Zairyo-to-Kankyo

Commentary

JSCE in Rapidly Changing Era

Yoshinori Isomoto

2014 Volume 63 Issue 7 Pages 415-416
Published: July 15, 2014
Released on J-STAGE: January 16, 2015

DOIhttps://doi.org/10.3323/jcorr.63.415

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Review

Futher Considerations on Corrosion and Inhibition Phenomena of Anions Based on the Hard and Soft Acids and Bases Principle

Kunitsugu Aramaki

2014 Volume 63 Issue 7 Pages 417-426
Published: July 15, 2014
Released on J-STAGE: January 16, 2015

DOIhttps://doi.org/10.3323/jcorr.63.417

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A comprehensible explanation of the hard and soft acids and bases principle (HSAB principle) is described in this review first. Inhibition and stimulation of the anodic process for iron corrosion in an acid solution containing various anions are interpreted on the basis of the HSAB principle. Further, effects of anions on passive film breakdown of iron in solutions of various anions are discussed using the principle.

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Research Paper

Simulations of Intergranular Corrosion Feature for Stainless Steel using Cellular Automata Method

Takahiro Igarashi, Atsushi Komatsu, Takafumi Motooka, Fumiyoshi Ueno, ...

2014 Volume 63 Issue 7 Pages 431-437
Published: July 15, 2014
Released on J-STAGE: January 16, 2015

DOIhttps://doi.org/10.3323/jcorr.63.431

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In order to obtain the relation between an intergranular corrosion behavior and an impurities for stainless steel, cellular automata modeling and simulation of intergranular corrosion was carried out. From intergranular corrosion simulation considering non-uniform phosphorus component distribution on grain boundary, it suggested that complicated intergranular corrosion shape as in experimental data was caused by the large precipitation of phosphorus compounds in part of grain boundary.

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Prediction of Alternating Current Density and Cathodic Current Density Flowing into Holiday of Buried Coated Steel Pipe

Takao Kitagawa, Kenichi Haraga

2014 Volume 63 Issue 7 Pages 438-442
Published: July 15, 2014
Released on J-STAGE: January 16, 2015

DOIhttps://doi.org/10.3323/jcorr.63.438

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Cathodic protection is applied to prevent AC corrosion and soil corrosion, which are generated in holiday of buried coated steel pipe. However, there is no way to measure the current density flowing into holiday, cathodic protection is managed as an index to earth surface potential or the current density of a probe buried near the steel pipe. We developed new method for estimating the alternating current density by non-digging. Also we showed the effectiveness of the method through the verification experiment. The proposed method is expected to be applied for cathodic protection management of buried steel pipe.

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