The field of biomaterials has developed over several decades and continues to evolve as medical needs and technological capabilities advance. Biomaterial science focuses on materials designed or modified for interaction with biological systems, most often as part of medical devices or implants rather than as standalone materials. For successful implantation, these materials must exhibit excellent biocompatibility, mechanical stability, and strong interfacial bonding with surrounding tissues and fluids. Stainless steel 316L has long been regarded as a reliable implant material; however, continuous progress in materials engineering has driven the search for alternatives with superior performance. This study examines the corrosion behaviour of polyether ether ketone (PEEK), a high-performance polymer considered a promising candidate for biomedical applications. Corrosion resistance remains a critical factor, as it influences implant longevity, safety, and patient outcomes. Traditional corrosion-inhibiting methods often rely on organic or inorganic compounds that may pose environmental or biological risks. Biomaterials such as PEEK offer a safer and more sustainable solution due to their chemical stability and minimal toxicity. The findings of this investigation indicate that PEEK demonstrates significantly higher resistance to corrosive environments compared to commonly used metallic implant materials. Its enhanced corrosion tolerance highlights its potential as a durable and biocompatible alternative for next-generation biomedical implants.