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Study on hydrogen permeation behavior of X80 steel under AC stray current interference

Ailing Wang (PetroChina Sichuan Petroleum Administration, Chengdu, China)
Yong Deng (PetroChina Sichuan Petroleum Administration, Chengdu, China)
Kaihong Li (PetroChina Sichuan Petroleum Administration, Chengdu, China)
Wenlei Li (PetroChina Sichuan Petroleum Administration, Chengdu, China)
Dongliang Yu (PetroChina Sichuan Petroleum Administration, Chengdu, China)
Gan Cui (China University of Petroleum (East China), Qingdao, China)
JianGuo Liu (College of Pipeline and Civil Engineering, China University of Petroleum, Changping-qu, China)
Zili Li (Department of Oil and Gas Storage and Transportation Engineering, China University of Petroleum Huadong – Qingdao Campus, Qingdao, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 29 March 2021

Issue publication date: 25 May 2021

94

Abstract

Purpose

Alternating current (AC) corrosion is a type of corrosion that occurs in buried pipelines under AC stray current interference, which can increase the hydrogen embrittlement sensitivity of pipelines. However, rare research works have been conducted on the hydrogen permeability characteristics of pipeline steel under AC stray current interference. The purpose of this paper is to study hydrogen permeation behavior of X80 steel under AC stray current interference.

Design/methodology/approach

In this paper, the hydrogen permeation behavior of X80 steel under AC interference is studied by AC hydrogen charging experiment in a dual electrolytic cell. The relationship between hydrogen evolution rate and hydrogen permeation flux is studied using the gas collection method. The difference between AC hydrogen permeability and direct current (DC) hydrogen permeability is also discussed.

Findings

The anodic dissolution caused by AC corrosion promotes the chemical desorption reaction of the adsorbed hydrogen atoms on the surface, reducing the hydrogen atom absorption ratio by 70%. When the AC is smaller than 150░ A/m2, the hydrogen permeation process is controlled by the hydrogen atom generation rate, and the hydrogen permeation flux increases with the increase in hydrogen atom generation rate. When the AC exceeds 400░ A/m2, the hydrogen permeation process is controlled by the absorption ratio. The hydrogen permeation flux decreases with the decrease in the absorption ratio. Under AC interference, there is a maximum hydrogen permeation flux that linearly correlates to the H+ concentration in the solutions.

Originality/value

The high-strength steel is very sensitive to hydrogen embrittlement, and X80 steel has been widely used in oil and gas pipelines. To date, no research has been conducted on the hydrogen permeation behavior of pipeline steel under AC interference, and the hydrogen permeability characteristics of pipeline steel under AC interference are not clear. The research results of this paper are of great significance for ensuring the intrinsic safety of high-strength pipelines under AC stray current interference.

Keywords

Acknowledgements

This work is supported by the PetroChina Innovation Foundation (Grant No. 2019D-5007-0505)

Citation

Wang, A., Deng, Y., Li, K., Li, W., Yu, D., Cui, G., Liu, J. and Li, Z. (2021), "Study on hydrogen permeation behavior of X80 steel under AC stray current interference", Anti-Corrosion Methods and Materials, Vol. 68 No. 2, pp. 64-76. https://doi.org/10.1108/ACMM-03-2020-2286

Publisher

:

Emerald Publishing Limited

Copyright © 2021, Emerald Publishing Limited

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