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東濃鉱山における工学材料長期浸漬試験 -金属材料編-

Long-term immersion tests of engineered materials in the Tono mine; Results for metals

濱 克宏; 谷口 直樹; 本田 明

not registered; Taniguchi, Naoki; not registered

地下水中に金属材料が存在する場合の,地質環境への影響と金属材料の耐久性を評価する目的で,東濃鉱山坑内の花崗岩岩盤中において,非加熱条件での10年間の浸漬試験を実施した。平板状(30$$times$$30$$times$$2tmm)の金属試験片(軟鋼および工業用純チタン)を有孔の容器に入れ地下水に浸漬させた。本報告書では,金属材料の耐久性を調査するために,所定の期間後に回収した試験片の外観観察,軟鋼試験片についてはその重量変化の測定,各種方法による腐食形態および腐食生成物の観察・分析の結果を示す。主な結果は以下のとおりである。(1)軟鋼試験片の重量減少量から,10年間の平均腐食速度は4.36$$times$$10-3mm/yと求められた。(2)軟鋼試験片の腐食生成物は,緻密な皮膜状の物質の上に,多孔質な物質が堆積している形態であった。皮膜状の物質はマグネタイト等の2価の鉄を含む鉄酸化物,多孔質な物質はゲーサイトなどの3価の鉄を含む鉄酸化物でそれぞれ構成されることが分かった。(3)チタン試験片は試験開始時の研磨痕が保持されており,局部腐食等の発生は観察されなかった。

The burial tests of mild steel and pure titanium were performed in a gallery at Tono mine to assess the corrosion resistance of these materials under goundwater environment. Specimens were placed in the container and immersed into groundwater. After the immersion period, the apperance of the surface of these specimens were observed. The corrosion product of mild steel specimen was analysed by various methods. The average corrosion rate of mild steel for 10 years was assessed by the measurement of the weight loss of carbon steel specimen. The results of the test were summerised as follows : (1)The average corrosion rate of mild steel for 10 years was assessed to be 4.36 $$times$$10$$^{-3}$$mm/y by the weight loss of the specimen. (2)The corrosion product consists of outer porous substance and inner tight corrosion product film. The former contains ferric oxide such as goethite and the latter contains ferrous oxide such as magnetite. (3)The evidence of the initiation of localised corrosion was not observed on the titanium specimens.

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