Biocorrosion is a significant challenge in biomedical materials engineering, resulting from electrochemical interactions between metals and biological fluids inside the human body. Medical implants, such as artificial joints and dental implants, are exposed to environments containing salts and proteins that may affect their surface stability. Stainless steel, titanium alloys, and cobalt-chromium alloys are widely used in biomedical applications. Corrosion may release metallic ions that can trigger inflammatory responses and affect implant biocompatibility. Protective coatings and surface modification techniques are therefore applied to improve corrosion resistance and extend implant service life. Understanding biocorrosion is essential for developing safer and more durable biomedical materials