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Streptococcus mutans soluble extracellular polymeric substances and sodium molybdate as mixed corrosion inhibitor for X70 steel

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Abstract

In this work, the corrosion behavior and mechanism of X70 steel induced by soluble extracellular polymeric substances (s-EPS) extracted from Streptococcus mutans (S. mutans) and sodium molybdate as the mixed corrosion inhibitor in 3.5 wt% NaCl solution were investigated. Results of electrochemical measurements showed that the inhibition efficiency of single s-EPS or sodium molybdate increased with increase in concentration of inhibitor but the inhibition efficiency was not too high, while a synergistic effect existed when s-EPS and sodium molybdate were combined together to prevent X70 steel corrosion. The synergistic effect increased with increasing the concentration of s-EPS from 10 to 40 mg/L in the presence of 50 mg/L sodium molybdate, and the synergistic parameter can achieve 5.46. The mixed inhibitors simultaneously inhibited the anodic and cathodic corrosion of X70 steel clearly, which greatly promoted the activation energy of the corrosion reaction. Results from X-ray photoelectron spectroscopy, atomic force microscopy, and field emission scanning electron microscopy demonstrated that co-adsorption of s-EPS and [(OH)4OMo–O–MoO(OH)4]2− led to the formation of a more homogeneous and protective film on the surface of X70 steel. All the adsorption of single and mixed inhibitors followed the Langmuir adsorption model according to the thermodynamic analysis.

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The authors declare that all the data supporting the findings of this study are available within the article and its supplementary information files.

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Acknowledgements

Authors thank Analysis and Measurement Center of Yunnan University for the sample testing service.

Funding

This work was supported by the National Natural Science Foundation of China (grant numbers 52061041, 51661033, 31660538, 51361028, and 51161025), the 13th Graduate Student Scientific 336 Research Innovation Programme of Yunnan University (Grant Number 2021Y384).

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Authors and Affiliations

  1. School of Chemical Science and Technology, Yunnan University, Kunming, 650091, China

    Shuai Chen, Tao Wu, Feng Zeng, Kexin Chen & Qing Qu

  2. School of Materials and Energy, Yunnan University, Kunming, 650091, China

    Shuai Chen

  3. State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, Kunming, 650091, China

    Lei Li

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  1. Shuai Chen
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  2. Tao Wu
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  3. Feng Zeng
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Contributions

SC contributed to writing—original draft, experiment, investigation, data curation. TW contributed to data management, investigation. FZ contributed to investigation, data curation. KC contributed to investigation, data curation. LL contributed to supervision, resources. QQ contributed to conceptualization, supervision, writing—review and editing.

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Correspondence to Lei Li or Qing Qu.

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Chen, S., Wu, T., Zeng, F. et al. Streptococcus mutans soluble extracellular polymeric substances and sodium molybdate as mixed corrosion inhibitor for X70 steel. J Mater Sci 58, 2915–2934 (2023). https://doi.org/10.1007/s10853-023-08228-6

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