Electrochemical testing of noble metal dental alloys: The influence of their chemical composition on the corrosion resistance

Grgur, Branimir N.; Lazić, Vesna; Stojić, Dragana; Rudolf, Rebeka

doi:10.1016/j.corsci.2021.109412

Cited by 13 publications

(6 citation statements)

References 41 publications

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“…The k values in a range of 10 4 to 10 5 M −1 s −1 refer to the surface catalytic rate. 62 As shown in 63 The results of electrolysis revealed that the electrochemically effective surface area was a critical factor that synergistically improved the faradaic efficiency on PtM alloy. Note that N 2 was the main product on Pt/G, while it converted to NO 3 − , namely, the highest oxidation state of nitrogen, on M/G.…”

Section: ■ Results and Discussionmentioning

confidence: 94%

“…Ni/G and Cu/G have a larger A ECSA, but the n values were lower ( n = 2–4) than those of Pt/G. The passivation effect might limit the activity of transition metals, particularly at a high current density, while the loading of Pt NPs enhanced the stability of the PtM/G electrode due to the corrosion-resistant property of platinum metal . The results of electrolysis revealed that the electrochemically effective surface area was a critical factor that synergistically improved the faradaic efficiency on PtM alloy.…”

Section: Resultsmentioning

confidence: 99%

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Electrocatalytic Ammonia Oxidation Mediated by Nickel and Copper Crystallites Decorated with Platinum Nanoparticle (PtM/G, M = Cu, Ni)

Rahardjo

Shih

2022

ACS Sustainable Chem. Eng.

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The nickel (Ni) and copper (Cu) oxides decorated with Pt nanoparticles (Pt NPs) were synthesized via electrodeposition for direct ammonia electro-oxidation. Voltammetry results revealed the reversible oxidation states of the transition metals as mediating the electron transfer of nitrogen species. Cu and Ni oxides showed catalytic ammonia oxidation at working potentials of +0.23 V and +1.1 V (vs Hg/HgO), respectively, and the peak current was significantly improved by Pt modification. In a constant current mode, the two-electrode electrolysis determined the efficiency of NH 3 conversion to NO 3 − and N 2 . At a current density of 1.5 mA cm −2 , the promising removal efficiency of NH 3 (>90%) on Cu and Ni oxides was attributed to the high electrochemically effective surface area (A ECSA ). The reaction mechanism of NH 3 oxidation and production of different nitrogen species were evaluated via a steady-state approach. The decoration of Pt NPs onto PtM/G and a low applied current favored ammonia conversion more to nitrogen gas than the monometal electrode did. Pt sites enhanced the dehydrogenation of NH 3 , thus moderately increasing the N 2 selectivity up to 60% on the PtCu/G electrode for an initial NH 3 of 50 mg-N L −1 .

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Section: ■ Results and Discussionmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Electrocatalytic Ammonia Oxidation Mediated by Nickel and Copper Crystallites Decorated with Platinum Nanoparticle (PtM/G, M = Cu, Ni)

Rahardjo

Shih

2022

ACS Sustainable Chem. Eng.

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“…The similar corrosion resistance of palladium-silver alloys and high-palladium alloys is attributed to the composition of their alloys [9]. Although the palladium content of PA alloys is only approximately 50 wt%, they still have a similar corrosion resistance under different pH values.…”

Section: Discussionmentioning

confidence: 92%

Corrosion Behavior of Dental Alloys Under Artificial Saliva Solution with Different pH Values

et al. 2022

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The purpose of this study was to investigate the corrosion behavior of four different dental casting alloys in artificial saliva solutions with varying pH values. Microstructures were observed using scanning electron microscopy. The corrosion behavior of the experimental alloys in artificial saliva was examined using potentiodynamic polarization measurements. The high noble alloy (Au-8.5Pt-2.6Pd-1.4In) exhibited better corrosion resistance with lower anodic current densities in the pH range of 3–5. The anodic current density of the noble alloy (Au-24.9Pd-19.0Ag-5.5In) decreased as the pH decreased. The noble (Pd-37.7Ag-8.5Sn) and base metal (Ni-25Cr-11.5Mo-1.4Si) alloys exhibited lower corrosion resistance with a relatively high current density at pH 3. Compared with noble alloys, base metal alloys exhibited good corrosion resistance in this study. This makes them a promising material for dental castings considering the complex pH changes in the oral environment.

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“…The metal composition and passivating film thickness all have substantial effects on the corrosion resistance of a metal or a passivating alloy. 37 If the chemical components of the materials are similar, the thickness of passivating film is the key factor that governs the corrosion resistance. Therefore, for AISI 304 and AISI 316, it is necessary to discuss and study the passivating film thickness.…”

Section: Resultsmentioning

confidence: 99%

Chloride corrosion behavior on heating pipeline made by AISI 304 and 316 in reclaimed water

et al. 2021

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Electrochemical testing of noble metal dental alloys: The influence of their chemical composition on the corrosion resistance

Cited by 13 publications

References 41 publications

Electrocatalytic Ammonia Oxidation Mediated by Nickel and Copper Crystallites Decorated with Platinum Nanoparticle (PtM/G, M = Cu, Ni)

Electrocatalytic Ammonia Oxidation Mediated by Nickel and Copper Crystallites Decorated with Platinum Nanoparticle (PtM/G, M = Cu, Ni)

Corrosion Behavior of Dental Alloys Under Artificial Saliva Solution with Different pH Values

Chloride corrosion behavior on heating pipeline made by AISI 304 and 316 in reclaimed water

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