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Zairyo-to-Kankyo Vol. 71 (2022), No. 10

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. 71 (2022), No. 10

As an Engineer Involved in the Field of Corrosion

Kiyomi Nose

pp. 273-274

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Article Title

As an Engineer Involved in the Field of Corrosion

Structure and Morphology of Zinc Rust Particles Prepared by Repeating Wet-Dry Cycles of Aqueous ZnCl2 Solutions

Hidekazu Tanaka, Sami Yamamoto, Tatsuo Ishikawa, Takenori Nakayama

pp. 279-283

Abstract

To simulate the atmospheric corrosion of galvanized steels in salinity environment, artificial zinc rust particles were prepared by repeating wet-dry cycle of aqueous ZnCl2 solutions in the presence of zinc rusts such as ZnO and Hydrozincite (Zn5(OH)6(CO32: HZ), and the transformation behavior of added ZnO and HZ into zinc hydroxychloride (Zn5(OH)8Cl2・H2O: ZHC) was examined. The procedure constitutes one cycle of wetting(20℃ and 4 h) and drying (85℃ and 20 h). After 1 cycle, almost all the added ZnO and HZ were transformed into ZHC and its transformation rate was in the order of ZnO>HZ. Increasing the wet-dry cycles enhanced the crystallization and particle growth of ZHC and turned the irregular-shaped ZHC particles into plate-like ZHC ones. These results allow us to infer that initial zinc rusts such as ZnO and HZ generated on the galvanized steels by atmospheric corrosion in salinity environment at initial corrosion stage are immediately transformed into plate-like ZHC rust particles, which form a dense protective rust layer on the steels to enhance the corrosion resistance.

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Article Title

Structure and Morphology of Zinc Rust Particles Prepared by Repeating Wet-Dry Cycles of Aqueous ZnCl2 Solutions

Effects of CO2 Partial Pressure and Drying Conditions on Carbonation of Mortars

Yuki Yokoyama, Kotaro Doi, Sachiko Hiromoto

pp. 284-287

Abstract

This study investigated the influence of the drying condition of the mortar specimens and the CO2 partial pressure during accelerated carbonation tests on the carbonation. The results show that when the change of the specimen’s mass due to drying was large and the CO2 partial pressure was high, the carbonation progress increased. Following the accelerated carbonation test, hyperbaric-oxygen accelerated corrosion tests were conducted. As a result, the steel embedded in the mortar specimens was corroded when the carbonation depth was almost the same as the mortar cover.

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Article Title

Effects of CO2 Partial Pressure and Drying Conditions on Carbonation of Mortars

Evaluation of Corrosion Resistance of Au Plated Titanium Bipolar Plates for PEM Water Electrolysis

Ayumu Minoura, Masanobu Kumagai, Takuji Ube, Hitoshi Yashiro, Masatsugu Murase

pp. 288-291

Abstract

Corrosion resistance and interfacial contact resistance (ICR) of titanium (Ti) bipolar plates for polymer electrolyte menbrane water electrolysis (PEMWE) with different Au plating thickness were evaluated by potentiostatic polarization in a sulfuric acid solution of pH 3.0. No dissolution of Ti was detected by the ICP-MS analysis (<1μg dm-3) when the Au plating thickness was 0.3μm or more. In the case of Ti with Au plating thickness of 0.1μm, Ti dissolved in the plating defects which were confirmed by ULV-SEM observation. The ICR increased after polarization test for Ti without plating, but not for Au plated Ti even with thickness of 0.1μm. These results indicate that microdefects in the plating layer can be starting points of dissolution of substrate, but do not immediately affect the increase in ICR as far as most of the surface remains covered.

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Article Title

Evaluation of Corrosion Resistance of Au Plated Titanium Bipolar Plates for PEM Water Electrolysis

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