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Meng XZ, Li XR, Li F, Yan HJ, Zhang QH, Wu LK, Di Tommaso D, Cao FH. Molecular Insights into the Stability of Titanium in Electrolytes Containing Chlorine and Fluorine Ions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023. [PMID: 38031448 DOI: 10.1021/acs.langmuir.3c02484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2023]
Abstract
Titanium and its alloys are protected by a compact and stable passive film, which confers resistance to corrosion by the primary halogen chloride (Cl-) while being less effective against fluoride (F-). Although researchers have recognized different macroscopic corrosion effects of these halide ions on titanium, the underlying mechanisms remain largely unexplored. In this work, the bonding of Cl-/F- with stable passive films was studied in neutral and acidic (pH = 2.3) conditions. The synergistic effect between the interfacial hydrogen bond (HB) structure and halogens on titanium corrosion was first revealed using first-principles calculation and Raman spectroscopy. F- forms more stable halogen-Ti bonds than Cl-, resulting in titanium degradation. The proton combined with F- exhibits a specific synergistic effect, causing corrosion of the passive film. The water hydrogen bond transformation index (HBTI) at the titanium/aqueous interface was 1.88 in an acidic solution containing F-, significantly higher than that in neutral/acid solutions containing Cl- (1.80/1.81) and a neutral solution containing F- (1.81). This work clarifies the structure-activity relationship between HBTI and the destruction of titanium passive films. We propose that the microstructure of the interfacial HB is an undeniable factor in the corrosion of titanium.
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Affiliation(s)
- Xian-Ze Meng
- School of Materials, Sun Yat-sen University, Shenzhen 518107, China
| | - Xin-Ran Li
- School of Materials, Sun Yat-sen University, Shenzhen 518107, China
| | - Fei Li
- Engineering Research Center of Seawater Utilization of Ministry of Education, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China
- Department of Chemistry, School of Physical and Chemical Sciences, Queen Mary University of London, , Mile End Road, London E1 4NS, U.K
| | - Hao-Jie Yan
- School of Materials, Sun Yat-sen University, Shenzhen 518107, China
| | - Qin-Hao Zhang
- School of Materials, Sun Yat-sen University, Shenzhen 518107, China
| | - Lian-Kui Wu
- School of Materials, Sun Yat-sen University, Shenzhen 518107, China
| | - Devis Di Tommaso
- Department of Chemistry, School of Physical and Chemical Sciences, Queen Mary University of London, , Mile End Road, London E1 4NS, U.K
- Digital Environment Research Institute (DERI), Empire House, 67-75 New Road, London E1 1HH, U.K
| | - Fa-He Cao
- School of Materials, Sun Yat-sen University, Shenzhen 518107, China
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Shkoor M, Jalab R, Khaled M, Shawkat TS, Korashy HM, Saad M, Su HL, Bani-Yaseen AD. Experimental and theoretical investigations of the effect of bis-phenylurea-based aliphatic amine derivative as an efficient green corrosion inhibitor for carbon steel in HCl solution. Heliyon 2023; 9:e20254. [PMID: 37780763 PMCID: PMC10539979 DOI: 10.1016/j.heliyon.2023.e20254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 08/26/2023] [Accepted: 09/16/2023] [Indexed: 10/03/2023] Open
Abstract
A novel bis-phenylurea-based aliphatic amine (BPUA) was prepared via a facile synthetic route, and evaluated as a potential green organic corrosion inhibitor for carbon steel in 1.0 M HCl solutions. NMR spectroscopy experiments confirmed the preparation of the targeted structure. The corrosion inhibitory behavior of the prospective green compound was explored experimentally by electrochemical methods and theoretically by DFT-based quantum chemical calculations. Obtained results revealed an outstanding performance of BPUA, with efficiency of 95.1% at the inhibitor concentration of 50 mg L-1 at 25 °C. The novel compound has improved the steel resistivity and noticeably reduced the corrosion rate from 33 to 1.7 mils per year. Furthermore, the adsorption study elucidates that the mechanism of the corrosion inhibition activity obeys Langmuir isotherm with mixed physisorption/chemisorption modes for BPUA derivatives on the steel surface. Calculated Gibb's free energy of the adsorption process ranges from -35 to -37 kJ mol-1. The SEM morphology analysis validates the electrochemical measurements and substantiates the corrosion-inhibiting properties of BPUA. Additionally, the eco-toxicity assessment on human epithelial MCF-10A cells proved the environmental friendliness of the BPUA derivatives. Density functional theory (DFT) calculations correlated the inhibitor's chemical structure with the corresponding inhibitory behavior. Quantum descriptors disclosed the potentiality of BPUA adsorption onto the surface through the heteroatom-based functional groups and aromatic rings.
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Affiliation(s)
- Mohanad Shkoor
- Department of Chemistry & Earth Sciences, College of Arts & Science, Qatar University, P.O. Box 2713, Doha, Qatar
| | - Rem Jalab
- Gas Processing Center, College of Engineering, Qatar University, P.O. Box 2713, Doha, Qatar
| | - Mazen Khaled
- Department of Chemistry & Earth Sciences, College of Arts & Science, Qatar University, P.O. Box 2713, Doha, Qatar
| | - Tahseen S. Shawkat
- Department of Pharmaceutical Sciences, College of Pharmacy, Qatar University, P.O. Box 2713, Doha, Qatar
| | - Hesham M. Korashy
- Department of Pharmaceutical Sciences, College of Pharmacy, Qatar University, P.O. Box 2713, Doha, Qatar
| | - Mohamed Saad
- Gas Processing Center, College of Engineering, Qatar University, P.O. Box 2713, Doha, Qatar
- Department of Chemical Engineering, College of Engineering, Qatar University, P.O. Box 2713, Doha, Qatar
| | - Haw-Lih Su
- Department of Applied Chemistry, National Chiayi University, 300 Syuefu Rd, Chiayi City, Taiwan
| | - Abdulilah Dawoud Bani-Yaseen
- Department of Chemistry & Earth Sciences, College of Arts & Science, Qatar University, P.O. Box 2713, Doha, Qatar
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Under deposit corrosion failure: mitigation strategies and future roadmap. CHEMICAL PAPERS 2022. [DOI: 10.1007/s11696-022-02601-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
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