Fractal characteristics of AC corrosion morphology of X80 pipeline steel in coastal soil solution
Anti-Corrosion Methods and Materials
ISSN: 0003-5599
Article publication date: 4 October 2019
Issue publication date: 17 October 2019
Abstract
Purpose
Pipelines are seriously corroded due to the close distance between pipelines and high voltage transmission lines. The purpose of this paper is to study the influence of alternating current (AC) on corrosion behavior of X80 pipeline steel in coastal soil solution.
Design/methodology/approach
The corrosion behavior of X80 steel under different AC densities in coastal soil solution was investigated by electrochemical measurements and image processing technology. Furthermore, a quantitative description model of AC corrosion through fractal dimension of corrosion image was established.
Findings
The results show that under low AC density the X80 steel is mainly uniform corrosion, and once AC density reaches 150 A/m2, the corrosion morphology gradually turns to pitting corrosion with irregular circle. For another aspect, the fractal dimension of corrosion images shows that the two/three-dimensional fractal dimension increase with the increase of AC density, presenting a linear and an exponential relationship respectively. In addition, the variation of the three-dimensional fractal dimension is the same as that of average corrosion rate. The threshold of the increasing trend of fractal dimension as well as corrosion type is 150 A/m2.
Originality/value
The investigation provides a quantitative method to describe AC corrosion morphology through fractal dimension. Furthermore, the method is of benefit to process corrosion images automatically.
Keywords
Acknowledgements
The authors would like to acknowledge financial support from the National Material Environmental Corrosion infrastructure and the National Natural Science Foundation of China (No. 51301201).
Citation
Fu, Y., Kou, J. and Du, C. (2019), "Fractal characteristics of AC corrosion morphology of X80 pipeline steel in coastal soil solution", Anti-Corrosion Methods and Materials, Vol. 66 No. 6, pp. 868-878. https://doi.org/10.1108/ACMM-01-2019-2066
Publisher
:Emerald Publishing Limited
Copyright © 2019, Emerald Publishing Limited