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Effectiveness of Sodium Silicate on the Corrosion Protection of AA7075-T6 Aluminium Alloy in Sodium Chloride Solution

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Materials Sciences and Applications 2024年第4期15卷 53-65页

作者： francesco rosalbino Giorgio Scavino Graziano Ubertalli Dipartimento di Scienza Applicata e Tecnologia (DISAT) Politecnico di Torino Torino Italy

The influence of sodium silicate on the corrosion behaviour of aluminium alloy 7075-T6 in 0.1 M sodium chloride solution was studied by open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS) techniques. Scanning electron microscopy (SEM) was used to characterize the AA7075-T6 surface. Silicate can significantly reduce corrosion deterioration and the inhibition efficiency increases with the concentration of Na2SiO3. The corrosion inhibition mechanism involves the formation of a protective film over the alloy surface by adsorption of aluminosilicate anions from solution, as has also been suggested by others in literature.

关键词： Aluminium Alloy 7075-T6 Silicate Sodium Chloride Electrochemical Impedance Spectroscopy (EIS) Scanning Electron Microscopy (SEM)

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Corrosion Behaviour of Zr-Ag Alloys for Dental Implant Application

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Materials Sciences and Applications 2023年第11期14卷 501-514页

作者： francesco rosalbino Daniele Macciò Giorgio Scavino Dipartimento di Scienza dei Materiali e Ingegneria Chimica (DICHI) Politecnico di Torino Torino Italy Dipartimento di Chimica e Chimica Industriale (DCCI) Università Degli Studi di Genova Genova Italy

The electrochemical corrosion behaviour of three Zr-Ag alloys (Zr-1Ag, Zr-3Ag and Zr-5Ag) was investigated. Open circuit potential, linear potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques were employed in aerated artificial saliva (pH = 4.0) at 37°C. Silver alloying additions are found to be effective in enhancing the corrosion resistance of zirconium in artificial saliva environment. In fact, Zr-Ag alloys exhibit higher open circuit potentials, larger breakdown potentials and higher impedance values as compared to cp Zr. This behaviour can be ascribed to the formation of a thicker and more stable passive film with increasing compactness, able to provide better protection against the corrosion attack.

关键词： Zr-Ag Alloys Corrosion Resistance Open Circuit Potential Potentiodynamic Polarization Curves Electrochemical Impedance Spectroscopy (EIS)

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