High efficiency corrosion inhibitor 8-hydroxyquinoline and its synergistic effect with sodium dodecylbenzenesulphonate on AZ91D magnesium alloy

The inhibition effects of sodium dodecylbenzenesulphonate (SDBS) and 8-hydroxyquinoline (8HQ) on the corrosion of AZ91D magnesium alloy in ASTM D1384-87 corrosive solution were investigated by the electrochemical impedance spectroscopy and potentiodynamic polarization tests. For SDBS, the inhibition effect was not significant. For 8HQ, a monotonic increase in inhibition efficiency was observed as a function of the immersion time, and the component of the film was Mg(8HQ)2, which was characterized by three spectra methods. Upon mixing 8HQ and SDBS inhibitors, a synergistic inhibition behavior was observed, and a proper synergistic inhibition mechanism was proposed.