Effects of NaAlO2 concentration on microstructure and performance of micro-arc oxidation coatings formed on magnesium

Weiyi Mu; Yong Han; Limin Zhang

Effects of NaAlO₂ concentration on microstructure and performance of micro-arc oxidation coatings formed on magnesium

Weiyi Mu
, Yong Han
, Limin Zhang

School of Materials Science and Engineering

Xi'an Jiaotong University
Xi'an College of Engineering and Technology

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

3 Scopus citations

Abstract

Ceramic coatings were fabricated on magnesium by micro-arc oxidation (MAO) under constant potential in NaAlO₂ solution, and the effects of NaAlO₂ concentration on the surface morphologies, phase composition and surface hardness of the MAO coatings were investigated. Corrosion resistance of the coatings in different NaAlO₂ concentrations and the untreated magnesium were evaluated with the potentiodynamic polarization tester. The results show that with increasing NaAlO₂ concentration the micro-pores of MAO coating decrease, while the average surface hardness increases. The MAO coating is mainly composed of MgO and MgAl₂O₄, and the content of MgAl₂O₄ increases with the increasing NaAlO₂ concentration. With NaAlO₂ concentration increasing, the corrosion potential of the MAO coating in 3.5% NaCl solution increases. MAO coating enables to effectively improve the corrosion resistance of magnesium.

Original language	English
Pages (from-to)	847-851
Number of pages	5
Journal	Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University
Volume	41
Issue number	7
State	Published - Jul 2007

Keywords

Corrosion resistance
Magnesium
Micro-arc oxidation
Microstructure

Cite this

@article{ee5764f7cd1b45d08960fdea5956792a,

title = "Effects of NaAlO2 concentration on microstructure and performance of micro-arc oxidation coatings formed on magnesium",

abstract = "Ceramic coatings were fabricated on magnesium by micro-arc oxidation (MAO) under constant potential in NaAlO2 solution, and the effects of NaAlO2 concentration on the surface morphologies, phase composition and surface hardness of the MAO coatings were investigated. Corrosion resistance of the coatings in different NaAlO2 concentrations and the untreated magnesium were evaluated with the potentiodynamic polarization tester. The results show that with increasing NaAlO2 concentration the micro-pores of MAO coating decrease, while the average surface hardness increases. The MAO coating is mainly composed of MgO and MgAl2O4, and the content of MgAl2O4 increases with the increasing NaAlO2 concentration. With NaAlO2 concentration increasing, the corrosion potential of the MAO coating in 3.5\% NaCl solution increases. MAO coating enables to effectively improve the corrosion resistance of magnesium.",

keywords = "Corrosion resistance, Magnesium, Micro-arc oxidation, Microstructure",

author = "Weiyi Mu and Yong Han and Limin Zhang",

year = "2007",

month = jul,

language = "英语",

volume = "41",

pages = "847--851",

journal = "Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University",

issn = "0253-987X",

publisher = "Xi'an Jiaotong University",

number = "7",

}

TY - JOUR

T1 - Effects of NaAlO2 concentration on microstructure and performance of micro-arc oxidation coatings formed on magnesium

AU - Mu, Weiyi

AU - Han, Yong

AU - Zhang, Limin

PY - 2007/7

Y1 - 2007/7

N2 - Ceramic coatings were fabricated on magnesium by micro-arc oxidation (MAO) under constant potential in NaAlO2 solution, and the effects of NaAlO2 concentration on the surface morphologies, phase composition and surface hardness of the MAO coatings were investigated. Corrosion resistance of the coatings in different NaAlO2 concentrations and the untreated magnesium were evaluated with the potentiodynamic polarization tester. The results show that with increasing NaAlO2 concentration the micro-pores of MAO coating decrease, while the average surface hardness increases. The MAO coating is mainly composed of MgO and MgAl2O4, and the content of MgAl2O4 increases with the increasing NaAlO2 concentration. With NaAlO2 concentration increasing, the corrosion potential of the MAO coating in 3.5% NaCl solution increases. MAO coating enables to effectively improve the corrosion resistance of magnesium.

AB - Ceramic coatings were fabricated on magnesium by micro-arc oxidation (MAO) under constant potential in NaAlO2 solution, and the effects of NaAlO2 concentration on the surface morphologies, phase composition and surface hardness of the MAO coatings were investigated. Corrosion resistance of the coatings in different NaAlO2 concentrations and the untreated magnesium were evaluated with the potentiodynamic polarization tester. The results show that with increasing NaAlO2 concentration the micro-pores of MAO coating decrease, while the average surface hardness increases. The MAO coating is mainly composed of MgO and MgAl2O4, and the content of MgAl2O4 increases with the increasing NaAlO2 concentration. With NaAlO2 concentration increasing, the corrosion potential of the MAO coating in 3.5% NaCl solution increases. MAO coating enables to effectively improve the corrosion resistance of magnesium.

KW - Corrosion resistance

KW - Magnesium

KW - Micro-arc oxidation

KW - Microstructure

UR - https://www.scopus.com/pages/publications/34547992478

M3 - 文章

AN - SCOPUS:34547992478

SN - 0253-987X

VL - 41

SP - 847

EP - 851

JO - Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University

JF - Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University

IS - 7

ER -

Effects of NaAlO₂ concentration on microstructure and performance of micro-arc oxidation coatings formed on magnesium

Abstract

Keywords

Other files and links

Fingerprint

Cite this