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. 2018 Dec 28;4(1):71-78.
doi: 10.1016/j.bioactmat.2018.12.005. eCollection 2019 Mar.

In-vitro corrosion of AZ31 magnesium alloys by using a polydopamine coating

Anna Carangelo  1 , Annalisa Acquesta  1 , Tullio Monetta  1
Affiliations

In-vitro corrosion of AZ31 magnesium alloys by using a polydopamine coating

Anna Carangelo et al. Bioact Mater. .

Abstract

Magnesium alloys are candidates to be used as biodegradable biomaterials for producing medical device. Their use is restricted due to the high degradation rate in physiological media. To contribute to solving this problem, a polydopamine (PDOPA) layer could be used to increase adhesion between the metallic substrate and external organic coating. In this paper, the corrosion behaviour of samples was investigated to determine their performance during the long-term exposure in simulated body fluid. Electrochemical methods including Open Circuit Potential (OCP) and Electrochemical Impedance Spectroscopy (EIS) were used to investigate the corrosion resistance of samples. The results demonstrated a decreasing of the substrate degradation rate when PDOPA was used as interlayer supposing a synergistic effect when it was used together with the organic coating.

Keywords: Biodegradability; Corrosion resistance; Magnesium alloy; Polydopamine coating.

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Figures

Image 1
Graphical abstract
Fig. 1
Fig. 1
Comparison of EIS spectra of investigated samples at the beginning of the immersion period in Hank's solution.
Fig. 2
Fig. 2
Comparison of EIS spectra of investigated samples after 3 days of immersion in Hank's solution.
Fig. 3
Fig. 3
Comparison of EIS spectra of investigated samples after different treatments after 7 days of immersion in Hank's solution.
Fig. 4
Fig. 4
Comparison of EIS spectra of investigated samples after different treatments after 15 days of immersion in Hank's solution.
Fig. 5
Fig. 5
Time evolution of impedance modulus of all samples at the same frequency of 0.02 Hz.
Fig. 6
Fig. 6
Time evolution of corrosion potential of all samples during corrosion tests.
Fig. 7
Fig. 7
Scanning electron micrograph and EDS spectrum of the surface of AZ sample before immersion in Hank's solution.
Fig. 8
Fig. 8
Scanning electron micrograph and EDS spectrum of the surface of AZ sample at the end of corrosion test in Hank's solution.
Fig. 9
Fig. 9
Scanning electron micrograph and EDS spectrum of the surface of AZD sample before immersion in Hank's solution.
Fig. 10
Fig. 10
Scanning electron micrograph and EDS spectrum of the surface of AZD sample at the end of the corrosion test in Hank's solution.
Fig. 11
Fig. 11
Scanning electron micrograph and EDS spectrum of the surface of AZE sample before immersion in Hank's solution.
Fig. 12
Fig. 12
Scanning electron micrograph and EDS spectrum of the surface of AZDE sample before immersion in Hank's solution.
See this image and copyright information in PMC

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