Friction type rock bolt is one of the most commonly used rock reinforcement material for underground support since late 1970’s due to its ability to sustain large rock mass displacements. It is a slotted steel tube with one end tapered for easy insertion into a drill hole and the other end has a welded ring flange to hold the bearing plate. Because of its unique properties these kinds of rock bolts is being studied as a means to support the Yucca Mountain Repository tunnels. In this study potentiodynamic polarization tests were carried to study the corrosion behavior of this rock bolt in Simulated Yucca Mountain (YM) water as a function of temperature under deaertaed condition. The calculated corrosion rate shows an increase in corrosion rate as a function of temperature and concentration of the electrolyte. The corrosion rate increased from 93µm/yr at 25°C to 211 µm/yr at 90°C. Optical micrograph taken after the potetiodynamic scan showed general as well as pitting corrosion and the pit density increased significantly at 90°C. In this paper we also present the results from potentiostatic scans at different applied potential and at different temperatures in 1X YM water.