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Journal Articles

Experimental and modeling study on ion concentration behavior in metal crevices in high-purity water

Soma, Yasutaka; Komatsu, Atsushi; Igarashi, Takahiro

Dai-71-Kai Zairyo To Kankyo Toronkai Koenshu (CD-ROM), p.253 - 256, 2024/11

In our previous study, we reported that Cl ions penetrating stainless steel crevices do not dissipate by diffusion, even in high-purity water (i.e., conductivity remains stable), likely due to electrochemical reactions inside and outside the crevice. This study further analyzes ion behavior by experimentally and computationally investigating ion concentration drivers in high-purity water. Results show that, at 50$$^{circ}$$C, the crevice conductivity of SUS316L stainless steel reached 100 $$mu$$S/cm (100-1000 times bulk water). Modeling suggests this is due to metal cations and hydroxide ions from dissolved oxygen reduction. The dissolution rate was estimated at 10nA/cm$$^{2}$$.

Journal Articles

Localized corrosion in crevice of SUS316 stainless steel in oxygenated high temperature and high purity water

Soma, Yasutaka; Ueno, Fumiyoshi

Zairyo To Kankyo, 67(5), p.222 - 228, 2018/05

Localized corrosion in crevice of SUS316 stainless steel after immersion in 288$$^{circ}$$C high purity water with dissolved oxygen concentration of 32 ppm for 100 h was analyzed. Two different types of localized corrosion initiated on grain boundary and inclusions. The former initiated on grain boundary and oxide grown into grain matrix. The oxidized area showed duplex structure composed of microcrystalline FeCr$$_{2}$$O$$_{4}$$ and island-shaped residual metals. The latter initiated on inclusions containing Ca and S and microcrystalline FeCr$$_{2}$$O$$_{4}$$ grown into metal matrix. These localized corrosion occurred selectively in oxygen depleted area indicated formation of macroscopic corrosion cell with the corroded area as anode and surrounding oxygenated area as cathode.

Journal Articles

Analysis of high purity water for nuclear reactor

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Bunseki Kagaku, 13(10), P. 1056, 1964/00

no abstracts in English

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