Graphite Oxide-Based Coatings on ZK60A Magnesium Alloy: Effect of Chitosan and Silane Coupling Agents on the Corrosion Resistance
摘要
The present work aimed to study the corrosion behavior of ZK60 magnesium alloy coated with graphite oxide, using silane (APTES—3-aminopropyltriethoxysilane) and chitosan as coupling agents. The surface chemistry and morphology were studied by x-ray photoelectron spectroscopy and scanning electron microscopy, respectively. Electrochemical impedance spectroscopy, potentiodynamic polarization, and scanning electrochemical microscopy were employed to evaluate the electrochemical behavior of the graphite oxide-coated alloy. The graphite oxide coatings covered the magnesium substrate, forming interlocked layers. The electrochemical tests showed that the coatings protect the substrate, acting as a corrosion barrier. The graphite oxide-chitosan composite coatings presented the most protective effect.