editor@tjprc.org SCOPUS Indexed Journal www.tjprc.org INVESTIGATION BIOMEDICAL CORROSION OF IMPLANT ALLOYS IN PHYSIOLOGICAL ENVIRONMENT NABAA S. RADHI 1 & ZAINAB AL-KHAFAJI 2 1 Lecturer of Materials College Engineering, University of Babylon, Hilla, Iraq 2 Information Technology Center, Al-Mustaqbal University College, Babylon, Iraq ABSTRACT A biomaterial could be any material, which is designed for medical application inside human body for medical purposes such as treat, augment, repair or replace a tissue function of the body. And, these materials became very common in the ten recent years, and Ni-Ti alloys is considered as one of the metals that is used for biomedical applications. For long period, the biomaterials are very limited materials and these materials are very expensive such as bioinert titanium based alloys, stainless steel, alumina and zirconia ceramics. This research study focuses on the corrosion properties of both samples (Titanium and Stainless steel) in different corrosive environments such as NaCl, H 2 SO 4 and NaF, and investigates the microstructure before and after corrosive environments. And then, measuring the surface roughness with and without corrosive environments. Finally, XRD for both titanium and stainless steel samples are tested. KEYWORDS: Biocompatible, Bioinert, Biomaterials, Biomedical, Implants & XRD Received: May 08, 2018; Accepted: May 29, 2018; Published: Jul 04, 2018; Paper Id.: IJMPERDAUG201827 INTRODUCTION Due to increase in the need of body replacement parts (hard tissue) that get damaged due to heath issues or accidents, various metal had been used in many body parts like hip joints and knee joints, also bone plates, bolts, spinal fixation devices that are used as fracture healing aids, as well as used in dental planting. And, the reasons of this wide application for the metals inside human body are excellent mechanical characteristics and the metal resistance against corrosion. In addition to pure metals, some metallic alloys also used to perform an active role in producing devices parts like vascular stents, the wire of guiding in catheter, arch-wires of orthodontic and cochlea planting. And, to consider planting of the part in vivo environment is successful, the part must be biocompatible with the vivo environment, because metallic implant can be corroded in this environment (Williams, 1982). The corrosion of the implants have bad consequences such as the disintegration of the planting material itself, and this problem will weaken or hurt the planting, in addition to that the corrosion products have a harmful effect on the surrounding tissues and organs. Stainless Steels The stainless steel type 18-8 (type 302 in modern classification) was the first stainless steel types that are used for planting in human body, and this type of stainless steel is stronger than vanadium steel as well as more corrosion resistant. On the other hand, the experiments show that vanadium steel is corroded severely in vivo environment, for this reason, it is no longer applied in plantings. The development of stainless steel led to Original Article International Journal of Mechanical and Production Engineering Research and Development (IJMPERD) ISSN(P): 2249-6890; ISSN(E): 2249-8001 Vol. 8, Issue 4, Aug 2018, 247-256 © TJPRC Pvt. Ltd.