Web四三酸化鉄皮膜(黒染め)とは. 四三酸化鉄皮膜とは四酸化三鉄のことをいい、酸素と鉄の比率が4:3になっている黒色の酸化皮膜です。 皮膜が化成された表面は、四酸化三鉄 … http://www9.plala.or.jp/s-bosei/sima/8eigyo-tetsu.html
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