Qiang, Yujie, et al. Journal of Cleaner Production 152 (2017): 17-25.
Challenge: In 26% NH4Cl (a common battery electrolyte) solutions, zinc corrosion requires effective inhibition. Traditional inhibitors are toxic and inefficient, demanding sustainable alternatives.
Solution: Sodium dodecylbenzene sulfonate (SDBS) was validated as a high-performance, eco-friendly anodic inhibitor for zinc protection. Its adsorption mechanism and temperature resilience were proven through electrochemical, microscopic, and computational methods.
Key Results:
· Superior Inhibition: Achieved 89.7% efficiency (0.8 mM, 298 K), outperforming HgCl2 (48.8%). Formed a protective film via mixed physisorption/chemisorption, obeying Langmuir model. FE-SEM/AFM showed dramatically reduced corrosion damage on SDBS-treated zinc.
· Battery-Compatible Behavior: Inhibition diminishes at positive potentials, preventing overprotection in battery systems.
· Temperature Resilience: Retained significant efficacy (298→328 K), enabling use in varied thermal conditions.
· Mechanistic Insights: Quantum calculations/MD simulations confirmed sulfonate groups adsorb vertically on zinc, enabling dense hydrophobic barrier formation. The dodecyl benzene moiety creates a water-repellent layer, blocking electrolyte access.
· Electrochemical validation: Based on potentiodynamic polarization and EIS results, the effective anodic inhibition and the film's stability are confirmed. The corrosion inhibition ability of SDBS is enhanced with the increase of SDBS concentration and decreased with the increase of temperature.
Peng, Xianjia, et al. Journal of Environmental Sciences 42 (2016): 89-96.