Journal
JOURNAL OF MAGNESIUM AND ALLOYS
Volume 10, Issue 11, Pages 3217-3233Publisher
KEAI PUBLISHING LTD
DOI: 10.1016/j.jma.2021.09.010
Keywords
AZ31B Mg alloy; Plasma electrolyte oxidation (PEO); Multi-walled carbon nanotubes (MWCNTs); Quasi-in vivo condition; Polycaprolactone (PCL)
Categories
Funding
- Iran National Science Foundation INSF [97014179]
- MCIU/AEI/FEDER, UE [RTI2018-096391-B-C33]
- Regional government of Madrid and EU Structural and Social Funds [S2018/NMT-4411]
- Spanish National Science Foundation (CSIC)
- Ministerio de Ciencia, Innovacion y Universidades (MINECO) [RTI2018-096328-B-I00]
- [RYC-2017-21843]
Ask authors/readers for more resources
This study investigated the effects of multi-walled carbon nanotubes (MWCNTs) and polycaprolactone (PCL) on the quasi-in vivo corrosion behavior of AZ31B Mg alloy treated by plasma electrolytic oxidation (PEO). The findings reveal that the incorporation of MWCNTs modified the PEO coating, resulting in increased roughness, a thicker inner barrier layer, and reduced hydrophilicity. The PEO and PCT ceramic coatings decreased hydrogen generation, with the PCTPCL6 coating exhibiting the lowest amount of collected hydrogen.
This study investigated the effects of multi-walled carbon nanotubes (MWCNTs) and polycaprolactone (PCL) on the quasi-in vivo corrosion behavior of AZ31B Mg alloy treated by plasma electrolytic oxidation (PEO). Thin (-2 mu m, PCTPCL4) and thick (-60 mu m, PCTPCL6) PCL layers were applied only onto the MWCNTs-PEO coating (PCT) as it showed better corrosion performance. Findings reveal that incorporation of MWCNTs induced several structural and functional modifications in the PEO coating, such as increased roughness, a thicker inner barrier layer, and reduced hydrophilicity.Quasi-in vivo corrosion testing was carried out under controlled temperature, pH, and fluid flow in simulated body fluid (SBF) by electrochemical impedance spectroscopy (EIS) and hydrogen evolution experiments. EIS results revealed that, after 48 h immersion, a diffusion process controlled hydration of the ceramic coatings. Comparison of the collected hydrogen after 15 days of immersion in the quasi-in vivo environment revealed that the PEO and PCT ceramic coatings decreased hydrogen generation by up to 74% and 91%, respectively, compared to non-coated alloy. PCTPCL6 coating exhibited the lowest amount of collected hydrogen (0.2 mL/cm2). The thick PCL layer delayed the onset of substrate corrosion for at least 120 h, reducing the corrosion rate by 85% compared with the PCT.(c) 2021 Chongqing University. Publishing services provided by Elsevier B.V. on behalf of KeAi Communications Co. Ltd.This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ )Peer review under responsibility of Chongqing University
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available