Effect of Surfactants on the Corrosion Protectability of Calcium Phosphate Conversion Coatings on Duplex Structured Mg-8Li (in Wt.%) Alloy

Calcium phosphate chemical conversion coatings with the additions of sodium lauryl sulfate (SLS) and dodecanesulfonic acid (DSS), respectively, were prepared on surface Mg-8Li alloy. The cross-sectional corrosion morphologies, compositions, behavior coated surfaces in 3.5 wt.% NaCl solution respectively investigated by using a scanning electron microscope (SEM), energy dispersive spectrometer (EDS), electrochemical workstation, hydrogen evolution apparatus, optical (OM). results demonstrated that Ca-P had petal-like structure being composed leaf-like particles. After performed for 30 min solutions containing SLS DSS, corresponding average film thicknesses 27 μm 7 μm. In addition, current densities DSS 1.438 × 10−5 A·cm−2 4.719 A·cm−2, respectively. effect surfactants coating was discussed detail.