| PAN Cheng-cheng,SONG Shi-zhe,HU Wen-bin,XIA Da-hai.Preparation and Corrosion Resistance of Covalent Self-assembled Monolayers on Passive Metal Surface[J],48(12):43-53 |
| Preparation and Corrosion Resistance of Covalent Self-assembled Monolayers on Passive Metal Surface |
| Received:September 25, 2019 Revised:December 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.12.005 |
| KeyWord:self-assembled monolayers passive metal covalent combination corrosion resistance |
| Author | Institution |
| PAN Cheng-cheng |
Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin , China |
| SONG Shi-zhe |
Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin , China |
| HU Wen-bin |
Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin , China |
| XIA Da-hai |
Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin , China |
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| Abstract: |
| Chloride ions in the marine atmosphere are one of the most critical factors that affect the stability of the passive film formed on passive metals like stainless steel, Al alloy, etc. Self-assembled monolayers with covalent bond is one of the most effective ways for enhancing the stability of passive film and is the hot research in recent years due to environmentally friendly feature, low cost, high thermodynamic stability and simple process. The self-assembled monolayers only have thickness of several nm, but show good attachment and can achieve layer-by layer assembling, thus providing a new strategy for corrosion protection of stainless steel. The covalent self-assembled monolayers, including single molecule system and multi molecule systems were reviewed, and the assembling mechanism of each film, the factors influencing the film assembling and the potential applications in corrosion protection were discussed. The film of single molecule system mainly included silanes, phosphonic acid compounds, hydroxyl compounds, catechol derivatives, aryldiazo compounds, etc. Due to the poor compactness, uniformity, and coverage rate, the film of single molecule system gradually developed to the monolayers of multi molecule systems, so as to further optimize the comprehensive performance of assembling film. Future work needs to further develop in-situ real-time characterization technology suitable for evaluating the mechanism and assembly process of assembled films. Combining quantum chemical calculation and advanced material characterization methods, important information such as bonding forms, molecular orientation and others can be obtained from micro-nano scale and atomic scale. Future work can focus on the real in-situ characterization technique combined with quantum chemistry calculation that can be used to investigate the assembling process and the assembling mechanism, to clarify the bond type and molecular orientation at atomic, micro and nano scales. There is a great need to develop new types of organic molecules or polymers that can effectively block H2O molecules and Cl- transport to provide scientific basis for active corrosion protection of metallic materials. |
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