Plasma Electrolytic Oxidation on Magnesium AZ31 with Sepiolite as Inhibitor Carrier for Improved Corrosion Protection-Reference-Cited by-同舟云学术

Plasma Electrolytic Oxidation on Magnesium AZ31 with Sepiolite as Inhibitor Carrier for Improved Corrosion Protection

Published:2023-08-30 Issue:3 Volume:4 Page:488-502
ISSN:2624-5558
Container-title:Corrosion and Materials Degradation
language:en
Short-container-title:CMD

Author:

Sottor Robert¹,Gruen Ricarda¹²,Kremmer Kerstin³^ORCID,Lederer Stephan¹,Schneider Michael³^ORCID,Fuerbeth Wolfram¹^ORCID

Affiliation:

1. DECHEMA Research Institute, 60486 Frankfurt am Main, Germany

2. Department of Chemical and Process Engineering, Karlsruher Institut für Technologie, Kaiserstraße 12, 76131 Karlsruhe, Germany

3. Fraunhofer Institute for Ceramic Technologies and Systems IKTS, 01277 Dresden, Germany

Abstract

Plasma electrolytic oxidation (PEO) in an alkaline silicate electrolyte containing nanosized sepiolite fibers was carried out on magnesium alloy AZ31. The mineral fibers were loaded with different corrosion inhibitors and incorporated in situ during the PEO treatment. The composition and microstructure of the PEO coatings were investigated by SEM. It was shown that the fibers are located on the surface as well as inside the “weak spots” of the coating, i.e., pores and discharge channels. The fixation of the particles is caused by sintering due to the heat developed during the PEO treatment. Investigations using electrochemical impedance spectroscopy and linear sweep voltammetry in 0.01 M NaCl solution confirmed an improvement of the corrosion protection. The use of the inhibitors shifts the critical pitting potential in the anodic direction. Regarding efficiency, cerium-loaded sepiolite showed the best behavior by shifting the pitting potential by +0.9 V.

Funder

German Federal Ministry for Economic Affairs and Climate Action

Publisher

MDPI AG

Subject

General Medicine

Link

https://www.mdpi.com/2624-5558/4/3/25/pdf

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