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Zairyo-to-Kankyo Vol. 57 (2008), No. 9

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

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Zairyo-to-Kankyo Vol. 57 (2008), No. 9

Passive Films on Stainless Steels −Present State of Analysis and Understanding

Katsuhisa Sugimoto

pp. 375-384

DOI:

10.3323/jcorr.57.375

Abstract

Recent experimental results on the thickness, composition, conduction type, bandgap and impedance diagram of passive films on stainless steels were reviewed first. The change in conditions of passive films was shown as a function of potential. Then, the electrochemical nature of artificial passivation films that simulated the thickness and composition of passive films was introduced. The protective ability of passive films against chloride pitting was discussed in accordance with the electrochemical nature of artificial passivation films. Finally, some future subjects were proposed for the better understanding of passive films.

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Passive Films on Stainless Steels −Present State of Analysis and Understanding

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Influence of Anions on Corrosion Behavior of Zinc in Tap Water

Yasuki Matsukawa, Mamoru Miyashita, Shukuji Asakura

pp. 392-399

DOI:

10.3323/jcorr.57.392

Abstract

This study was conducted in order to clarify the corrosion behavior of galvanized steel pipes which have often been used for building facilities such cooling water systems. We observed corrosion rates, corrosion potentials, and corrosion products of zinc in tap water of Tsukuba city, distilled water and solutions of some salts at 40°C.
The effects of anions on the corrosion of zinc are summarized as follows. HCO3− inhibits the corrosive reaction. The inhibitive nature of HCO3− comes from the formation of Zn4CO3(OH)6·H2O which retards the anodic reaction. On the other hand, SO42−, Cl−, and NO3− promote the corrosion. The order of promotion is determined experimentally as SO42−>Cl−>NO3− in the concentration of various anion range (<1 mmol L−1) included in tap water. SO42− and Cl− promote the corrosion reaction by destructing the protective ability of surface films. NO3− activates the cathodic reaction, due to its oxidizing nature.
Distilled water was more corrosive than tap water of Tsukuba city. This is due to the salts in tap water, which form the protective films on zinc. The corrosivity of tap water could be discussed on the basis of present paper.

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Influence of Anions on Corrosion Behavior of Zinc in Tap Water

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Morphological Change of Fibroblast Cells on Titanium and Platinum Cultured at Anodic and Cathodic Potentials

Sachiko Hiromoto, Joerg Ziegler, Akiko Yamamoto

pp. 400-408

DOI:

10.3323/jcorr.57.400

Abstract

To understand cellular response against applied potential on different electrode materials, cell morphology and cell coverage of murine fibroblast L929 cultured on Ti and Pt electrodes were examined. Anodic and cathodic potentials were applied on Ti and Pt using a potentiostat. At the anodic potentials of 800 and 950 mV vs. Ag/AgCl, no cells kept a normal shape on both Ti and Pt. At the cathodic potential of −350 mV, the cells on Ti were normally extended ; whereas some of the cells on Pt were aggregated or round. At −1000 mV, the cells had spherical shape on Ti, while the Pt surface was covered by white precipitates with no cell remained. The change in cell morphology and the decrease in coverage at anodic potentials were significantly larger than those at the cathodic potentials. The morphological change of L929 on Ti was rather smaller than that on Pt at the same potentials, which is probably because the electric filed around the cells on Ti is smaller than that on Pt owing to the surface oxide film on Ti. These facts indicate that the cell response to the applied potential depends on the azimuth of electric field and electrode materials.

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Morphological Change of Fibroblast Cells on Titanium and Platinum Cultured at Anodic and Cathodic Potentials

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