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Zairyo-to-Kankyo
Vol. 61 (2012), No. 5

Zairyo-to-Kankyo Vol. 61 (2012), No. 5

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. 61 (2012), No. 5

Subject and Future on Development for Inhibitor

Sumio Akashi

pp. 201-

DOI:

10.3323/jcorr.61.201

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Article Title

Subject and Future on Development for Inhibitor

Bibtex

Ris

Effects of Metal Ions on Pitting Potential and Pit Growth Behavior for 316L Stainless Steel

Yoshinori Isomoto, Shinya Matsuo

pp. 213-218

DOI:

10.3323/jcorr.61.213

Abstract

A potentiostatic method was used to measure pitting potential for SUS316L stainless steel and compared with a potentiodynamic polarization method standardized by JIS G 0577. Test conditions were sodium chloride solutions from 0.008 to 1 M containing metal ions less than 110 ppm at temperatures of 300 and 323 K. The pitting potentials of SUS316L steel decreased with the increases in concentration of chloride ions and in temperature. The test results of pitting potential were consistent between the potentiostatic and potentiodynamic polarization methods. The presence of metal ions in a 0.08 M sodium chloride solution greatly decreased the pitting potential of SUS316L steel. Pits were grown from a steel surface by using a galvanostatic method proposed in this study, and observed in a cross-sectional surface after the growth tests. As a results, it is found that the low current density or metal irons of Mn²⁺ and Cr³⁺ added in the sodium chloride solution changed the aspect ratio of cross-sectional pit morphology and promoted deeper pit growth. Mechanisms of pit initiation and growth were discussed in this study.

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Article Title

Effects of Metal Ions on Pitting Potential and Pit Growth Behavior for 316L Stainless Steel

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Corrosion Behavior of Austenitic Stainless Steels on the Cut Edge Surface

Tomoaki Saida, Takuya Yamamoto, Katsuaki Sato, Shigeru Nakamura, Masazumi Okido

pp. 219-226

DOI:

10.3323/jcorr.61.219

Abstract

The cut edge surface of the stainless steel sheet is susceptible to corrosion compared with the surface of the sheet. At the cut edge surface, red rust easily tends to occur by the attack of chloride ion. However, there are still a lot of points not clear about the cause of the cut edge corrosion.
The salt spray test and the immersion test using NaCl solutions were conducted to evaluate corrosion resistance for the shear cut edge of SUS304 (18Cr-8Ni) and SUSXM7 (18Cr-9Ni-3Cu) cold rolled strips. It was found that transverse section (T section) corroded easier than longitudinal section (L section). In addition, the rust at the machined edge was less than shear cut edge.
The difference of the corrosion behavior in each section, L and T, was investigated by the electrochemical method. In anodic polarization curves at T section, the current density rose gradually at the less-noble potential than the L section. By the SEM observation and EPMA elemental mappings after anodic polarization measurement, it was considered that non-metallic inclusions (MnS etc.) extended along the metal flow of rolling direction influenced on the initiation and the growth of pitting corrosion.

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Article Title

Corrosion Behavior of Austenitic Stainless Steels on the Cut Edge Surface

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Zairyo-to-Kankyo Vol. 61 (2012), No. 5

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. 61 (2012), No. 5

Subject and Future on Development for Inhibitor

Share it with SNS

Effects of Metal Ions on Pitting Potential and Pit Growth Behavior for 316L Stainless Steel

Share it with SNS

Corrosion Behavior of Austenitic Stainless Steels on the Cut Edge Surface

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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