Find in Library

The effect of pH value on the corrosion behavior and microstructural evolution of carbon fiber reinforced magnesium matrix (Cf/Mg) composites in NaCl solution were investigated. The results of the electrochemical test revealed that the corrosion current density of Cf/Mg composites in pH = 13 solution achieved 3.4 × 10−5 Am/cm2, which was one order and two orders of magnitude lower than that of pH = 7 solution (2.6 × 10−4 Am/cm2) and pH = 1 solution (1.1 × 10−3 Am/cm2), respectively. Electrochemical impedance spectroscopy (EIS) curves implied that the corrosion resistance of Cf/Mg composites was enhanced when the pH value increased. The microstructure of the Cf/Mg composites after corrosion in the solution with pH = 13 first appeared as some point-like bumps, and then gradually grew into a lamellar structure. The corrosion mechanisms and microstructural evolution of the Cf/Mg composites were systematically discussed.