Abstract
The corrosion inhibition of Benzyltriphenylphosphonium chloride (BPP), l-Histidine (L-His), and mixed of them on magnesium alloys in 0.05 wt% NaCl is investigated by electrochemical measurements. The inhibition efficiency exceeds 90% with the suitable concentration as well as the ratio between BPP and L-His. Moreover, the inhibition effect would be kept even after the long term immersion in NaCl. It is attributed to the formation of inhibitor-coating film, which is further supported by the scanning electron microscopy (SEM), atomic force microscopy (AFM), and X-ray diffractometer (XRD). Finally, the possible inhibited mechanism is proposed according to X-ray photoelectron spectroscopy (XPS) analysis and the density functional theory calculation.
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