Role of particle type and concentration on characteristics of PEO coatings on AM50 magnesium alloy

M. Mohedano; R. Arrabal; B. Mingo; A. Pardo; E. Matykina

doi:10.1016/j.surfcoat.2017.11.058

Role of particle type and concentration on characteristics of PEO coatings on AM50 magnesium alloy

M. Mohedano, R. Arrabal, B. Mingo, A. Pardo, E. Matykina

Universidad Complutense de Madrid

Research output: Contribution to journal › Article › peer-review

Abstract

Composite ceramic coatings were formed on a magnesium alloy by AC plasma electrolytic oxidation using a phosphate-based electrolyte with α-Al₂O₃, monoclinic ZrO₂ or CeO₂ particles in suspension. Effects of particles concentration (2, 5 and 10 g/L) on the electrical response, composition/morphology and corrosion behaviour of the coatings were investigated. Findings revealed successful incorporation of particles, which were preferentially located in the outer coating layer. Due to high temperatures at the locations of microdischarges, zirconia particles underwent transformation from monoclinic to tetragonal structure. The majority of alumina and ceria particles remained unaffected, although some of the alumina particles possibly formed MgAl₂O₄ by reaction with the substrate. Porosity and thickness of the coatings tended to decrease with increasing particles concentration in the electrolyte. Coatings formed in the electrolytes containing CeO₂ particles revealed the best long-term corrosion performance in 0.5 wt% NaCl solution.

Original language	English
Pages (from-to)	328-335
Number of pages	8
Journal	Surface and Coatings Technology
Volume	334
Early online date	23 Nov 2017
DOIs	https://doi.org/10.1016/j.surfcoat.2017.11.058
Publication status	Published - 25 Jan 2018

Keywords

Characterization
Corrosion
Magnesium
Particles
PEO

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10.1016/j.surfcoat.2017.11.058

https://bura.brunel.ac.uk/handle/2438/13994

Cite this

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title = "Role of particle type and concentration on characteristics of PEO coatings on AM50 magnesium alloy",

abstract = "Composite ceramic coatings were formed on a magnesium alloy by AC plasma electrolytic oxidation using a phosphate-based electrolyte with α-Al2O3, monoclinic ZrO2 or CeO2 particles in suspension. Effects of particles concentration (2, 5 and 10 g/L) on the electrical response, composition/morphology and corrosion behaviour of the coatings were investigated. Findings revealed successful incorporation of particles, which were preferentially located in the outer coating layer. Due to high temperatures at the locations of microdischarges, zirconia particles underwent transformation from monoclinic to tetragonal structure. The majority of alumina and ceria particles remained unaffected, although some of the alumina particles possibly formed MgAl2O4 by reaction with the substrate. Porosity and thickness of the coatings tended to decrease with increasing particles concentration in the electrolyte. Coatings formed in the electrolytes containing CeO2 particles revealed the best long-term corrosion performance in 0.5 wt% NaCl solution.",

keywords = "Characterization, Corrosion, Magnesium, Particles, PEO",

author = "M. Mohedano and R. Arrabal and B. Mingo and A. Pardo and E. Matykina",

year = "2018",

month = jan,

day = "25",

doi = "10.1016/j.surfcoat.2017.11.058",

language = "English",

volume = "334",

pages = "328--335",

journal = "Surface and Coatings Technology",

issn = "0257-8972",

publisher = "Elsevier BV",

}

TY - JOUR

T1 - Role of particle type and concentration on characteristics of PEO coatings on AM50 magnesium alloy

AU - Mohedano, M.

AU - Arrabal, R.

AU - Mingo, B.

AU - Pardo, A.

AU - Matykina, E.

PY - 2018/1/25

Y1 - 2018/1/25

N2 - Composite ceramic coatings were formed on a magnesium alloy by AC plasma electrolytic oxidation using a phosphate-based electrolyte with α-Al2O3, monoclinic ZrO2 or CeO2 particles in suspension. Effects of particles concentration (2, 5 and 10 g/L) on the electrical response, composition/morphology and corrosion behaviour of the coatings were investigated. Findings revealed successful incorporation of particles, which were preferentially located in the outer coating layer. Due to high temperatures at the locations of microdischarges, zirconia particles underwent transformation from monoclinic to tetragonal structure. The majority of alumina and ceria particles remained unaffected, although some of the alumina particles possibly formed MgAl2O4 by reaction with the substrate. Porosity and thickness of the coatings tended to decrease with increasing particles concentration in the electrolyte. Coatings formed in the electrolytes containing CeO2 particles revealed the best long-term corrosion performance in 0.5 wt% NaCl solution.

AB - Composite ceramic coatings were formed on a magnesium alloy by AC plasma electrolytic oxidation using a phosphate-based electrolyte with α-Al2O3, monoclinic ZrO2 or CeO2 particles in suspension. Effects of particles concentration (2, 5 and 10 g/L) on the electrical response, composition/morphology and corrosion behaviour of the coatings were investigated. Findings revealed successful incorporation of particles, which were preferentially located in the outer coating layer. Due to high temperatures at the locations of microdischarges, zirconia particles underwent transformation from monoclinic to tetragonal structure. The majority of alumina and ceria particles remained unaffected, although some of the alumina particles possibly formed MgAl2O4 by reaction with the substrate. Porosity and thickness of the coatings tended to decrease with increasing particles concentration in the electrolyte. Coatings formed in the electrolytes containing CeO2 particles revealed the best long-term corrosion performance in 0.5 wt% NaCl solution.

KW - Characterization

KW - Corrosion

KW - Magnesium

KW - Particles

KW - PEO

U2 - 10.1016/j.surfcoat.2017.11.058

DO - 10.1016/j.surfcoat.2017.11.058

M3 - Article

AN - SCOPUS:85034848690

VL - 334

SP - 328

EP - 335

JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

SN - 0257-8972

ER -

Role of particle type and concentration on characteristics of PEO coatings on AM50 magnesium alloy

Abstract

Keywords

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