高張力ボルト中への侵入水素定量方法の開発(機器分析)(<特集>分析評価・解析)

概要

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It is well known that the delayed fracture of high-strength bolts is caused by trace amount of hydrogen absorbed in the operating environment of bolts. In order to establish the method for determination of this hydrogen, the hollow bolt collecting the permeating hydrogen gas has been developed. The detection system of hydrogen gas has been also developed by using SnO_2 semiconductor gas sensor. The lower limit of determination for hydrogen is 1 vol ppm in this system. The developed hollow bolts were dipped in HCl solution, or were exposed in the environment of high temperature and high humidity. The hydrogen content was found to change with the condition of the environment. The hydrogen content was increased with the stress loaded on the bolts. The developed system can be used for the determination of hydrogen absorbed into the bolts in the practical environment.
社団法人日本鉄鋼協会の論文
1991-11-01