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Gao X, Gao Y, Cao H, Zhang J. Eco-Friendly Sustainable and Responsive High-Performance Benzotriazole-Metal Organic Frameworks/Silica Composite Coating with Active/Passive Corrosion Protection on Copper. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:7639-7652. [PMID: 38552104 DOI: 10.1021/acs.langmuir.4c00328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/10/2024]
Abstract
Coatings with only passive protection cannot offer long-term anticorrosion on metals. Eco-friendly sustainable and responsive coating for active/passive corrosion protection is desirable to extend the service life of metals. Here, benzotriazole (BTA)-metal organic frameworks (Cu-MOFs, UiO-66) were embedded in silica (SiO2) coating by one-step electrodeposition on copper. Combined with passive capability of MOFs and active protection of BTA inhibitor, the composite coating (BTA-MOF/SiO2) exhibited high and stable corrosion resistance, confirmed by microstructure characterizations and electrochemical tests. As a result, the as-prepared composite coating exhibited superhydrophobicity with a water contact angle of 154.2°. With loading of BTA-MOF in SiO2 coating, the impedance modulus at 0.01 Hz increased by ∼10-fold and the corrosion current density decreased to 3.472 × 10-9 A·cm-2. Immersion and salt spray tests confirmed the long-term protection of the composite coating. The responsive release of BTA inhibitor endows the coating with a responsively anticorrosive behavior. The active-passive ability makes the coating a good candidate for protection on metals used in highly salty environments.
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Affiliation(s)
- Xu Gao
- Shanghai Key Laboratory of Material Protection and Advanced Material in Electric Power, Shanghai University of Electric Power, Shanghai 200090, China
| | - Yan Gao
- Shanghai Key Laboratory of Material Protection and Advanced Material in Electric Power, Shanghai University of Electric Power, Shanghai 200090, China
| | - Huaijie Cao
- Shanghai Key Laboratory of Material Protection and Advanced Material in Electric Power, Shanghai University of Electric Power, Shanghai 200090, China
| | - Junxi Zhang
- Shanghai Key Laboratory of Material Protection and Advanced Material in Electric Power, Shanghai University of Electric Power, Shanghai 200090, China
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Holder D, Peter A, Kirsch M, Cáceres S, Weber R, Onuseit V, Kulenovic R, Starflinger J, Graf T. Enhancing heat transfer at low temperatures by laser functionalization of the inner surface of metal pipes. Sci Rep 2024; 14:2557. [PMID: 38297142 PMCID: PMC10830557 DOI: 10.1038/s41598-024-53062-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Accepted: 01/27/2024] [Indexed: 02/02/2024] Open
Abstract
The latent heat transfer during vapour condensation in the condenser section of passive heat transport devices such as the two-phase closed thermosiphon is limited by film condensation. Dropwise condensation provides an increase of the heat transfer coefficient by up to one order of magnitude and can be achieved with a water-repellant surface. The inner surface of pipes made from stainless steel was functionalized by laser surface texturing with ultrashort laser pulses and subsequent storage in a liquid containing long-chained hydrocarbons. The pipes were separated into half-pipes by wire eroding to enable laser texturing of the inner surface, and were then joined by electron beam welding after laser texturing. As a result, superhydrophobic and water-repellent surfaces with a contact angle of 153° were obtained on the inner surface of the pipes with a length of up to 1 m. The functionalized pipes were used in the condenser section of a two-phase closed thermosiphon to demonstrate a heat transfer rate of 0.92 kW at 45 °C, which is approximately three times the heat transfer rate of 0.31 kW of a smooth reference pipe.
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Affiliation(s)
- Daniel Holder
- Institut für Strahlwerkzeuge (IFSW), University of Stuttgart, Pfaffenwaldring 43, Stuttgart, Germany.
- ARENA2036 Research Campus, Pfaffenwaldring 19, Stuttgart, Germany.
| | - Alexander Peter
- Institut für Strahlwerkzeuge (IFSW), University of Stuttgart, Pfaffenwaldring 43, Stuttgart, Germany
| | - Marc Kirsch
- Institut für Kernenergetik und Energiesysteme (IKE), University of Stuttgart, Pfaffenwaldring 31, Stuttgart, Germany
| | - Sergio Cáceres
- Institut für Kernenergetik und Energiesysteme (IKE), University of Stuttgart, Pfaffenwaldring 31, Stuttgart, Germany
| | - Rudolf Weber
- Institut für Strahlwerkzeuge (IFSW), University of Stuttgart, Pfaffenwaldring 43, Stuttgart, Germany
| | - Volkher Onuseit
- Institut für Strahlwerkzeuge (IFSW), University of Stuttgart, Pfaffenwaldring 43, Stuttgart, Germany
| | - Rudi Kulenovic
- Institut für Kernenergetik und Energiesysteme (IKE), University of Stuttgart, Pfaffenwaldring 31, Stuttgart, Germany
| | - Jörg Starflinger
- Institut für Kernenergetik und Energiesysteme (IKE), University of Stuttgart, Pfaffenwaldring 31, Stuttgart, Germany
| | - Thomas Graf
- Institut für Strahlwerkzeuge (IFSW), University of Stuttgart, Pfaffenwaldring 43, Stuttgart, Germany
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Ma T, Wang D, Tong W, Zhang S, Wang J. Chemical Etching, Thermally Driven Combination Strategy to Fabricate Superhydrophobic Fe-Based Amorphous Coatings with Excellent Anticorrosion Property: Based on Hydroxylation Effect. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:11864-11878. [PMID: 37556763 DOI: 10.1021/acs.langmuir.3c01665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/11/2023]
Abstract
Fe-based amorphous coatings are ideal materials for surface protection due to their outstanding mechanical properties and corrosion resistance. However, coating defects are inevitably formed during the preparation of coatings by thermal spray technology, which seriously affects the corrosion performance. Inspired by bionics, conceiving superhydrophobic surfaces with liquid barrier properties has become a new idea for the corrosion protection of metal surfaces. In this work, based on surface hydroxylation, we designed a superhydrophobic Fe-based amorphous coating with corrosion resistance by chemical etching combined with a thermally driven preparation strategy. The obtained superhydrophobic coatings exhibit liquid repellency (contact angle >150°) and excellent corrosion resistance (corrosion current density and passive current density reduced by 3 orders of magnitude). The results revealed that the superhydrophobic behavior stems from the construction of hydroxyl-induced surface micro-/nanomultilevel aggregates (cluster structures). The hydrophobic agent layer deposited on the surface of cluster aggregates and the nanoparticle elements that constitute the clusters dominate the corrosion resistance of the coating. This work provides an effective guide to the design of high-corrosion-resistant Fe-based amorphous alloy coatings and promotes their engineering applications.
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Affiliation(s)
- Tengda Ma
- Key Laboratory of Electromagnetic Processing of Materials, Northeastern University, Shenyang 110819, China
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, CAS, Shenyang 110016, China
| | - Debin Wang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, CAS, Shenyang 110016, China
- School of Materials Science and Engineering, University of ScienAce and Technology of China, Shenyang 110016, China
| | - Weiping Tong
- Key Laboratory of Electromagnetic Processing of Materials, Northeastern University, Shenyang 110819, China
| | - Suode Zhang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, CAS, Shenyang 110016, China
| | - Jianqiang Wang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, CAS, Shenyang 110016, China
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