Improving corrosion protection of Mg alloys (AZ31B) using graphene-based hybrid coatings
| Main Authors: | Afsharimani N., Talimian A., Merino E., Durán A., Castro Y., Galusek D. |
|---|---|
| Format: | Article Journal |
| Bahasa: | eng |
| Terbitan: |
, 2021
|
| Online Access: |
https://zenodo.org/record/5569107 |
Daftar Isi:
- In the present work, a study was carried out to compare the morphology andelectrochemical properties of pure and graphene-modified hybrid silica sol–gel coatings deposited on anodized AZ31B magnesium alloys. The precursorsolution was prepared using tetraethoxysilane (TEOS) and 3-glycidoxypropyl-trimethoxysilane (GPTMS), with the addition of chemically modified graphenenanosheets (GN-chem). Homogeneous and adherent coatings were obtainedusing GPTMS-TEOS (GT) and GPTMS-TEOS-GN-chem (GT/GN-chem) solu-tions with uniform thickness around 4μm. Raman, SEM images and EDS analy-ses confirmed the presence of graphene nanosheets in the coatings. Potentiody-namic polarization results using 0.05 M NaCl electrolyte solution showed thatgraphene containing silica coatings significantly improve the corrosion resis-tance of AZ31B alloys. In addition, a significant passive region was observed forGT/GN-chem coatings.
- barrier properties, corrosion protection, graphene nanosheets, magnesium alloy, sol–gelcoatings