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Revisiting the effect of molybdenum on pitting resistance of stainless steels

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A Correction to this article was published on 21 August 2021

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Abstract

As an important alloyed element to improve the localized corrosion resistance of stainless steels, Mo has been widely studied by researchers. This article reviews the mechanisms of the effect of Mo on localized corrosion. Two possible effects and corresponding experimental research are described respectively: Mo exists in the passive film as oxide and enhances the film stability (manifesting as lower nucleation probability of localized corrosion and longer delay time of breakdown of the passive film); Mo affects dissolution kinetics and inhibits active dissolution current density (manifesting as smaller metastable pitting current density and size). Then some contradictory results are discussed by considering the pitting model proposedrecently. Strictly speaking, none of the existing experimental results can deny the effect of Mo on the passive film or on the dissolution kinetics. It is reasonable to believe that Mo affects the entire process of localized corrosion rather than a single reaction. Finally, some possible research suggestions are put forward.

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Fig. 1

Reproduced with permission from Ref. [26], Copyright 1983, Elsevier

Fig. 2

Reproduced with permission from Ref. [17] Copyright 2020. The Author(s)

Fig. 3

Reproduced with permission from Ref. [20] Copyright 2017, Elsevier

Fig. 4

Reproduced with permission from Ref. [32]. Copyright 2002, Elsevier

Fig. 5

Reproduced with permission from Ref. [36] Copyright 2001 Elsevier

Fig. 6
Fig. 7

Copyright 2018 The Author(s)

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Acknowledgements

This work was financially supported by National Natural Science Foundation of China (Grant Nos. 51901046, and 51871061).

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Authors and Affiliations

  1. Department of Materials Science, Fudan University, Shanghai, 200433, China

    Yang-Ting Sun, Xin Tan, Long-Lin Lei, Jin Li & Yi-Ming Jiang

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  1. Yang-Ting Sun
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Yang-Ting Sun and Xin Tan wrote the draft; Long-Lin Lei and Yang-Ting Sun collected the references; Jin Li contributed to conceived the idea of the study. All authors contributed to the writing and revisions.

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Correspondence to Jin Li.

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Sun, YT., Tan, X., Lei, LL. et al. Revisiting the effect of molybdenum on pitting resistance of stainless steels. Tungsten 3, 329–337 (2021). https://doi.org/10.1007/s42864-021-00099-1

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