Surface chemistry, film morphology, local electrochemical behavior and cytotoxic response of anodized AZ31B magnesium alloy
This work investigates the effect of current density on the surface chemistry, film morphology, cytotoxic response, global and local electrochemical behaviors of AZ31B alloy anodized in 1.0 M NaOH + 0.5 M Na2SiO3 solution. Three different current densities, namely 5, 10 and 20 mA cm−2 were tested. T...
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| Format: | Article |
| Language: | English |
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Elsevier
2020-11-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785420319220 |
| _version_ | 1818414339235774464 |
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| author | Leandro Antonio de Oliveira Rejane Maria Pereira da Silva Andrea Cecilia Dorion Rodas Ricardo M. Souto Renato Altobelli Antunes |
| author_facet | Leandro Antonio de Oliveira Rejane Maria Pereira da Silva Andrea Cecilia Dorion Rodas Ricardo M. Souto Renato Altobelli Antunes |
| author_sort | Leandro Antonio de Oliveira |
| collection | DOAJ |
| description | This work investigates the effect of current density on the surface chemistry, film morphology, cytotoxic response, global and local electrochemical behaviors of AZ31B alloy anodized in 1.0 M NaOH + 0.5 M Na2SiO3 solution. Three different current densities, namely 5, 10 and 20 mA cm−2 were tested. The surface morphology and thickness of the anodized layers were examined by scanning electron microscopy. The surface chemical states were assessed by X-ray photoelectron spectroscopy. The corrosion resistance was evaluated in phosphate-buffered saline (PBS) based on electrochemical impedance spectroscopy and potentiodynamic polarization measurements. The use of scanning probe techniques with physicochemical resolution, the scanning electrochemical microscopy (SECM) and the scanning Kelvin probe (SKP), allowed the best corrosion behavior to be assigned to the sample anodized using a current density of 20 mA cm−2. Altogether, these methods allowed to establish that the anodizing current density imposed to the magnesium alloy had a major effect on the morphology and composition of the surface layers, and produced changes in their electrochemical behavior. In vitro cytotoxicity tests using the MTS assay demonstrated that the good biocompatibility of the AZ31B magnesium alloy was not damaged by the surface layers formed during the anodization treatment. |
| first_indexed | 2024-12-14T11:17:31Z |
| format | Article |
| id | doaj.art-8d341f3592ed42728f73c1e1f96ae87e |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-12-14T11:17:31Z |
| publishDate | 2020-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-8d341f3592ed42728f73c1e1f96ae87e2022-12-21T23:03:56ZengElsevierJournal of Materials Research and Technology2238-78542020-11-01961475414770Surface chemistry, film morphology, local electrochemical behavior and cytotoxic response of anodized AZ31B magnesium alloyLeandro Antonio de Oliveira0Rejane Maria Pereira da Silva1Andrea Cecilia Dorion Rodas2Ricardo M. Souto3Renato Altobelli Antunes4Centro de Engenharia, Modelagem e Ciências Sociais Aplicadas (CECS), Universidade Federal do ABC (UFABC), Santo André, 09210-580, Brazil; Corresponding author.Instituto de Pesquisas Energéticas e Nucleares, IPEN/CNEN, Av. Prof. Lineu Prestes, 2242, São Paulo, BrazilCentro de Engenharia, Modelagem e Ciências Sociais Aplicadas (CECS), Universidade Federal do ABC (UFABC), Santo André, 09210-580, BrazilDepartment of Chemistry, University of La Laguna, P.O. Box 456, La Laguna, Tenerife, 38200, SpainCentro de Engenharia, Modelagem e Ciências Sociais Aplicadas (CECS), Universidade Federal do ABC (UFABC), Santo André, 09210-580, BrazilThis work investigates the effect of current density on the surface chemistry, film morphology, cytotoxic response, global and local electrochemical behaviors of AZ31B alloy anodized in 1.0 M NaOH + 0.5 M Na2SiO3 solution. Three different current densities, namely 5, 10 and 20 mA cm−2 were tested. The surface morphology and thickness of the anodized layers were examined by scanning electron microscopy. The surface chemical states were assessed by X-ray photoelectron spectroscopy. The corrosion resistance was evaluated in phosphate-buffered saline (PBS) based on electrochemical impedance spectroscopy and potentiodynamic polarization measurements. The use of scanning probe techniques with physicochemical resolution, the scanning electrochemical microscopy (SECM) and the scanning Kelvin probe (SKP), allowed the best corrosion behavior to be assigned to the sample anodized using a current density of 20 mA cm−2. Altogether, these methods allowed to establish that the anodizing current density imposed to the magnesium alloy had a major effect on the morphology and composition of the surface layers, and produced changes in their electrochemical behavior. In vitro cytotoxicity tests using the MTS assay demonstrated that the good biocompatibility of the AZ31B magnesium alloy was not damaged by the surface layers formed during the anodization treatment.http://www.sciencedirect.com/science/article/pii/S2238785420319220AZ31B magnesium alloyAnodizing pretreatmentCorrosion resistanceCytotoxicitySECMSKP |
| spellingShingle | Leandro Antonio de Oliveira Rejane Maria Pereira da Silva Andrea Cecilia Dorion Rodas Ricardo M. Souto Renato Altobelli Antunes Surface chemistry, film morphology, local electrochemical behavior and cytotoxic response of anodized AZ31B magnesium alloy Journal of Materials Research and Technology AZ31B magnesium alloy Anodizing pretreatment Corrosion resistance Cytotoxicity SECM SKP |
| title | Surface chemistry, film morphology, local electrochemical behavior and cytotoxic response of anodized AZ31B magnesium alloy |
| title_full | Surface chemistry, film morphology, local electrochemical behavior and cytotoxic response of anodized AZ31B magnesium alloy |
| title_fullStr | Surface chemistry, film morphology, local electrochemical behavior and cytotoxic response of anodized AZ31B magnesium alloy |
| title_full_unstemmed | Surface chemistry, film morphology, local electrochemical behavior and cytotoxic response of anodized AZ31B magnesium alloy |
| title_short | Surface chemistry, film morphology, local electrochemical behavior and cytotoxic response of anodized AZ31B magnesium alloy |
| title_sort | surface chemistry film morphology local electrochemical behavior and cytotoxic response of anodized az31b magnesium alloy |
| topic | AZ31B magnesium alloy Anodizing pretreatment Corrosion resistance Cytotoxicity SECM SKP |
| url | http://www.sciencedirect.com/science/article/pii/S2238785420319220 |
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