PRODUCTION OF HYDROGEN ABSORPTION-CONTROLLED TI OR TI-BASE ALLOY

摘要

PURPOSE:To obtain a Ti-base metal improved in hydrogen embrittlement as the defect of Ti while holding excellent corrosion resistance by implanting N ions in the surface of a member made of Ti or Ti alloy into specific concentration and also forming a hydrogen diffusion-preventing layer of high N content by means of temp. control. CONSTITUTION:In order to improve hydrogen embrittlement as the defect of a member composed of Ti or Ti-base alloy being lightweight and having high strength and high corrosion resistance, an N element is ionized and the resulting N ions are implanted in the surface of the above member at high energy. At this time, the amount of N ion implantation is regulated to =5X1016 ion/cm2 and also the temp. of the Ti-base metal member at the time of ion implantation is controlled to =100 deg.C, preferably to =250 deg.C, by which the effect of inhibiting hydrogen absorption can be improved and a hydrogen diffusion-preventing layer increased in N content can be formed in the surface layer part of the Ti-base metal and, as a result, hydrogen embrittlement as the defect of the Ti-base metal can be improved.