed.
Design/methodology/approach
The following methods were used: weight loss method, scanning electron microscopy, energy-dispersive X-ray spectroscopy and X-ray diffraction.
Findings
The corrosion rate curve presents an irregular zigzag change trend with a gradual increase in time. The peak value of the corrosion rate appears when the corrosion time is 4 h and 8 h. The corrosion products layer is composed of two sub-layers: the inner dense layer that is about 6 µm thick and the outer loose layer that is about 9 µm thick when the corrosion time is 8 h. The main corrosion product are FeCO3 and Fe2O3.
Originality/value
The atomic ratio of Fe/C/O is relatively stable for the inner dense layer, but changes in thickness for the outer loose layer. There is a densification stage after a loose corrosion products layer forms, and it is periodic.
Keywords
Acknowledgements
The authors would like to acknowledge the financial support for this research provided by the National Natural Science Foundation of China (Grant No.51765035), Scientific Research Project for Higher School of Gansu Province of China (Grant No. 2017A-015).
Citation
Yang, G., Song, W., Wang, F., Ma, Y. and Hao, Y. (2019), "Corrosion behavior of 20# steel in aqueous CO2 solution under stratified gas-liquid two-phase flow condition", Anti-Corrosion Methods and Materials, Vol. 66 No. 1, pp. 11-18. https://doi.org/10.1108/ACMM-06-2018-1950
Publisher
:Emerald Publishing Limited
Copyright © 2018, Emerald Publishing Limited