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Zairyo-to-Kankyo
Vol. 62 (2013), No. 1

Zairyo-to-Kankyo Vol. 62 (2013), No. 1

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

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20 Jun. (Last 30 Days)

Zairyo-to-Kankyo Vol. 62 (2013), No. 1

Ceramics and Corrosion

Osamu Sakurada

pp. 1-2

DOI:

10.3323/jcorr.62.1

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Article Title

Ceramics and Corrosion

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Study of Protective Coating on Steel Wire Strands for Telecommunications in Coastal Areas

Mariko Nakamura

pp. 3-8

DOI:

10.3323/jcorr.62.3

Abstract

Communication lines are usually composed of steel and other metallic components and are built outdoors. To determine whether local corrosion is inhibited in coastal areas, which are tough on metals, we conducted a longterm (23 years) exposure test on Miyake Island. The test candidate was steel suspension wire used for suspending communication cables on telephone poles. For preventing corrosion such wires, Zn coating had been used. However, some steel wire strands located in coastal areas still corroded. This is because air born sea salt particles from the ocean are blown by the wind and adhere to the surface of metals. To protect steel wires against atmospheric corrosion, Al coating was applied because of its higher corrosion resistance compared with that of Zn coating. This coating still did not prevent corrosion at specific points in the coastal areas. We compared three types of steel wire strands, Zn coated and Al coated, which are currently used for protecting steel wires, and one Al coated with sacrificial anode tape was efficient in preventing on steel wires had efficacy as protecting corrosion by conducting the exposure test in Miyake Island for 23 years.

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Study of Protective Coating on Steel Wire Strands for Telecommunications in Coastal Areas

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Chemical State Analysis of Tin Oxide Films by Voltammetry using Ammonia Buffer as the Supporting Electrolyte

Shigeyoshi Nakayama, Takayasu Sugihara, Takenori Notoya, Toshiyuki Osakai

pp. 16-21

DOI:

10.3323/jcorr.62.16

Abstract

A new voltammetric method for determination of the oxides on tin was proposed. In an ammonia buffer solution (0.5 M NH₄OH+0.5 M NH₄Cl), well-defined reduction peaks for SnO and hydrated SnO₂(denoted as SnO₂･nH₂O) were observed in a current-potential curve. The peak potentials were fully separated by -0.3 V, since NH₄⁺ ions facilitated the reduction of SnO₂･nH₂O. On the other hand, in a borate buffer solution, which has been frequently used as the supporting electrolyte for this purpose, and in 1 M KCl containing higher concentration of ions, the peak of SnO₂･nH₂O was not detected. By using the ammonia buffer solution, we found that the main corrosion products formed on tin in air were SnO and SnO₂･nH₂O. It was also found that SnO was formed in air at a temperature higher than 100℃, while SnO₂･nH₂O was formed at a temperature below 100℃ with a higher relative humidity of 90%. The amounts of the respective oxides increased with temperature and relative humidity. In addition, the film thicknesses of tin oxides estimated from the areas of reduction peaks were close agreement with FIB/SEM data.

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Article Title

Chemical State Analysis of Tin Oxide Films by Voltammetry using Ammonia Buffer as the Supporting Electrolyte

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Zairyo-to-Kankyo Vol. 62 (2013), No. 1

Keyword Ranking

blast furnace

electoromagnetic

melt

mg treatment inclusion

ステンレス鋼 ti-ni

electoromagnetic segregation

magnethydrodynamics

technol. plast

thermo dynamics and kinetics of coal gasification in a liquid iron bath

岡本

Zairyo-to-Kankyo Vol. 62 (2013), No. 1

Ceramics and Corrosion

Share it with SNS

Study of Protective Coating on Steel Wire Strands for Telecommunications in Coastal Areas

Share it with SNS

Chemical State Analysis of Tin Oxide Films by Voltammetry using Ammonia Buffer as the Supporting Electrolyte

Share it with SNS

Article Access Ranking

Wettability of CaS Against Molten Iron at 1873 K

Perspectives on the Promising Pathways to Zero Carbon Emissions in the Steel Industry toward 2050

New Electromagnetic Flow Control System for Optimization of Molten Steel Flow in Continuous Casting Mold

Preface to the Special Issue on “Challenges to Comprehension for Phenomena of Degradation, Softening, and Melting of Raw Materials in Hydrogen-enriched Ironmaking Process”

Effect of Al in the coating layer of Zn-coated steel sheet on Zn oxidation during hot-stamping heating

Growth, Removal, and Agglomeration of Various Type of Oxide Inclusions in Molten Steel

Investigation of the Effects of Mechanical Properties and Carbon Content on Cold Cracking in Laser Welds of High-strength Thin Steel Sheets

Effect of Water on the Non-Isothermal Hydrogen-Water Reduction of Industrial Hematite Pellets

Low Temperature Reduction Disintegration Mechanism of Self-fluxing Pellet under High Hydrogen Condition of Blast Furnace at 500°C

Effects of alloying-element addition on hydrogen diffusion and hydrogen absorption in Ni

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