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Zairyo-to-Kankyo
Vol. 69 (2020), No. 2

Zairyo-to-Kankyo Vol. 69 (2020), No. 2

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. 69 (2020), No. 2

The Mystery of Corrosion Protection

Masaaki Yano

pp. 29-30

DOI:

10.3323/jcorr.69.29

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Article Title

The Mystery of Corrosion Protection

Bibtex

Ris

The pH in Crevice Measured by a Semiconductor Chemical Sensor and Relationship with Crevice Corrosion Behavior of Stainless Steel

Kiyomi Nose, Haruhiko Kajimura, Ko-ichiro Miyamoto, Tatsuo Yoshinobu

pp. 40-48

DOI:

10.3323/jcorr.69.40

Abstract

In order to clarify the relationship between crevice corrosion behavior of SUS304 and the pH in crevice（pH_c）, simultaneous measurement of pH in crevice by semiconductor chemical sensor at potentiostatic polarization.The pH measured by the sensor is not influenced by the metal ion and shows the value reflecting［ H^＋］ and γ_H^＋.When crevice corrosion is always progressing by potentiostatic polarization, among the metal ions dissolved in the crevice, mainly in the hydrolysis reaction of Cr^3＋ or formation of chloride complex ions, the entire crevice part becomes extremely low pH environment with pH_c＜0.0.On the other hand, when polarization by two-step potentiostatic polarization, the amount of metal dissolved in the crevice decreases depending on the second potential（E₂）, and finally, eventually leading to re-passivation.In the case of this study, the re-passivation pH after crevice corrosion progression was 2.5 to 3, and the repassivation potential was about 80 mV, which gave high engineering significance.

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The pH in Crevice Measured by a Semiconductor Chemical Sensor and Relationship with Crevice Corrosion Behavior of Stainless Steel

Bibtex

Ris

The Effect Of Chloride Ion and Dissolved Oxygen Concentration On Passivation pH of SUS304 Stainless Steel

Akira Nagaoka, Ryo Matsuhashi, Kiyomi Nose, Kazumi Matsuoka, Haruhiko Kajimura

pp. 49-57

DOI:

10.3323/jcorr.69.49

Abstract

When crevice corrosion of stainless steel occurs and progresses, the proton and the chloride ion concentration is high and there is no dissolved oxygen in the crevice. On the other hand, when crevice corrosion of stainless steel stops, the proton and the chloride ion diffuses out of the crevice and dissolved oxygen penetrates the inside of the crevice. In this case, the state of the stainless steel changes from active state to passive state.Since it is important to know the passivation behavior of the stainless steel, we invest the effect of chloride ion and dissolved oxygen concentration on passivation pH of SUS304 stainless steel.The passivation pH of SUS304 steel increased with increasing chloride ion concentration and decreasing dissolved oxygen. When cathodic current density exceeds I_CRIT, passivation occurs.Therefore, It is assumed that the rise of I_CRIT and the decrease of cathodic current density of the proton reduction with the rise of chloride ion concentration and the decrease of cathodic current density of the oxygen reduction with the decrease of dissolved oxygen concentration contributes to increasing passivation pH.

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Article Title

The Effect Of Chloride Ion and Dissolved Oxygen Concentration On Passivation pH of SUS304 Stainless Steel

Bibtex

Ris

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Zairyo-to-Kankyo Vol. 69 (2020), No. 2

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. 69 (2020), No. 2

The Mystery of Corrosion Protection

Share it with SNS

The pH in Crevice Measured by a Semiconductor Chemical Sensor and Relationship with Crevice Corrosion Behavior of Stainless Steel

Share it with SNS

The Effect Of Chloride Ion and Dissolved Oxygen Concentration On Passivation pH of SUS304 Stainless Steel

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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