Biodegradable Zn-1wt.%Mg(-0.5wt.%Mn) Alloys: Influence of Solidification Microstructure on Their Corrosion Behavior

Author(s)

Vida, Talita ; Cruz, Clarissa ; Barros, Andre ; Cheung, Noe ; Brito, Crystopher ; Garcia, Amauri

• Document type: Journal article
• Source: SURFACES; v. 6, n. 3, p. 13-pg., 2023-09-01.

Abstract

The development of biodegradable Zn-based alloys for implants that effectively mimic the functionality of native bone throughout the healing process is a multifaceted challenge; this is particularly evident in the task of achieving appropriate corrosion rates. This work explores the incorporation of 0.5wt.%Mn into a Zn-1wt.%Mg alloy, with focus on the relationship between corrosion behavior and microstructure. Electrochemical corrosion tests were carried out in a 0.06 M NaCl solution using as-solidified samples with two distinct microstructural length scales. Mn addition was found to induce significant electrochemical active behavior. Localized corrosion was predominant in interdendritic regions, with the ternary alloy exhibiting a higher susceptibility. For both alloys, the coarsening of the microstructure promoted a slight inclination to accelerate the corrosion rates in both biodegradable Zn alloys. The corrosion rate showed an increase of about nine-times with Mn addition for coarser eutectic spacings, while for finer ones, the increase was by about 22 times. (AU)

• FAPESP's process: 22/15696-0 - Evaluation of the tribocorrosion behavior of Zn-Mg-Cu and Zn-Mg-Sn alloys for biomaterials
• Grantee: Crystopher Cardoso de Brito
• Support Opportunities: Scholarships abroad - Research
• FAPESP's process: 21/11439-0 - Interrelationships between thermal parameters/solidification microstructures with wear resistance and hydrogen generation of Al-Sn-(Mg;Zn) alloys
• Grantee: Noe Cheung
• Support Opportunities: Regular Research Grants
• FAPESP's process: 14/50502-5 - Interrelation of thermal and microstructural solidification parameters and corrosion/tribocorrosion behavior of alloys for tribological, biomedical and solder applications
• Grantee: Amauri Garcia
• Support Opportunities: Regular Research Grants