Corrosion behavior of Mg wires for ureteral stent in artificial urine solution

• Published in: Corrosion science 2021-08, Vol.189, p.109567, Article 109567
• Main Authors: Mei, Di, Wang, Cheng, Nienaber, Maria, Pacheco, Margarida, Barros, Alexandre, Neves, Sara, Reis, Rui L., Zhu, Shijie, Bohlen, Jan, Letzig, Dietmar, Guan, Shaokang, Zheludkevich, Mikhail. L., Lamaka, Sviatlana V.
• Format: Article
• Language: English
• Subjects: Artificial urine solution; Biodegradability; Corrosion effects; Corrosion products; Corrosion rate; Corrosion tests; Hydrogen evolution; Hydrogen evolution test; Magnesium base alloys; Magnesium wires; Scavenging; Stratified structure; Ureteral stents
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2021.109567

[Display omitted] •Corrosion behavior of Mg wires in artificial urine solution is investigated.•The corrosion products with stratified structure are observed.•Artificial urine solution possesses a strong pH buffer effect.•Hydrogen evolution test cannot be used in this artificial urine solution. Ureteral stents are a relatively new potential application for biodegradable Mg alloys. In this study, the corrosion behavior of Mg-1Zn wires and pure Mg wires in artificial urine solution (AUS) is investigated. It is found that AUS possesses a strong pH buffer effect. Hydrogen evolution measurement cannot be used for Mg corrosion test in this AUS due to the oxygen scavenging effect of sulfite, which is a component of AUS. The corrosion products consist of two layers, MgNH4PO4·6H2O and Mg(OH)2. The partially protective MgNH4PO4·6H2O slows down the Mg corrosion, but it indicates the encrustation risk on bare Mg-based ureteral stents.