Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : October 07, 2017 - October 09, 2017
Magnesium has high ionization tendency and low corrosion resistance. The low corrosion resistance of magnesium is considered to be usable as a bioabsorbable material. This is because magnesium is easily corrodes even in the living body and the fourth most abundant element among the metal elements existing in the living body. However, the remaining period the biological material needs in the body due to the injury condition of the patient is different. The applied stress varies depending on the installation part .In order to satisfy the use conditions for each patient, it is important to grasp the mechanical anisotropy and the corrosion behavior of magnesium. To investigate the corrosion behavior of magnesium, the polarization test and the corroded surface observation were conducted. Test specimens were prepared with three different directions on the corroded surfaces. The corrosion potential is the potential Voltage when the current value is 0 A. When the potential Voltage is low, the corrosion rate is high. However, there is no different to the corrosion potential of each specimen. The corroded surfaces were observed at -1.35 V which is the anode region. At the beginning of the experiment, a film was formed on each specimens. With the lapse of time, a film ionized from the specimen was confirmed. Corrosion points of each specimen is larger in the order of the L-T specimen, the L-S specimen and the S-T specimen. It was found that the ionization rate of the film was different for each specimen.Therefore, it was found that the corrosion rate was higher in the order of the L-T specimen, the L-S specimen and the S-T specimen. From this experiment it was found that the corrosion rate of the anode region is different for each specimen.
