Application of EIS to assess the effect of rare earths small addition on the corrosion behaviour of Zn–5% Al (Galfan) alloy in neutral aerated sodium chloride solution

Rosalbino, Francesco; Angelini, Emma Paola Maria Virginia; Macciò, D.; Saccone, A.; Delfino, S.

doi:10.1016/j.electacta.2008.08.063

Cited by 77 publications

(31 citation statements)

References 38 publications

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“…Similar high capacitances have previously been reported for zinc-aluminum-rare earth alloys. 31 Such high capacitances are typically associated with microporous surface structures and large surface areas. Micropores were observed on the alloy surfaces already after 1 h of exposure (Figure 8(b)).…”

Section: Discussionmentioning

confidence: 99%

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Zn-Mg and Zn-Ag Degradation Mechanism Under Biologically Relevant Conditions

Törne

Khan

Örnberg

et al. 2017

Surface Innovations

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Zinc (Zn) alloys form a promising new class of biodegradable metals that combine suitable mechanical properties with the favorable degradation properties of pure zinc. However, the current understanding of the influence of alloying elements on the corrosion of zinc alloys, in biologically relevant media, is limited. The authors studied the degradation of three alloys, zinc-4 wt% silver (Ag), zinc-0·5 wt% magnesium (Mg) and zinc-3 wt% magnesium by in situ electrochemical impedance spectroscopy (EIS). After exposure for 1 h or 30 d, the samples were characterized by infrared spectroscopy and scanning electron microscopy. The presence of secondary phases in the alloy microstructure induced selective corrosion and increased the degradation rate. EIS analysis revealed an increase in surface inhomogeneity already at short (hours) immersion times. The microgalvanic corrosion of the zinc-silver alloy resulted in enrichment of the AgZn 3 phase at the sample surface. The enrichment of silver and potential release of AgZn 3 particles may result in complications during the tissue regeneration. The zinc-magnesium alloy surface was depleted of the magnesium-rich phase after 8-12 d. The selective dissolution caused local precipitation of corrosion products and a thicker corrosion layer with larger pore size consistent with increased corrosion rate.

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Section: Discussionmentioning

confidence: 99%

“…The high-and low-frequency time constants have previously been ascribed to the charge transfer process and a diffusion process through a porous layer of corrosion product. 17,31 For most of the samples, the low-frequency time constant was absent at long Surface Innovations Volume 6 Issue SI1-2…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

Zn-Mg and Zn-Ag Degradation Mechanism Under Biologically Relevant Conditions

Törne

Khan

Örnberg

et al. 2017

Surface Innovations

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“…They also improve the alloy structure and its mechanical properties at room temperature and high temperature . It has been reported that the addition of rare earth elements (R) to Zn‐Al alloy influences its corrosion performance because of the formation of a film composed of R 2 O 3 and R(OH) 3 . In addition, the corrosion protection properties of rare earth elements are widely used in aluminum alloy and magnesium alloy .…”

Section: Introductionmentioning

confidence: 99%

Effects of lanthanum on the microstructure, electrochemical behavior, and anti‐corrosion properties of zinc–copper–titanium alloy in 3% sodium chloride solution

Song

et al. 2016

Materials & Corrosion

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SEM analysis shows that trace amounts of La in Zn-Cu-Ti alloy can eliminate dendritic segregation and produce uniform organization. Analyses of Tafel polarization curves and EIS show that La can obviously improve the corrosion resistance of Zn-Cu-Ti alloy by two features: (i) La oxide film has strong barrier properties; (ii) with an increase in La content, the thick skeletal dendrite e primary crystal phase disappears and the more refined and dispersed e II phase is generated, leading to a decrease in the active cathode area. Zn-Cu-Ti-0.5La alloy has the best corrosion resistance. The corrosion of the investigated alloys is mainly selective.

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“…8.7 ) (Rosalbino et al , 2009). 8.7 Corrosion current density, i corr , on Galfan doped with different RE additives after 168 hours exposure to 0.1 M NaCl solution at 25 °C (Rosalbino et al , 2009). Corrosion currents were obtained by converting the mass loss determined from the results of gravimetric determinations to corrosion current density using Faraday's law.…”

Section: Re-containing Metallic Coatingsmentioning

confidence: 99%

“…The presence of a surface layer containing elevated amounts of RE in the oxide/hydroxide form was observed using scanning electron microscopy and electron microprobe analysis (SEM-EMPA) methods. Moreover, the release of lanthanide ions during dissolution of the layers confers an inhibiting action on the cathodic corrosion process, thus providing additional active corrosion protection (Rosalbino et al , 2009).…”

Section: Re-containing Metallic Coatingsmentioning

confidence: 99%