表面技術
Online ISSN : 1884-3409
Print ISSN : 0915-1869
67 巻 , 3 号
選択された号の論文の7件中1~7を表示しています
小特集/熱膨張率のマネジメント
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技術論文
  • 石見 清隆, 井田 義明, 津高 文幸, 杉本 克久
    2016 年 67 巻 3 号 p. 150-158
    発行日: 2016/03/01
    公開日: 2017/03/01
    ジャーナル フリー
    Anodic polarization curves of electro-polished Type 304 stainless steel were measured in organic acid solutions of eight types to develop a safe and environmentally friendly passivation treatment. The pitting potentials of the steel passivated in the solutions were examined in a deaerated 3.5%NaCl solution. Among the organic acid solutions, 8%DL-malic acid, 8%citric acid, 8%L-tartaric acid and 8%glucono-δ-lactone were found to be suitable as treatment solutions because of the low current densities(<0.02 A・m-2)of the passive state and high pitting potentials(>700 mV vs. Ag/AgCl(sat. KCl))of the passive films. Passive films formed on Type 304 stainless steel by natural immersion into 8%DL-malic acid+0.98%H2O2, 8%citric acid+0.98%H2O2, 8%L-tartaric acid+0.98%H2O2 and 8%glucono-δ-lactone+0.98%H2O2 showed high pitting potentials(>1000 mV)in NaCl solutions of 3.5% - saturation concentration. For solutions containing H2O2, the pitting-potentialraising effects were greater on an electro-polished surface than on a buffer(#400)-polished surface.
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