Saved in:
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2022
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2201.12964 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866913388718718976 |
|---|---|
| author | Lao, Weiwei Luo, Qiaojie Huang, Ying Zhong, Haixu Lou, Chaoqian Deng, Xuliang Wen, Xiufang Li, Xiaodong |
| author_facet | Lao, Weiwei Luo, Qiaojie Huang, Ying Zhong, Haixu Lou, Chaoqian Deng, Xuliang Wen, Xiufang Li, Xiaodong |
| contents | Current contradictory understanding of passivation comes from overly-complex passive models, defective characterization and misplaced theoretical approaches. From brand-new experimentation, we find that a Ti passive membrane has spatiotemporally-ordered macrostructure. At the start, a thermodynamically-stable chemisorbed Ti-O monolayer is immediately formed to inactivate the outmost Ti atoms and shield direct reaction of environmental oxygens on metallic matrix, and then an underneath TiOx@Ti ceramet-like non-equilibrium gradient oxide layer rapidly forms. The two layers work synergistically to keep the macro-ordered passive membrane growing slowly via non-linear mechanism of incremental oxidation damping, thus effecting passivation. These findings disprove "the adsorption theory of passivation" and "the theory of passivity film" and inform a new theory we call "passivation theory of incremental oxidation damping". |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2201_12964 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | The Growth of Passive Membranes: Evidence from Ti and Like Metals Lao, Weiwei Luo, Qiaojie Huang, Ying Zhong, Haixu Lou, Chaoqian Deng, Xuliang Wen, Xiufang Li, Xiaodong Materials Science Adaptation and Self-Organizing Systems Current contradictory understanding of passivation comes from overly-complex passive models, defective characterization and misplaced theoretical approaches. From brand-new experimentation, we find that a Ti passive membrane has spatiotemporally-ordered macrostructure. At the start, a thermodynamically-stable chemisorbed Ti-O monolayer is immediately formed to inactivate the outmost Ti atoms and shield direct reaction of environmental oxygens on metallic matrix, and then an underneath TiOx@Ti ceramet-like non-equilibrium gradient oxide layer rapidly forms. The two layers work synergistically to keep the macro-ordered passive membrane growing slowly via non-linear mechanism of incremental oxidation damping, thus effecting passivation. These findings disprove "the adsorption theory of passivation" and "the theory of passivity film" and inform a new theory we call "passivation theory of incremental oxidation damping". |
| title | The Growth of Passive Membranes: Evidence from Ti and Like Metals |
| topic | Materials Science Adaptation and Self-Organizing Systems |
| url | https://arxiv.org/abs/2201.12964 |