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

Jamali, S.H.; Moulton, Simon E.; Tallman, Dennis E.; Forsyth, Maria; Weber, Jan; Wallace, Gordon G.

doi:10.1016/j.electacta.2014.11.012

Cited by 50 publications

(42 citation statements)

References 25 publications

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“…In generation/collection (G/C) mode of SECM, electrochemically oxidisable or reducible species produced at the substrate can be sensed via an electrochemical reaction at the SECM probe. Applying an oxidative potential at the SECM, flux of H 2 evolution can be sensed and implemented to evaluate corrosion behaviour on Mg surface with a localized approach [13][14][15]. In comparison to other well-trusted corrosion measurement methods such as weight loss measurement and hydrogen collection [16,17], SECM presents the unique capability of studying spontaneous corrosion phenomena while cumulative methods such as weight loss and hydrogen collection can only affords corrosion rate data after a certain period of immersion.…”

Section: Introductionmentioning

confidence: 99%

“…In vitro studies of cytotoxicity of REs on primary human and mouse cells demonstrated highest relative cytotoxicity of La and Ce while good cell viability was achieved in presence of Eu, Nd and Pr [27]. A recently advanced [13,15] electrochemical approach using SECM was used to evaluate H 2 evolution as a measure of corrosion protection afforded by the surface treatment. Degradation of the Pr conversion layer on AZNd is also studied at a local scale using SECM in AC mode.…”

Section: Introductionmentioning

confidence: 99%

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Corrosion protection afforded by praseodymium conversion film on Mg alloy AZNd in simulated biological fluid studied by scanning electrochemical microscopy

Jamali

Moulton

Tallman

et al. 2015

Journal of Electroanalytical Chemistry

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Surface passivation of AZNd Mg alloy with Pr(NO 3 ) 3 is studied using scanning electrochemical microscopy (SECM) in surface generation/tip collection (SG/TC) and AC modes. Corrosion protection afforded by the Pr treatment and the degradation mechanism in a simulated biological environment was examined on a local scale and compared with non-treated AZNd. SG/TC mode results revealed a drastic decrease in H2 evolution due to the Pr treatment. Mapping the local insulating characteristics using AC-SECM showed higher conductivity of the surface where H 2 evolution was most favorable. Keywordsscanning, studied, fluid, biological, simulated, corrosion, microscopy, protection, electrochemical, afforded, praseodymium, conversion, film, mg, alloy, aznd Disciplines Engineering | Physical Sciences and Mathematics Publication DetailsJamali, S. S., Moulton, S. E., Tallman, D. E., Forsyth, M., Weber, J., Mirabedini, A. & Wallace, G. G. (2015). Corrosion protection afforded by praseodymium conversion film on Mg alloy AZNd in simulated biological fluid studied by scanning electrochemical microscopy. Journal of Electroanalytical Chemistry, 739 211-217. AuthorsSeyed S. Jamali, Simon E. Moulton, Dennis E. Tallman, Maria Forsyth, Jan Weber, Azadehsadat Mirabedini, and Gordon G. Wallace AbstractSurface passivation of AZNd Mg alloy with Pr(NO 3 ) 3 is studied using scanning electrochemical microscopy (SECM) in surface generation/tip collection (SG/TC) and AC modes. Corrosion protection afforded by the Pr treatment and the degradation mechanism in a simulated biological environment was examined on a local scale and compared with nontreated AZNd. SG/TC mode results revealed a drastic decrease in H 2 evolution due to the Pr treatment. Mapping the local insulating characteristics using AC-SECM showed higher conductivity of the surface where H 2 evolution was most favorable.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Corrosion protection afforded by praseodymium conversion film on Mg alloy AZNd in simulated biological fluid studied by scanning electrochemical microscopy

Jamali

Moulton

Tallman

et al. 2015

Journal of Electroanalytical Chemistry

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“…Samples were immersed in SBF solutions and H 2 evolution was studied using SECM in SG/TC mode. The immersion in the standard SBF represents a realistic in vitro environment with high level of corrosivity which yields an indirect measure of degradation rate by examining H 2 flux on a local scale . The diluted SBF was used to enable surface examination in a more moderate environment and allow for clearer differentiation between the protective properties.…”

Section: Resultsmentioning

confidence: 99%

Biodegradable Conducting Polymer Coating to Mitigate Early Stage Degradation of Magnesium in Simulated Biological Fluid: An Electrochemical Mechanistic Study

et al. 2019

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The application of a biodegradable conducting polymer coating based on a polythiophene composite (PTC) to mitigate degradation of magnesium in an in vitro environment is reported. The rationale behind the study is to advance a bioactive coating to control the rapid early stage degradation of the magnesium and prevent inflammatory reactions and physiological complications, while, in the long term, the coating degrades, followed by the full degradation of the magnesium implant. The conducting polymer in this study is deposited on a bioabsorbable medical grade magnesium alloy, AZNd, through layer‐by‐layer deposition, and the degradation behavior in simulated biological fluid is studied electrochemically. The possibility of a synergistic effect by combining praseodymium conversion coating together with the conducting polymer coating in protecting magnesium is also examined. Results show that the highest level of corrosion mitigation is afforded by the combination of praseodymium conversion and the conducting polymer coating layers. Electrochemical models are advanced to explain the electroactivity of the conducting polymer across the film as well as at the interface with electrolyte and substrate. Based on the physical and electrochemical evidence, the barrier effect is proposed as the main protection mechanism.

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“…[2,[13][14][15][16][17][18][19][20]. But a very few investigations are available in aqueous organic medium like ethylene glycol, which finds significance in automotive industries.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical corrosion study of Mg–Al–Zn–Mn alloy in aqueous ethylene glycol containing chloride ions

Medhashree

Shetty

2017

Journal of Materials Research and Technology

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

Cited by 50 publications

References 25 publications

Corrosion protection afforded by praseodymium conversion film on Mg alloy AZNd in simulated biological fluid studied by scanning electrochemical microscopy

Corrosion protection afforded by praseodymium conversion film on Mg alloy AZNd in simulated biological fluid studied by scanning electrochemical microscopy

Biodegradable Conducting Polymer Coating to Mitigate Early Stage Degradation of Magnesium in Simulated Biological Fluid: An Electrochemical Mechanistic Study

Electrochemical corrosion study of Mg–Al–Zn–Mn alloy in aqueous ethylene glycol containing chloride ions

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