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Zhang, Yuanmi, et al. Journal of Alloys and Compounds 849 (2020): 156230.
Benzyltriphenylphosphonium chloride (BPP), a cationic phosphonium salt, demonstrates remarkable potential as a corrosion inhibitor for magnesium alloys exposed to dilute chloride media. This case study highlights its application-alone and in synergy with L-histidine-for developing highly effective inhibitor systems in 0.05 wt% NaCl environments.
Electrochemical impedance spectroscopy confirms that BPP significantly enhances surface protection, with inhibition efficiencies exceeding 90% when optimally combined with L-histidine (0.50 mM each). Potentiodynamic polarization analysis reveals that BPP behaves as a mixed-type inhibitor, simultaneously suppressing anodic Mg dissolution and retarding cathodic reactions. Long-term immersion studies further indicate the persistence of its protective effect.
Surface characterization via SEM and AFM shows that BPP promotes the formation of a compact, adherent inhibitor film, while XRD results confirm its stabilizing influence on surface phases. The film arises from both physical adsorption and chemical reactions between BPP and the magnesium substrate. XPS and density functional theory analyses support the formation of insoluble reaction products that occlude pores and defects, thereby restricting electrolyte penetration.
The synergistic BPP-L-histidine system enhances film continuity and structural stability, yielding a dense barrier that effectively mitigates chloride-induced degradation. These findings highlight Benzyltriphenylphosphonium chloride as a valuable component for designing advanced, durable corrosion inhibition coatings for magnesium alloys used in automotive, aerospace, and electronic applications.
