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大阪府八尾市大竹西遺跡出土鉄剣の非破壊分析

Non-destructive analyses of iron sword excavated from Ohtake-nishi archaeological site in Osaka Prefecture

三ツ井 誠一郎  

Mitsui, Seiichiro

大阪府八尾市大竹西遺跡より出土した弥生時代の鉄剣の腐食状態を把握するため、X線CT分析による腐食層の厚さの測定、及びX線回折・蛍光X線(XRDF)分析による腐食生成物の同定と腐食層の組成分析を実施した。その結果、腐食層の平均的な厚さはほぼ全体に均一であった。また腐食生成物として菱鉄鉱(FeCO$$_{3}$$)及び針鉄鉱($$alpha$$-FeOOH)を確認した。

An ancient iron sword (ca 2,000 year old) was excavated from Ohtake-nishi archaeological site in Yao City, Osaka Prefecture. To understand corrosion state of the sword, we analysed thickness of corrosion layer with a X-ray CT and corrosion products with a portable XRD/XRF. As results, we found that the thickness of corrosion layer on the surface of the sword was generally uniform and identified siderite (FeCO$$_{3}$$) and goethite ($$alpha$$-FeOOH) as corrosion products.

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