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Zairyo-to-Kankyo
Vol. 59 (2010), No. 6

Zairyo-to-Kankyo Vol. 59 (2010), No. 6

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. 59 (2010), No. 6

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Tadashi Shinohara

pp. 211-211

DOI:

10.3323/jcorr.59.211

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Bibtex

Ris

Advances in the Study of Passive Films on Stainless Steels: from Real to Artificial Passive Films and Now from Artificial to Real Passive Films

Nobuyoshi Hara

pp. 212-218

DOI:

10.3323/jcorr.59.212

Abstract

Studies of passive films on stainless steels are reviewed from the viewpoint of developing new resources-saved stainless steels (green stainless steels). Starting from the overview of the results of in-situ analyses for the thickness and chemical composition of real passive films, there are describing some important findings obtained from the model experiments using artificial passive films and ion-beam-sputter deposited Fe-Cr thin films, which simulate real passive films and ideal stainless steels, respectively. Finally, recent studies on the pit initiation mechanism at sulfide inclusions and on the improvement of pitting resistance by removal of the inclusions from steel surface are introduced to demonstrate a possibility of developing green stainless steels.

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Advances in the Study of Passive Films on Stainless Steels: from Real to Artificial Passive Films and Now from Artificial to Real Passive Films

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Effect of Ta Addition on Crevice Corrosion Resistance for Ni Based Corrosion Resistant Alloys

Hirokazu Sakai, Katsuo Sugahara, Hitoshi Saito

pp. 222-227

DOI:

10.3323/jcorr.59.222

Abstract

The effects of small amount of tantalum addition to a Ni-Cr-Mo alloy on crevice corrosion resistance in 25% NaCl at 107°C was investigated quantitatively by measuring the repassivation potentials for corrosion crevice (E_R,CREV). Upon the results, tantalum was revealed to shift the repassivation potentials to the noble direction and the effect was much more than the chromium or molybdenum. For the tantalum free alloys, the crevice corrosion resistance was found to correlate closely with the Pitting Resistance Evaluivalent number (PRE=[%Cr]+3.3([%Mo]+0.5[%W])), however, the tantalum containing alloys were against the correlation. Consequently, PRE(Ta)(=[%Cr]+3.3([%Mo]+0.5[%W])+7.7[%Ta]) was induced by adding a term of [%Ta] to the PRE equation. With this PRE(Ta), the crevice corrosion resistance for the tantalum containing alloys can be estimated.

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Effect of Ta Addition on Crevice Corrosion Resistance for Ni Based Corrosion Resistant Alloys

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Improvement of Weathering Resistance for Developed Thermoplastic Polyester Powder Coating for Telecommunication Plant

Yukitoshi Takeshita, Takao Handa, Tamotsu Kudo

pp. 228-231

DOI:

10.3323/jcorr.59.228

Abstract

Corrosion is one of the most important problems, particularly in relation to outdoor telecommunication equipment. Some corrosion prevention techniques such as crevice corrosion prevention for stainless steel and protective coatings on galvanized steel have been developed. As regards the latter, we have already developed a duplex protection system that employs resin coating and a galvanizing technique. There has been a need for weathering resistance technology that can protect telecommunications plant materials against damage during long-term use. In this work we have tried to improve the performance under various weathering conditions, in particular under ultraviolet (UV) light, which can easily damage polymer materials. Some powder paints designed to protect against UV light were prepared, and their performances were evaluated both with accelerated UV testing (e.g. with a xenon arc device) and when subjected to natural sunlight outdoor exposure in Okinawa, which has the most severe UV light conditions in Japan. We found that the UV absorber clearly improved the resistance to UV weathering. In addition, we tested for corrosion resistance under severely corrosive conditions outdoors at a coastal location on Miyakejima Island, and found that no blistering, cracking or corrosion occurred at current exposure time.

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Improvement of Weathering Resistance for Developed Thermoplastic Polyester Powder Coating for Telecommunication Plant

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Zairyo-to-Kankyo Vol. 59 (2010), No. 6

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. 59 (2010), No. 6

Actions to Activate JSCE

Share it with SNS

Advances in the Study of Passive Films on Stainless Steels: from Real to Artificial Passive Films and Now from Artificial to Real Passive Films

Share it with SNS

Effect of Ta Addition on Crevice Corrosion Resistance for Ni Based Corrosion Resistant Alloys

Share it with SNS

Improvement of Weathering Resistance for Developed Thermoplastic Polyester Powder Coating for Telecommunication Plant

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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