Self-Healing Engineered Multilayer Coatings for Corrosion Protection of Magnesium Alloy AZ31B

被引：0

作者：

Aparicio, Mario ^{[1
]}

Mosa, Jadra ^{[1
]}

Gomez-Herrero, Miguel ^{[1
]}

Abd Al-Jaleel, Zainab ^{[2
]}

Guzman, Jennifer ^{[2
]}

Jitianu, Mihaela ^{[3
]}

Klein, Lisa C. ^{[4
]}

Jitianu, Andrei ^{[2
,5
]}

机构：

[1] CSIC, Inst Ceram & Vidrio, Madrid 28049, Spain

[2] CUNY, Lehman Coll, Dept Chem, New York, NY 10468 USA

[3] William Paterson Univ, Dept Chem, Wayne, NJ 07470 USA

[4] Rutgers State Univ, Dept Mat Sci & Engn, Piscataway, NJ 08854 USA

[5] CUNY, Grad Ctr, PhD Program Chem & Biochem, New York, NY 10016 USA

来源：

ACS MATERIALS AU | 2025年 / 5卷 / 02期

关键词：

Self-healing coating; Hybridglass; Cerium(III) ion doping; Sol-Gel process; Corrosionprotection; Magnesium alloys; SOL-GEL COATINGS; BEHAVIOR; 304-STAINLESS-STEEL; NANOPARTICLES; FILMS; ACID;

D O I：

10.1021/acsmaterialsau.4c00170

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Nonporous, crack-free hybrid glass coatings have provided excellent corrosion protection to the AZ31B magnesium alloy. However, if a crack develops in the coatings, then corrosion will proliferate at that point. The novelty of this study consists of engineering a bilayer protection system that combines the "barrier" properties of the hybrid glass coatings with the "inhibitor" or "self-healing" effect of an internal layer of mesoporous silica doped with cerium(III) ions. The mesoporous layer was obtained using a sol-gel solution with 1 mol % cerium(III) ions. The inner cerium-doped mesoporous coating has a thickness of 0.25 mu m, and the electrochemical characterization through Open circuit potential (OCP) and Electrochemical Impedance Spectroscopy (EIS) indicates a corrosion inhibition process provided by cerium(III) ions triggered by the corrosion. The combination of the Ce-doped and hybrid glass coatings reaches a total thickness of 5.1 mu m. The corrosion evaluation through OCP and EIS does not show any evidence of corrosion during the first 575 h of immersion. After this, there are several steps of a sudden drop in potential and subsequent recovery of the previous values, which could be associated with the activation of the corrosion inhibition mechanism provided by the Ce (III) ions. EIS show a maximum impedance module of 106.7 Ohm cm2, a decrease of impedance values and phase angle fluctuations after the potential drops observed, and, then, a recovery of the previous values of impedance and phase angle. This behavior confirms activation of the corrosion inhibition mechanism. Polarization curves shows that the multilayer coating leads to a low current density (similar to 10-11 A cm-2), around 5 orders of magnitude lower in comparison with the bare substrate. A post-mortem SEM-EDX analysis study, performed on the cracks generated during electrochemical testing, shows the accumulation of cerium as a consequence of the corrosion inhibitory process.

引用

页码：409 / 420

页数：12