Effect of γ-ray on the Corrosion of 347 Stainless Steel in 5% Sulfuric Acid

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  • ステンレス鋼の硫酸による腐食に及ぼすγ線の影響
  • ステンレス コウ ノ リュウサン ニ ヨル フショク ニ オヨボス ガンマセン ノ エイキョウ
  • Effect of γ-ray on the Corrosion of 347 Stainless Steel in 5% Sulfuric Acid

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Abstract

The corrosion rate of AISI 347 stainless steel in 5% sulfuric acid at 70∼97°C is divided into two regions, that is, the initial linear-rate law range (E\doteqdot20 kcal/mol) and the second one with the rate proportional to t0.5∼1.0. The irradiation of 60Co γ-ray affects only the 2nd region and increases the corrosion with the increase of the dose rate (10∼20% increase per 1×105 r/hr). The addition of hydrogen peroxide under no irradiation inhibits the corrosion. Therefore, the effect of the irradiation is believed to be caused by the reducing molecules which have a higher diffusion coefficient and a higher reactivity with the electrode than the oxidizing ones both of which are formed during the radiolysis of water. No change of the crystal structure was observed in the deposited film on the specimen with or without any irradiation.

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