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Zairyo-to-Kankyo Vol. 73 (2024), No. 7

ISIJ International
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ONLINE ISSN: 1881-9664
PRINT ISSN: 0917-0480
Publisher: Japan Society of Corrosion Engineering

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Zairyo-to-Kankyo Vol. 73 (2024), No. 7

Mechanism of Grooving Corrosion Resistance in Cu, Ti Added High Frequency Electric Resistance Welded Steel Pipes

Takuya Hara, Atsushi Sato, Kazushi Nakamura, Ryuji Uemori

pp. 168-174

Abstract

In order to elucidate the grooving corrosion suppression mechanism of Cu and Ti added ERW steel pipes, welded portions were immersed in salt water after polishing without using the SPEED method, which electrolytically polishes the specimen using a non-aqueous electrolyte. Sulfides were observed using FIB processing. Before immersion, MnS and Ti4C2S2 were observed. After immersion, Cu7.2S4 precipitated on the MnS on the immersed surface. Furthermore, Ti4C2S2 did not dissolve. Addition of Ti produced insoluble Ti4C2S2, which reduced the number density of MnS, and addition of Cu precipitated insoluble Cu7.2S4 on MnS, suppressing the dissolution of MnS.

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Article Title

Mechanism of Grooving Corrosion Resistance in Cu, Ti Added High Frequency Electric Resistance Welded Steel Pipes

ToF-SIMS Analysis of MEA Contaminated by Corrosion of Stainless Steel Bipolar Plate in PEFC Operation

Ayumu Minoura, Masanobu Kumagai, Saki Kazawa, Runa Shirasawa, Hayato Sasaki, Hitoshi Yashiro, Masatsugu Murase

pp. 175-180

Abstract

It has been pointed out that when stainless steel bipolar plates are used in PEFC, metal ions eluted due to corrosion contaminate the MEA and degrade cell performance. However, it was not clear whether the contamination mainly occurs from the anode side or the cathode side. In this study, a single cell was operated using bare type 304 stainless steel bipolar plates in contact with MEA and the cross sectional distribution of iron, chromium and nickel in the MEA was analyzed by ToF-SIMS. The results showed that iron, chromium and nickel were enriched in the anode side GDL and CCM. These results indicated that the leaching of metal ions from the anode side stainless steel bipolar plate was the main cause of MEA contamination.

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Article Title

ToF-SIMS Analysis of MEA Contaminated by Corrosion of Stainless Steel Bipolar Plate in PEFC Operation

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