Fundamental Study of Corrosion Control in Marine and Offshore Structures Using Radiation Induced Surface Activation (RISA)

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Other Title
  • 放射線誘起表面活性 (RISA) を用いた船舶・海洋構造物の耐食材防食技術に関する基礎研究
  • ホウシャセン ユウキ ヒョウメン カッセイ RISA オ モチイタ センパク カイヨウ コウゾウブツ ノ タイショクザイ ボウショク ギジュツ ニ カンスル キソ ケンキュウ カイスイチュウ ニ オケル SUS304 ステンレスコウ ノ タイスキマ フショクセイ ノ コウジョウ
  • -Improvement of SUS304 Stainless Steel Durability Against Crevice Corrosion in Seawater
  • -海水中におけるSUS304ステンレス鋼の耐すきま腐食性の向上

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Description

A corrosion mitigation technique based on radiation induced surface activation (RISA) from the gamma ray irradiation on a metal surface is reported in this paper. This study aimed to develop a RISA method to prevent crevice corrosion in SUS304 stainless steel using low-intensity radioactive material. Experiment showed that an electrode potential of -100 mV vs. Ag/AgCl was produced and maintained on TiO2-coated SUS304 stainless steel specimens immersed in artificial seawater and in close contact with a small, sealed60Co source or activated by spontaneous neutron irradiation, with no corrosion observed for more than 7 days. On the contrary, the potential of the specimen without a radiation source decreased less than-280 mV vs. Ag/AgCl and crevice corrosion occurred beneath the O-ring within few days. The RISA effect of low-intensity radioactive material has the potential to prevent crevice corrosion of SUS304 stainless steel in actual seawater.

Journal

  • Marine Engineering

    Marine Engineering 42 (4), 675-681, 2007

    The Japan Institute of Marine Engineering

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