Self-healing Coating by Using Pore of Porous Film Formed on Al Alloy Anodized and Effect of Pore-Widening Treatment on Corrosion Protection

Abstract

In this study, advanced coating with self-healing property for corrosion protection of Al alloy was developed. This coating can be formed on Al alloy anodized, and pores in porous type of anodic oxide film formed on Al substrate was filled by a healing agent of coating. It is clear that the defect formed by mechanical damage was covered by self-healing structure, when this coating formed on Al surface was damaged. And corrosion protection also keep high if this coating was damaged.

Self-Healing Coatings Consisting of an Outer Electrodeposited Epoxy Resin Layer and an Inner Porous Anodic Oxide Layer with Healing Agents for the Corrosion Protection of Al Alloys

“…This is discussed in Section 4.1. In previous studies, the authors of this paper found that a Cu 2+ /Cl − solution is significantly useful for detecting imperfections in oxide films on Al alloys [18,19,22,23]. Cu 2+ and Cl − ions synergistically enhance the local corrosion of Al alloys through imperfections.…”

“…However, the synthesis of the capsule includes relatively complex processes and gives low yields of capsules. In order to solve this problem, the authors developed a new type of self-healing coating [22,23]. In the new process, Al alloys are anodized in oxalic acid solutions to form porous anodic oxide films [24][25][26][27][28][29][30], and the pores of the anodic oxide film are filled with healing agents.…”