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Zairyo-to-Kankyo Vol. 69 (2020), No. 9

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

Backnumber

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Zairyo-to-Kankyo Vol. 69 (2020), No. 9

Effects of Adsorbed Species on Shape Change in Ultrafine Cu Plating and Etching

Kunitsugu Aramaki

pp. 234-236

DOI:

10.3323/jcorr.69.234

Abstract

Shape changes of ultrafine metallic structures were observed in Cu-plating and etching processes under the influence of adsorbed species acting as inhibitors and accelerators. The curvature enhanced accelerator coverage mechanism is important to explain Cu plating of narrow and deep trenches in the Damascene process. Effects of inhibitors on shape changes in Cu etching are discussed using the mechanism.

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Pitting Corrosion Resistance of Ta-Bearing Duplex Stainless Steel

Makoto Kawamori, Junichiro Kinugasa, Yuko Fukuta, Masaki Shimamoto, Tomoko Sugimura, Yutaro Katsuki, Natsuki Nishizawa, Mamoru Nagao

pp. 237-245

DOI:

10.3323/jcorr.69.237

Abstract

The effect of Ta addition on the pitting corrosion resistance of duplex stainless steels was investigated in both cases without and with deoxidization/desulfurization by addition of Al and Ca. The pitting corrosion resistance was improved by addition of Ta with two proposed mechanisms. For steels without Al and Ca, the MnS inclusions which act as initiation sites of the pitting corrosion are modified to the electrochemically-stable （Ta,Mn） oxysulfides. For steels with Al and Ca, the pitting initiation sites （CaS and （Al,Ca） oxides） are coated with the stable Ta-containing nitrides resulting in the suppression of pitting corrosion propagation.

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Effect of Seawater Components on Corrosion Rate of Steel in Air/solution Alternating Condition

Kyohei Otani, Takashi Tsukada, Fumiyoshi Ueno, Chiaki Kato

pp. 246-252

DOI:

10.3323/jcorr.69.246

Abstract

The purpose of this study was to investigate the effect of artificial seawater components on the corrosion rate of carbon steel under air/solution alternating condition, and to clarify the corrosion mechanism of carbon steel that changes with artificial seawater concentration. Mass measurements showed that the corrosion rate of carbon steel in the alternating condition accelerates with increasing concentration in the concentration region between deionized water to 200 times diluted artificial seawater（ASW）, and the corrosion rate decreases with increasing concentration in the concentration region between 20 times diluted ASW to undiluted ASW. It can be considered that the reason why the carbon steel corrosion was suppressed in highly concentrated artificial seawater would Mg ions and Ca ions in the artificial seawater precipitate and cover on the surface due to the increase in pH near the surface by oxygen reduction reaction.

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