Effect of Copper Content on the MIC Resistance in Pipeline Steel
Received date: 2022-01-06
Revised date: 2022-03-11
Online published: 2022-05-30
Supported by
National Natural Science Foundation of China(U1906226)
Microbiologically induced corrosion (MIC), particularly those caused by sulfate-reducing bacteria (SRB), is considered as a destructive mechanism in buried pipeline steels, which has received considerable attention since its discovery a century ago. Research has shown that sessile cells that are attached to a metal surface embedded in biofilms with extracellular polymeric substances (EPS) are responsible for the occurrence of MIC. However, the commonly used MIC control strategy, i.e., biocides, cannot perform sterilization of sessile cells because of the protection of the biofilm. Cu-bearing pipeline steel is a newly developed steel that can be used for MIC control in buried pipes. The continuous release of cytotoxic Cu ions from the steel matrix leads to MIC resistance. However, the influence of Cu content on MIC resistance remains unclear. A lower Cu content in steel is not beneficial to its MIC resistance, whereas a higher Cu content can increase the cost and may cause “hot shortness” during thermal processing. Therefore, clarifying the influence of Cu content on the properties of Cu-bearing pipeline steel is important for the practical application of the steel. In the present study, the influence of Cu content (0, 0.7%, and 1.34%; mass fraction) on the corrosion behavior of X65 grade Cu-bearing pipeline steel was investigated through electrochemical measurements and surface analysis during 14 d immersion in sterile and SRB-inoculated NS4 solutions, respectively. Experimental results demonstrated that the antibacterial properties and corrosion resistance of the steel improved with the increase of Cu content. When Cu content was increased to 1.34%, the pitting corrosion of the steel in the SRB-inoculated medium was almost suppressed. The protective corrosion products formed in the sterile medium and antibacterial Cu ions continuously released from the steel in the SRB-inoculated medium resulted in the remarkable corrosion resistance of Cu-bearing pipeline steels.
ZENG Yunpeng , YAN Wei , SHI Xianbo , YAN Maocheng , SHAN Yiyin , YANG Ke . Effect of Copper Content on the MIC Resistance in Pipeline Steel[J]. Acta Metall Sin, 2024 , 60(1) : 43 -56 . DOI: 10.11900/0412.1961.2022.00007
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