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Zairyo-to-Kankyo
Vol. 59 (2010), No. 3

Zairyo-to-Kankyo Vol. 59 (2010), No. 3

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

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08 Oct. (Last 30 Days)

Zairyo-to-Kankyo Vol. 59 (2010), No. 3

Future of ‘Corrosion and Materials Performance’

Jun'ichi Sakai

pp. 61-61

DOI:

10.3323/jcorr.59.61

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Article Title

Future of ‘Corrosion and Materials Performance’

Bibtex

Ris

Detection of Pinhole Defects in Plated Layers of Flexible Flat Cables by Anodic Polarization Method

Shigeyoshi Nakayama, Takayasu Sugihara, Akihisa Hosoe, Shinji Inazawa

pp. 70-74

DOI:

10.3323/jcorr.59.70

Abstract

Anodic polarization method was applied for the investigation of pinhole defects in a gold-plated or a nickel-plated layer of FFCs (Flexible Flat Cables). Pinhole defects in a gold-plated layer were quantitatively determined using 5 M H₂SO₄ as the electrolyte. The ratio of pinhole defects over 0.05% could be evaluated. Although pinhole defects in a gold-plated layer tend to decrease with an increase of the plating thickness, an excessive use of gold results in a cost problem. But generally, pinhole defects in a gold-plated layer are considered to decrease adequately, if the qualities of a base nickel-plated layer are high enough. The method of measuring pinhole defects in a nickel-plated layer was also developed for the quality estimation. In the case with acidic electrolytes, the anodic dissolution of nickel started before that of copper. However, the use of an alkaline electrolyte (i.e., 7 M KOH) enabled us to detect the current peak due to the formation of a copper oxide without the interference of the anodic reaction of a nickel-plated layer. The evaluation lower limit of the ratio of nickel pinhole defects was around 0.01%.

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Article Title

Detection of Pinhole Defects in Plated Layers of Flexible Flat Cables by Anodic Polarization Method

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Nondestructive Evaluation of Concrete Environment against Corrosion of Reinforcing Bar Using the Magnetic Corrosion Probe

Hitoshi Yashiro, Seung-Taek Myung, Eiichi Suzuki, Tetsuya Oyamada, Tadashi Fujiwara

pp. 75-79

DOI:

10.3323/jcorr.59.75

Abstract

The goal of this paper is to evaluate the environment within concrete nondestructively related to corrosion of reinforcing bar using the newly developed magnetic corrosion probe which is introduced into concrete to raise a magnetic signal. The probe was prepared by electroplating of iron onto a copper bar, which was subsequently heat treated at 423 K for 30 min to stabilize the residual magnetization. The residual magnetization from the probe, as detected by superconducting interference device (SQUID) decreased with progress of corrosion of the probe. The electrochemical behavior of the magnetic corrosion probe was also evaluated in a saturated Ca(OH)₂ solution. The as plated probe showed a large active current density and residual magnetization. The heat treatment of the probe resulted in reduction of the active current density and residual magnetization. Meanwhile the passive current density of the probe was still higher as compared with that of an iron bar even after the heat treatment. This means that the probe is more sensitive to corrosive environment than reinforcing bars. Thus, the developed probe is expected to give a magnetic warning against degradation of surroundings in advance of the corrosion of reinforcing bar.

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Article Title

Nondestructive Evaluation of Concrete Environment against Corrosion of Reinforcing Bar Using the Magnetic Corrosion Probe

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Zairyo-to-Kankyo Vol. 59 (2010), No. 3

Keyword Ranking

impact delta ferrite

hrx19

analysis of generation mechanism of unimodal and bimodal waveform detection signals of a whole roll flatness meter

austenite ferrite grain curvature

calcium carbonate

current trends on deep learning techniques applied in iron and steel making field: a review

fracture toughness grain size

grain curvature

mold flux

oxide vapour high temperature

Zairyo-to-Kankyo Vol. 59 (2010), No. 3

Future of ‘Corrosion and Materials Performance’

Share it with SNS

Detection of Pinhole Defects in Plated Layers of Flexible Flat Cables by Anodic Polarization Method

Share it with SNS

Nondestructive Evaluation of Concrete Environment against Corrosion of Reinforcing Bar Using the Magnetic Corrosion Probe

Share it with SNS

Article Access Ranking

Current Trends on Deep Learning Techniques Applied in Iron and Steel Making Field: A Review

Phonon mean free path of silicate glasses: a useful parameter to distinguish between framework and nonframework cations

Effect of Wettability on Droplet Agglomeration in Two Immiscible Liquids

Arc-plasma-assisted laser-induced breakdown spectroscopy (AP-LIBS): A Study on Signal Enhancement and Spatiotemporal Distribution

Effect of microalloying of V, Nb and Mo on hydrogen embrittlement susceptibility of 2 GPa-grade medium-carbon Si–Cr spring steel with tempered martensite microstructure

Ductility loss of a metastable austenitic stainless steel and its TIG weldment due to hydrogen embrittlement at low temperatures considering the effect of pre-strain at 4K

Effect of Binder Adsorption Characteristics of Coal on Cold Strength for Ferro-coke Briquette

Cost of Corrosion in Japan

Cost of Corrosion in Japan

Study of Optimum Silicon Content between Iron-making and Steel-making Process on the Hot Metal Pretreatment

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