Calcium Doped Flash-PEO Coatings for Corrosion Protection of Mg Alloy
Ewa Wierzbicka,Borja Pillado,Marta Mohedano,Raul Arrabal,Endzhe Matykina +4 more
- Vol. 10, Iss: 7, pp 916
TLDR
In this article, the authors demonstrate a significant improvement of the corrosion resistance of an AZ31B magnesium alloy achieved by the application of 1 μm-thin coatings generated by an environmentally friendly flash plasma electrolytic oxidation (FPEO) process in Ca-containing electrolytes.Abstract:
This study demonstrates a significant improvement of the corrosion resistance of an AZ31B magnesium alloy achieved by the application of 1 μm-thin coatings generated by an environmentally friendly flash plasma electrolytic oxidation (FPEO) process in Ca-containing electrolytes. Two compounds with different solubility, calcium oxide (CaO) or calcium glycerophosphate (CaGlyP), were used as sources of Ca in the electrolyte. Very short durations (20–45 s) of the FPEO process were employed with the aim of limiting the energy consumption. The corrosion performance of the developed coatings was compared with that of a commercial conversion coating (CC) of similar thickness. The viability of the coatings in a full system protection approach, consisting of FPEO combined with an inhibitor-free epoxy primer, was verified in neutral salt spray and paint adhesion tests. The superior corrosion performance of the FPEO_CaGlyP coating, both as a stand-alone coating and as a full system, was attributed to the formation of a greater complexity of Ca2+ bonds with SiO2 and PO43− species within the MgO ceramic network during the in situ incorporation of Ca into the coating from a double chelated electrolyte and the resultant difficulties with the hydrolysis of such a network. The deterioration of the FPEO_CaGlyP coating during immersion was found over ten times slower compared with Ca-free flash-PEO coating.read more
Citations
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Flash-PEO as an alternative to chromate conversion coatings for corrosion protection of Mg alloy
Ewa Wierzbicka,Bahram Vaghefinazari,Sviatlana V. Lamaka,Mikhail L. Zheludkevich,Marta Mohedano,Lara Moreno,Pieter Visser,A. Rodriguez,J. Velasco,Raul Arrabal,Endzhe Matykina +10 more
TL;DR: In this article, a flash-PEO coating is developed on AZ31B alloy in a combination of silicate, phosphate, and fluoride based electrolyte in order to offer a green alternative to chromate conversion coatings.
Journal ArticleDOI
Graphene Family Nanomaterial Reinforced Magnesium-Based Matrix Composites for Biomedical Application: A Comprehensive Review
TL;DR: In this paper, the most pertinent research performed in the direction of Mg-based composites encapsulated within GFNs is designed to wrap up and explore some pertinent research directions in the field of GFN-embedded Mg based composites.
Journal ArticleDOI
Corrosion properties and surface free energy of the ZnAl LDH/rGO coating on MAO pretreated AZ31 magnesium alloy
Vahdat Zahedi Asl,Seyed Farshid Chini,Jingmao Zhao,Yahya Palizdar,Majid Shaker,Alireza Sadeghi +5 more
TL;DR: In this article, effective and environmentally friendly materials, layered double hydroxides (LDH), with and without combination of rGO (reduced graphene oxide) nanosheets, were employed to seal the pores and micro-cracks in order to enhance the anti-corrosion and degradation performance of the MAO coating on AZ31.
Journal ArticleDOI
Bioactivity Performance of Pure Mg after Plasma Electrolytic Oxidation in Silicate-Based Solutions.
Yevheniia Husak,Joanna Michalska,Oleksandr Oleshko,Viktoriia Korniienko,Karlis Grundsteins,Bohdan Dryhval,Sahin Altundal,Sahin Altundal,Oleg Mishchenko,Roman Viter,Maksym Pogorielov,Wojciech Simka +11 more
TL;DR: In this paper, an Mg stable oxide coating using plasma electrolytic oxidation (PEO) in silicate-based solutions was developed, where 99.9% pure Mg alloy was anodized in electrolytes contained mixtures of sodium silicate and sodium fluoride, calcium hydroxide and sodium hydroxides.
Journal ArticleDOI
Characterisation Method of the Passivation Mechanisms during the pre-discharge Stage of Plasma Electrolytic Oxidation Indicating the Mode of Action of Fluorides in PEO of Magnesium
TL;DR: In this paper, a method for the systematic investigation of the substrate/electrolyte interactions during the pre-discharge stage is presented, which allows for a quantitative characterisation of the passivation behavior, based on a small electrolyte volume.
References
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Journal ArticleDOI
Corrosion of magnesium
G. L. Makar,J. Kruger +1 more
TL;DR: Magnesium alloys have high strength/weight ratios, but poor corrosion resistance affects the viability of increased magnesium usage in aerospace and other applications as discussed by the authors, and this review approaches the p...
Journal ArticleDOI
Accurate electrochemical measurement of magnesium corrosion rates; A combined impedance, mass-loss and hydrogen collection study
TL;DR: In this paper, experiments were conducted to enable the simultaneous measurement of electrochemical impedance and collection of hydrogen gas during the corrosion of pure magnesium in NaCl solutions, which provided three unique measures of magnesium corrosion for the same specimen.
Journal ArticleDOI
An Impedance Investigation of the Mechanism of Pure Magnesium Corrosion in Sodium Sulfate Solutions
Geneviève Baril,Gonzalo Galicia,Claude Deslouis,Nadine Pébère,Bernard Tribollet,Vincent Vivier +5 more
TL;DR: In this paper, the corrosion behavior of pure magnesium in sodium sulfate solutions was investigated using voltammetry and electrochemical impedance spectroscopy with a rotating disk electrode, and the analysis of impedance data obtained at the corrosion potential was consistent with the hypothesis that Mg corrosion is controlled by the presence of a very thin oxide film, probably MgO, and that the dissolution occurs at film-free spots only.
Journal ArticleDOI
Corrosion resistance of a self-healing micro-arc oxidation/polymethyltrimethoxysilane composite coating on magnesium alloy AZ31
TL;DR: In this paper, a micro-arc oxidation (MAO)/polymethyltrimethoxysilane (PMTMS) hybrid coating was fabricated via MAO processing and subsequent sealing with alkaline treatment and PMTMS.
Journal ArticleDOI
A review of recent work on discharge characteristics during plasma electrolytic oxidation of various metals
T.W. Clyne,S.C. Troughton +1 more
TL;DR: In this paper, a review describes recent progress on understanding and quantification of the various phenomena that take place during plasma electrolytic oxidation, which is in increasing industrial use for pro...