Corrosion resistance of multistep doped graphene oxide/lanthanum-based/silane composite coatings on the magnesium alloys

Abstract

In this study, rare earth lanthanum-based conversion coating (La) was prepared by self-assembly multistep method, and then graphene oxide was spin-coated on the surface of lanthanum-based conversion coating (La/GO) by a spin coating method. The composite coating was coated by a silane coupling agent with better adhesion and coating, and the composite coating (La/GO/GLYMO) with excellent corrosion resistance was prepared. The results showed that the surface of the La/GO/GLYMO coating had the least pitting holes, and the impedance modulus increased by at least three orders of magnitude compared to the La coating after soaking for 72 h.

Keywords:

• Composite coating
• corrosion resistance
• graphene oxide
• magnesium alloys

Acknowledgments

This work was supported by the Program of Natural Science Foundation of Ningxia (Grant No. 2020AAC03193).

Ethical statement

The author declares that all content is original and has not been submitted to other journals at the same time.