title: Layer-by-Layer Assembly of a Self-Healing Anticorrosion Coating on Magnesium Alloys.
abstract: Fabrication of self-healing anticorrosion coatings has attracted attention as it has the ability to extend the service life and prevent the substrate from corrosive attack. However, a coating system with a rapid self-healing ability and an improved corrosion resistance is rarely reported. In this work, we developed a self-healing anticorrosion coating on a magnesium alloy (AZ31). The coating comprises a cerium-based conversion layer, a graphene oxide layer, and a branched poly(ethylene imine) (PEI)/poly(acrylic acid) (PAA) multilayer. We incorporated the graphene oxide as corrosion inhibitors and used the PEI/PAA multilayers to provide the self-healing ability to the coating systems. X-ray diffraction (XRD) and Raman spectroscopy were used to characterize the composition of the multilayers, and scanning electron microscopy (SEM) was used to analyze the surface morphology. The electrochemical impedance spectroscopy (EIS) results illustrate the improved corrosion resistance of the coating. The proposed coating also has a rapid self-healing ability in the presence of water.
authors.affiliation: Department of Mechanical Engineering, College of Engineering, University of Saskatchewan , 57 Campus Drive, Saskatoon, Saskatchewan S7N 5A9, Canada.
authors.forename: Fan
authors.initials: F
authors.lastname: Fan
authors.affiliation: Department of Mechanical Engineering, College of Engineering, University of Saskatchewan , 57 Campus Drive, Saskatoon, Saskatchewan S7N 5A9, Canada.
authors.forename: Chunyu
authors.initials: C
authors.lastname: Zhou
authors.affiliation: Department of Mechanical Engineering, College of Engineering, University of Saskatchewan , 57 Campus Drive, Saskatoon, Saskatchewan S7N 5A9, Canada.
authors.forename: Xu
authors.initials: X
authors.lastname: Wang
authors.affiliation: Department of Mechanical Engineering, College of Engineering, University of Saskatchewan , 57 Campus Drive, Saskatoon, Saskatchewan S7N 5A9, Canada.
authors.forename: Jerzy
authors.initials: J
authors.lastname: Szpunar
keywords: anticorrosion; coating; graphene oxide; layer-by-layer; self-healing