Comparative study of different environmentally friendly (Chromium-free) methods for surface modification of pure magnesium

A. A. Zuleta; E. Correa; C. Villada; M. Sepúlveda; J. G. Castaño; F. Echeverría

doi:10.1016/j.surfcoat.2011.05.048

Comparative study of different environmentally friendly (Chromium-free) methods for surface modification of pure magnesium

A. A. Zuleta, E. Correa, C. Villada, M. Sepúlveda, J. G. Castaño, F. Echeverría

Research output: Contribution to journal › Article in an indexed scientific journal › peer-review

30 Scopus citations

Abstract

In this work, three different chromium-free methods of surface modification of pure magnesium were studied; namely, a cerium conversion coating, a carbonated coating and an anodic film. Scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS), micro Raman spectroscopy (MRS) and X-ray diffraction (XRD) were employed to study the morphology and composition of the surface after treatments. The corrosion resistance of the treated surfaces was evaluated by means of electrochemical impedance spectroscopy (EIS). XRD and MRS showed that conversion coatings obtained from cerium salts consisted of cerium oxides and hydroxides and the major component of the layer was CeO₂. The morphology of the cerium conversion coating consisted of a fiber-like structure that exhibited several network-like cracks. The carbonated coating was mainly composed of aragonitic CaCO_3, whereas the oxide layer formed in the anodizing process was a porous film made of MgO and some phosphate species compounds. The results of EIS tests indicated that calcium carbonated coating provided higher corrosion protection.

Original language	English
Pages (from-to)	5254-5259
Number of pages	6
Journal	Surface and Coatings Technology
Volume	205
Issue number	23-24
DOIs	https://doi.org/10.1016/j.surfcoat.2011.05.048
State	Published - 25 Sep 2011
Externally published	Yes

Bibliographical note

Funding Information:
The authors are grateful to “Departamento Administrativo de Ciencia, Tecnología e Innovación–COLCIENCIAS” and University of Antioquia for financial assistance to the project 111545221131, to Professor Jun Yen Uan, Department of Materials Science and Engineering National from Chung Hsing University – Taiwan and to Dr. Facundo Ruiz, Cuerpo Académico de Materiales, for provision of time on the X-Ray difractometer of the Universidad Autónoma de San Luis Potosí– México.

Keywords

Anodizing
Calcium carbonate
Cerium
Chromium-free treatment
Conversion coating
Magnesium

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10.1016/j.surfcoat.2011.05.048

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title = "Comparative study of different environmentally friendly (Chromium-free) methods for surface modification of pure magnesium",

abstract = "In this work, three different chromium-free methods of surface modification of pure magnesium were studied; namely, a cerium conversion coating, a carbonated coating and an anodic film. Scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS), micro Raman spectroscopy (MRS) and X-ray diffraction (XRD) were employed to study the morphology and composition of the surface after treatments. The corrosion resistance of the treated surfaces was evaluated by means of electrochemical impedance spectroscopy (EIS). XRD and MRS showed that conversion coatings obtained from cerium salts consisted of cerium oxides and hydroxides and the major component of the layer was CeO2. The morphology of the cerium conversion coating consisted of a fiber-like structure that exhibited several network-like cracks. The carbonated coating was mainly composed of aragonitic CaCO3, whereas the oxide layer formed in the anodizing process was a porous film made of MgO and some phosphate species compounds. The results of EIS tests indicated that calcium carbonated coating provided higher corrosion protection.",

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author = "Zuleta, {A. A.} and E. Correa and C. Villada and M. Sep{\'u}lveda and Casta{\~n}o, {J. G.} and F. Echeverr{\'i}a",

note = "Funding Information: The authors are grateful to “Departamento Administrativo de Ciencia, Tecnolog{\'i}a e Innovaci{\'o}n–COLCIENCIAS” and University of Antioquia for financial assistance to the project 111545221131, to Professor Jun Yen Uan, Department of Materials Science and Engineering National from Chung Hsing University – Taiwan and to Dr. Facundo Ruiz, Cuerpo Acad{\'e}mico de Materiales, for provision of time on the X-Ray difractometer of the Universidad Aut{\'o}noma de San Luis Potos{\'i}– M{\'e}xico.",

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AU - Zuleta, A. A.

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AU - Villada, C.

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AU - Castaño, J. G.

AU - Echeverría, F.

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N2 - In this work, three different chromium-free methods of surface modification of pure magnesium were studied; namely, a cerium conversion coating, a carbonated coating and an anodic film. Scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS), micro Raman spectroscopy (MRS) and X-ray diffraction (XRD) were employed to study the morphology and composition of the surface after treatments. The corrosion resistance of the treated surfaces was evaluated by means of electrochemical impedance spectroscopy (EIS). XRD and MRS showed that conversion coatings obtained from cerium salts consisted of cerium oxides and hydroxides and the major component of the layer was CeO2. The morphology of the cerium conversion coating consisted of a fiber-like structure that exhibited several network-like cracks. The carbonated coating was mainly composed of aragonitic CaCO3, whereas the oxide layer formed in the anodizing process was a porous film made of MgO and some phosphate species compounds. The results of EIS tests indicated that calcium carbonated coating provided higher corrosion protection.

AB - In this work, three different chromium-free methods of surface modification of pure magnesium were studied; namely, a cerium conversion coating, a carbonated coating and an anodic film. Scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS), micro Raman spectroscopy (MRS) and X-ray diffraction (XRD) were employed to study the morphology and composition of the surface after treatments. The corrosion resistance of the treated surfaces was evaluated by means of electrochemical impedance spectroscopy (EIS). XRD and MRS showed that conversion coatings obtained from cerium salts consisted of cerium oxides and hydroxides and the major component of the layer was CeO2. The morphology of the cerium conversion coating consisted of a fiber-like structure that exhibited several network-like cracks. The carbonated coating was mainly composed of aragonitic CaCO3, whereas the oxide layer formed in the anodizing process was a porous film made of MgO and some phosphate species compounds. The results of EIS tests indicated that calcium carbonated coating provided higher corrosion protection.

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KW - Calcium carbonate

KW - Cerium

KW - Chromium-free treatment

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Comparative study of different environmentally friendly (Chromium-free) methods for surface modification of pure magnesium

Abstract

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Keywords

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