Corrosion characteristics of heat-treated biomedical grade 316L stainless steel in simulated body fluids
Year: 2025
Type: article
Abstract: : This study investigates corrosion behavior of heat-treated biomedical grade 316L Stainless Steel (SS 316L) in simulated body fluids. The SS 316L widespread use in biomedical applications is due to its mechanical properties and biocompatibility. Yet, concerns about its susceptibility to corrosion in physiological environments persist. To address this, heat treatment was applied to enhance corrosion resistance by altering microstructure. Specimens underwent heat treatment at 1050-1200°C for 1 hour, followed by rapid water cooling. Corrosion behavior of untreated and treated samples was evaluated via electrochemical methods in 0.9% NaCl solutions, with the optimal sample further tested in enriched Hanks Balanced Salt Solution (HBSS+). Results revealed that specimen treated at 1200°C, then quenched (HT1200°C/1hr/WQ), deteriorated due to galvanic effects between γ-austenite and δ-ferrite phases. Conversely, specimen treated at 1100°C, then quenched (HT1100°C/1hr/WQ), showcased superior corrosion resistance even exceeding the untreated in 0.9% NaCl. Improved resistance is attributed to moderate, uniform grain size and full transformation to Austenitic phase during treatment. However, in aggressive HBSS+, 1100°C-treated specimen's resistance decreased, showing environment's impact despite microstructure enhancement. The study underscores intricate relationships between microstructure, treatment, and environment, providing valuable insights for optimizing SS 316L's performance in biomedical applications.
Source: Results in Materials
Language: English
Subfield: Metals and Alloys
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,530
Funder: University of Johannesburg
OpenAlex ID: W4407959366