Effect of pre-annealing temperature on electrochemical corrosion performance of the Au50Ag25Pd25 alloy in human artificial saliva

• Published in: European physical journal plus 2024-10, Vol.139 (10), p.953, Article 953
• Main Authors: Liaquat, Irfan, Khan, Abdul Munam, Ziya, Amer Bashir
• Format: Article
• Language: English
• Subjects: Alloys; Annealing; Applied and Technical Physics; Atomic; Biocompatibility; Complex Systems; Condensed Matter Physics; Corrosion; Corrosion currents; Corrosion effects; Corrosion potential; Corrosion resistance; Corrosion resistant alloys; Corrosion tests; Dental alloys; Dental materials; Dentistry; Electrochemical corrosion; Electrochemical impedance spectroscopy; Electrochemistry; Electrode polarization; Electrodes; Electrolytes; Gold; Inhomogeneity; Investigations; Mathematical and Computational Physics; Mechanical properties; Molecular; Morphology; Open circuit voltage; Optical and Plasma Physics; Oxide coatings; Palladium; Physics; Physics and Astronomy; Polarization; Regular Article; Silver; Silver base alloys; Software; Spectroscopy; Spectrum analysis; Temperature effects; Theoretical
• ISSN: 2190-5444; 2190-5444
• DOI: 10.1140/epjp/s13360-024-05757-0

Au–Ag–Pd alloys are extensively applied in dentistry due to their excellent mechanical properties, high corrosion resistance, and biocompatibility. This research carried out to determine the effect of pre-annealing on electrochemical corrosion by using electrochemical techniques such as open-circuit potential (OCP), electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization (PDP). The Au 50 Ag 25 Pd 25 alloy samples were annealed at 750 °C, 800 °C, and 900 °C. It was observed that as the pre-annealing temperature rises, the corrosion resistance steadily decreases because of the chemical inhomogeneity on the sample surfaces. Comparing the non-annealed sample (SN) to pre-annealed samples (S3, S5, and S7), potentiodynamic polarization parameters show that the SN has a higher polarization resistance and a lower corrosion current density. Imaging from scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) reveals that the sample surface forms oxide films that become thinner with increase in pre-annealing temperature. These results provide insight into the behavior of corrosion of Au–Ag–Pd alloys and can help optimize their performance in dental applications.