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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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Vol. 72 (2023)
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23 Sep. (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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Article Title

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

古代製鉄

鉄

blast furnace

smelting furnaces

jang-sik park

korea

three kingdoms period

archaeology

dp steel hydrogen embrittlement

furnaces

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

Relationship between slag phase and softening & melting properties of cohesive zone

Deformation-induced martensitic transformation at tensile and compressive deformations of bainitic steels with different carbon contents

Alloying effects on the microstructure of Fe-1mass%M binary alloys treated by austenitic nitriding and quenching treatment

Hydrogen effects on fracture resistances of bulk cementite evaluated by in-situ microbending test during cathodic hydrogen charging

Effect of Micro-Crack Depth on Fatigue Property in Zn–Ni Coated Press Hardened Steel

Numerical simulation of bubble breakup and coalescence behavior in gas-stirred ladle

Effect of slag phase on dephosphorization in BOF

Martensitic Transformation Behavior of Fe-Ni-C Alloys Monitored by In-situ Neutron Diffraction during Cryogenic Cooling

Room temperature aging of autotempered Fe–C martensite

Overview of hydrogen effects on γ−ε martensitic transformation in steels

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