Corrosion inhibition mechanism of Na2CrO4 on 316L in highly concentrated NaOH solutions
The corrosion inhibition behavior of Na 2 CrO 4 on 316L in high-temperature concentrated NaOH solution was investigated. The results indicated that Na 2 CrO 4 effectively inhibited the corrosion of 316L. The addition of Na 2 CrO 4 induced the variation of film composition from Ni-rich to Cr-rich. TEM results showed that in the absence of Na 2 CrO 4 , the inner and outer films exhibited lattice fringe structures. In the presence of Na 2 CrO 4 , the inner and outer layers of the passive films exhibited amorphous structures. CrO 4 2− exhibited a mixed mode of adsorption involving chemisorption and physisorption. Chemisorption promoted the formation of Cr-rich protective passive films. Physisorption was beneficial for the self-healing of localized defects in passive films. Besides, the presence of Na 2 CrO 4 induced the competitive adsorption of CrO 4 2− with OH − , which reduced the corrosion susceptibility of 316L.
Authors
- Hongwei Xie (ORCID: https://orcid.org/0000-0001-6530-5006)
- Zhu Wang (ORCID: https://orcid.org/0000-0001-7304-3683)
- Hao Du (ORCID: https://orcid.org/0000-0001-7372-2467)
- Chunliu Li (ORCID: https://orcid.org/0009-0007-2233-5572)
- Shaona Wang (ORCID: https://orcid.org/0000-0001-7055-586X)
- Lei Zhang (ORCID: https://orcid.org/0000-0003-1592-9966)
- Yi Zhang (ORCID: https://orcid.org/0000-0003-0391-7159)
- Biao Liu (ORCID: https://orcid.org/0000-0001-6920-7016)
Institutions
- Institute of Process Engineering (CN)
- Northeastern University (CN)
- University of Science and Technology Beijing (CN)
Publication Details
- Journal
- Journal of Materials Research and Technology
- Published
- 2025-02-15
- DOI
- https://doi.org/10.1016/j.jmrt.2025.02.136
- Citations
- 4
- Primary Topic
- Corrosion Behavior and Inhibition
- Type
- article
- Field-Weighted Citation Impact
- 2.07