Evaluating the corrosion behaviour of Magnesium alloy in simulated biological fluid by using SECM to detect hydrogen evolution

[Display omitted] Scanning electrochemical microscopy (SECM) in surface generation/tip collection mode is investigated as an assessment tool for studying the corrosion behaviour of magnesium in simulated biological fluid. The technique provides a local map of hydrogen (H2) evolution which alone can...

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Bibliographic Details
Published in:Electrochimica acta 2015-01, Vol.152, p.294-301
Main Authors: Jamali, Sina S., Moulton, Simon E., Tallman, Dennis E., Forsyth, Maria, Weber, Jan, Wallace, Gordon G.
Format: Article
Language:English
Subjects:
Biological
Corrosion
Corrosion tests
Evolution
Fluid flow
Fluids
Magnesium
Magnesium base alloys
Simulation
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Summary:[Display omitted] Scanning electrochemical microscopy (SECM) in surface generation/tip collection mode is investigated as an assessment tool for studying the corrosion behaviour of magnesium in simulated biological fluid. The technique provides a local map of hydrogen (H2) evolution which alone can be used as a direct measure of corrosion. The H2 generated during corrosion of magnesium is oxidized at the probe(i.e. a Pt ultra micro-electrode);with the magnitude of the current generated due to oxidation being indicative of the intensity of H2 evolution at a local scale on the magnesium surface. This method was calibrated using a cathodically polarized Pt disk to simulate H2 evolution in a controlled condition on a homogeneous surface. Potential interference from dissolving Mg or high local pH was also investigated. The technique was implemented for studying H2 evolution at the surface of AZ31 as a model Mg alloy.SECM results combined with SEM-EDX and profilometry data revealed that local domains of higher H2 evolution on the surface of AZ31 are in close proximityof the observed pitting sites.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2014.11.012