研究目的
Investigating the adsorption behavior and corrosion inhibition performance of organic inhibitors (BTThio and ClGaBTThioPc) on aluminum in hydrochloric acid solution.
研究成果
BTThio and ClGaBTThioPc effectively inhibit aluminum corrosion in HCl, with ClGaBTThioPc showing superior performance due to extended π-conjugation. Adsorption follows Freundlich, Temkin, and El-Awady isotherms, indicating heterogeneous surface interactions. Experimental and theoretical results corroborate, suggesting potential for these inhibitors in corrosion protection applications.
研究不足
The inhibitors are not water-soluble, requiring dissolution in tetrahydrofuran before dilution, which may affect solubility and performance. The study is limited to hydrochloric acid medium and aluminum; applicability to other metals or acids is not explored. Adsorption mechanisms are complex and not fully elucidated by a single isotherm.
1：Experimental Design and Method Selection:
The study employs electrochemical techniques (open circuit potential, potentiodynamic polarization, electrochemical impedance spectroscopy) and computational methods (density functional theory) to evaluate corrosion inhibition. Adsorption isotherms (Langmuir, Freundlich, Temkin, El-Awady, Frumkin) are used to analyze adsorption behavior. Surface analysis includes SEM, EDX, FTIR, and XRD.
2：Sample Selection and Data Sources:
Aluminum coupons (>99% purity) cut into 2x2x0.1 cm sizes, with an exposed area of 3.0 cm2. Inhibitors BTThio and ClGaBTThioPc are synthesized as reported. Hydrochloric acid (1.0 M) is used as the corrosive medium.
3：1 cm sizes, with an exposed area of 0 cm2. Inhibitors BTThio and ClGaBTThioPc are synthesized as reported. Hydrochloric acid (0 M) is used as the corrosive medium. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Aluminum coupons, hydrochloric acid (Merck), ultra-pure water (Milli-Q Water System), solvents (Sigma Aldrich, Fluka, Merck), inhibitors BTThio and ClGaBTThioPc. Equipment includes SEM (JOEL JSM 840), EDX (INCA PENTA FET), FTIR (Bruker Alpha IR), XRD (Bruker D8 Discover), electrochemical setup (BAS 100B, Autolab PGSTAT 30).
4：0). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Electrodes are prepared by abrasion and cleaning. Inhibitor solutions are prepared in tetrahydrofuran and diluted with HCl. Electrochemical measurements are conducted in a three-electrode cell at 28°C after 30 min stabilization. Data is collected and analyzed using specified software.
5：Data Analysis Methods:
Data is fitted using non-linear least squares methods. Quantum chemical calculations are performed using Gaussian 09 with B3LYP/6-31++G(d,p) level.
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Scanning Electron Microscope
JSM 840
JEOL
Obtaining SEM images for surface analysis
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Energy Dispersive X-ray Spectroscopy
INCA PENTA FET
Oxford Instruments
Qualitative determination of elemental compositions
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FTIR Spectrophotometer
Alpha IR (100 FT-IR)
Bruker
Obtaining FTIR spectra with ATR sampling
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X-ray Diffractometer
D8 Discover
Bruker
Recording XRD patterns
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Potentiostat
PGSTAT 30
Autolab
Performing EIS studies
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Hot Plate
6796-220
Corning
Regulating temperature at 28°C
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Electrochemistry Setup
BAS 100B
BAS
Conducting electrochemical experiments
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Milli-Q Water System
Millipore Corp.
Producing ultra-pure water
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