Studies on the Cooperative Influence of Cr and Mo on the Pitting Corrosion Resistance of Super Austenitic Stainless Steels
The effects of varying Cr and Mo concentrations on the pitting corrosion resistance of super austenitic stainless steels in Cl<sup>−</sup> solutions were investigated using a combination of immersion experiments, electrochemical measurements, X-ray photoelectron spectroscopy, and first-p...
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MDPI AG
2023-11-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/23/7397 |
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| author | Bingbing Li Yuping Lang Haitao Chen Huapeng Qu Hanqiu Feng Xu Sun Zhiling Tian |
| author_facet | Bingbing Li Yuping Lang Haitao Chen Huapeng Qu Hanqiu Feng Xu Sun Zhiling Tian |
| author_sort | Bingbing Li |
| collection | DOAJ |
| description | The effects of varying Cr and Mo concentrations on the pitting corrosion resistance of super austenitic stainless steels in Cl<sup>−</sup> solutions were investigated using a combination of immersion experiments, electrochemical measurements, X-ray photoelectron spectroscopy, and first-principles computational simulations. The surface characteristics, impedance, and defect concentration of the passive film were changed, and this eventually resulted in a decrease in the number of pitting pits. Due to a decrease in active sites within the passive film, a delayed beginning of pitting, and the combined effect of MoO<sub>4</sub><sup>2−</sup> inhibitors, it was discovered that an increasing Mo concentration slows the rate of pitting extension, resulting in reduced maximum pitting area and depth. Additionally, Mo increased the adsorption energy of nearby atoms, whereas Cr raised the adsorption energy of itself. Interestingly, compared with individual doping, co-doping of Cr and Mo increased work function and adsorption energy, indicating a synergistic impact in enhancing resistance to Cl<sup>−</sup> corrosion. |
| first_indexed | 2024-03-09T01:47:10Z |
| format | Article |
| id | doaj.art-a2966a824d204208aa5271654876429a |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T01:47:10Z |
| publishDate | 2023-11-01 |
| publisher | MDPI AG |
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| series | Materials |
| spelling | doaj.art-a2966a824d204208aa5271654876429a2023-12-08T15:21:02ZengMDPI AGMaterials1996-19442023-11-011623739710.3390/ma16237397Studies on the Cooperative Influence of Cr and Mo on the Pitting Corrosion Resistance of Super Austenitic Stainless SteelsBingbing Li0Yuping Lang1Haitao Chen2Huapeng Qu3Hanqiu Feng4Xu Sun5Zhiling Tian6Central Iron and Steel Research Institute Company Limited, Beijing 100081, ChinaCentral Iron and Steel Research Institute Company Limited, Beijing 100081, ChinaCentral Iron and Steel Research Institute Company Limited, Beijing 100081, ChinaCentral Iron and Steel Research Institute Company Limited, Beijing 100081, ChinaCentral Iron and Steel Research Institute Company Limited, Beijing 100081, ChinaMaterial Digital R&D Center, China Iron & Steel Research Institute Group, Beijing 100081, ChinaCentral Iron and Steel Research Institute Company Limited, Beijing 100081, ChinaThe effects of varying Cr and Mo concentrations on the pitting corrosion resistance of super austenitic stainless steels in Cl<sup>−</sup> solutions were investigated using a combination of immersion experiments, electrochemical measurements, X-ray photoelectron spectroscopy, and first-principles computational simulations. The surface characteristics, impedance, and defect concentration of the passive film were changed, and this eventually resulted in a decrease in the number of pitting pits. Due to a decrease in active sites within the passive film, a delayed beginning of pitting, and the combined effect of MoO<sub>4</sub><sup>2−</sup> inhibitors, it was discovered that an increasing Mo concentration slows the rate of pitting extension, resulting in reduced maximum pitting area and depth. Additionally, Mo increased the adsorption energy of nearby atoms, whereas Cr raised the adsorption energy of itself. Interestingly, compared with individual doping, co-doping of Cr and Mo increased work function and adsorption energy, indicating a synergistic impact in enhancing resistance to Cl<sup>−</sup> corrosion.https://www.mdpi.com/1996-1944/16/23/7397CrMopassive filmfirst-principlespitting corrosion resistancesuper austenitic stainless steel |
| spellingShingle | Bingbing Li Yuping Lang Haitao Chen Huapeng Qu Hanqiu Feng Xu Sun Zhiling Tian Studies on the Cooperative Influence of Cr and Mo on the Pitting Corrosion Resistance of Super Austenitic Stainless Steels Materials Cr Mo passive film first-principles pitting corrosion resistance super austenitic stainless steel |
| title | Studies on the Cooperative Influence of Cr and Mo on the Pitting Corrosion Resistance of Super Austenitic Stainless Steels |
| title_full | Studies on the Cooperative Influence of Cr and Mo on the Pitting Corrosion Resistance of Super Austenitic Stainless Steels |
| title_fullStr | Studies on the Cooperative Influence of Cr and Mo on the Pitting Corrosion Resistance of Super Austenitic Stainless Steels |
| title_full_unstemmed | Studies on the Cooperative Influence of Cr and Mo on the Pitting Corrosion Resistance of Super Austenitic Stainless Steels |
| title_short | Studies on the Cooperative Influence of Cr and Mo on the Pitting Corrosion Resistance of Super Austenitic Stainless Steels |
| title_sort | studies on the cooperative influence of cr and mo on the pitting corrosion resistance of super austenitic stainless steels |
| topic | Cr Mo passive film first-principles pitting corrosion resistance super austenitic stainless steel |
| url | https://www.mdpi.com/1996-1944/16/23/7397 |
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