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Zairyo-to-Kankyo
Vol. 68 (2019), No. 11

Zairyo-to-Kankyo Vol. 68 (2019), No. 11

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

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21 Jan. (Last 30 Days)

Zairyo-to-Kankyo Vol. 68 (2019), No. 11

I Would Not Corrode Myself

Yasuki Matsukawa

pp. 299-299

DOI:

10.3323/jcorr.68.299

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I Would Not Corrode Myself

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Evaluation of Chloride Ion Concentration and pH on Depassivation of Steel Rebar in Concrete Investigated by Electrochemical Impedance Measurement of Probe Electrodes

Yoshinao Hoshi, Shuhei Watanabe, Hiroyuki Tokieda, Isao Shitanda, Masayuki Itagaki

pp. 303-308

DOI:

10.3323/jcorr.68.303

Abstract

Relationship between chloride ion concentration and pH on depassivation of steel rebar embedded in concrete was investigated by a two frequencies impedance measurement using probe electrodes. A saturated calcium hydroxide solution was used for the electrolyte solution as simulated concrete pore solution. The pair of probe electrodes, which simulates the steel rebar, was immersed in the electrolyte solution prepared by arbitrary concentration of chloride ions, and the two frequencies impedance measurement was performed. Air was supplied to the electrolyte solution in order to simulate the neutralization of concrete during the measurement. The charge transfer resistance related to electrode/solution interface, R_ct, were estimated from the two frequencies impedance measurement of probe electrodes in each electrolyte solution, demonstrating that the R_ct was drastically decreased with decreasing the pH of electrolyte solution, namely, the depassivation on steel rebar. The corrosion conditions of steel rebar were categorized as “passive state”, “depassivation”, and “corrosion” based on the changes of monitoring of R_ct and pH in each electrolyte solution, and these results were plotted on the two dimensional diagram composed of chloride ion concentration and pH of electrolyte solution. The conditions for depassivation of passive film on steel rebar were discussed.

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Fundamental Properties of Concrete Mixed with Seawater from Arabian Gulf

Hiroshi Takenaka, Saud Al-Otaibi, Jayasree Chakkmalayath

pp. 309-312

DOI:

10.3323/jcorr.68.309

Abstract

The authors participated in a project “Technical collaboration project on seawater utilization for concrete structure of petroleum facilities as construction and maintenance management, Kuwait” that Japan Society of Corrosion Engineering （JSCE） received from Japan Cooperation Center Petroleum （JCCP）, and supported research in Kuwait. In this paper, the results of the study on concrete mixed with seawater performed as part of the above project are reported.

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Fundamental Properties of Concrete Mixed with Seawater from Arabian Gulf

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Considerations Based on the HSAB Principle for Inhibition Mechanisms of Cationic Precipitation Inhibitors in Aerated Neutral Solutions

Kunitsugu Aramaki

pp. 313-316

DOI:

10.3323/jcorr.68.313

Abstract

In the present paper, cationic precipitation inhibitors effective for Fe corrosion in aerated 0.5 M Na₂SO₄ are discussed based on the hard and soft acids and bases （HSAB） principle. Multivalent metallic cations are readily precipitated by the formation of their hydroxides due to stable hard acid and hard base interaction. They suppress the cathodic process of Fe corrosion, reduction of dissolved oxygen but promote the anodic process of Fe dissolution. High inhibition efficiencies are obtained by the addition of anionic precipitation inhibitors suppressing the anodic process. On the other hand, high concentration of cerium （III） ion, Ce^3＋ inhibits both cathodic and anodic processes by the direct formation of oxide layer with evolution of H₂.

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Considerations Based on the HSAB Principle for Inhibition Mechanisms of Cationic Precipitation Inhibitors in Aerated Neutral Solutions

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Spatial Distribution Characteristics and Prediction of Airborne Salt Level in Shimane

Makoto Ohya, Masamichi Takebe, Nozomu Hirose, Toshiki Itoga, Yoshihiro Shirako

pp. 317-320

DOI:

10.3323/jcorr.68.317

Abstract

In order to understand the flying characteristics of the amount of salinity derived from sea, a wide-area airborne salt survey in Shimane was conducted during the same period. The resulting data is a valuable materials in predicting the spatial distribution of airborne salt level. We discuss the relationship between the measured values of airborne salt level and the predicted values proposed by the authors by use of meteorological observation data. It was confirmed that the prediction of the airborne salt level from the meteorological observation data was possible with considerable accuracy.

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Spatial Distribution Characteristics and Prediction of Airborne Salt Level in Shimane

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Corrosion Model of Carbon Steel Pipe on Manhole

Akira Ito, Norihiro Fujimoto, Yosuke Okamura, Hiroyuki Saito, Takanobu Suzuki

pp. 321-325

DOI:

10.3323/jcorr.68.321

Abstract

Many facilities were built underground to maintain communication, and they have been feared that corrosion of the inner surface of a steel pipe may cause failure in cable laying or reduct the seismic performance. To obtain long-term corrosion rate, a specimen made of steel pipe was placed in a manhole that is assumed to be close to the actual environment, and the corrosion rate was measured by inspecting the weight loss over four years. In addition to this, the specimen are observed with SEM and analyzed with XPS. There are some dense layers on specimen consist of FeOOH, Fe₃O₄, Fe（OH）₂CO₃. Because of dense layer, corrosion rate can be proportional to 1/2 power of time. The coefficients of the model equation were determined from the measured values.

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Corrosion Model of Carbon Steel Pipe on Manhole

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Zairyo-to-Kankyo Vol. 68 (2019), No. 11

Keyword Ranking

spring steel

abstract

journal title

author

article title

6.5 silicon steel

daisuke kasai

effect of the substrate properties on the surface quality of galvannealed steel sheets

hydrogen reduction of iron ore

article title;echo $((725 + 2130))&echo $((725 + 2130))|echo $((725 + 2130))article title

Zairyo-to-Kankyo Vol. 68 (2019), No. 11

I Would Not Corrode Myself

Share it with SNS

Evaluation of Chloride Ion Concentration and pH on Depassivation of Steel Rebar in Concrete Investigated by Electrochemical Impedance Measurement of Probe Electrodes

Share it with SNS

Fundamental Properties of Concrete Mixed with Seawater from Arabian Gulf

Share it with SNS

Considerations Based on the HSAB Principle for Inhibition Mechanisms of Cationic Precipitation Inhibitors in Aerated Neutral Solutions

Share it with SNS

Spatial Distribution Characteristics and Prediction of Airborne Salt Level in Shimane

Share it with SNS

Corrosion Model of Carbon Steel Pipe on Manhole

Share it with SNS

Article Access Ranking

Wettability of CaS against molten iron at 1873 K

Coating Structure and Corrosion Mechanism of Zn-19%Al-6%Mg Alloy Coating Layer

Preface to the Special Issue on “New Developments in High Temperature Processing of Steels and Related Materials Leading the Sustainable Society, and Key Properties of High Temperature Melts”

Settling of Particle in Foaming Slag

Evaluation of Activity Coefficients of Oxygen and Nitrogen in Molten Alloy and Its Dominant Factors Based on Solvation Shell Model

Effect of Cooling Rate on Microstructure, Phases, and Properties of Al-Si Coated Hot-Press-Forming Steel Sheets

Integrated Experimental Phase Equilibria and Thermodynamic Modelling Investigation of the FeO–Fe₂O₃–MgO and the FeO–Fe₂O₃–MgO–SiO₂ Systems. Part I: Experimental Results in Air

Phase Equilibria of the Iron-rich Corner of the CaO–Fe₂O₃–Al₂O₃ System at 1240°C in Air

Reduction and Carburization Behaviors of Iron Oxide Composite with Iron Carbide and Free Carbon

Terminal Settling Velocity of Particle in Suspension

Advanced Search

Zairyo-to-Kankyo Vol. 68 (2019), No. 11

Keyword Ranking

spring steel

abstract

journal title

author

article title

6.5 silicon steel

daisuke kasai

effect of the substrate properties on the surface quality of galvannealed steel sheets

hydrogen reduction of iron ore

article title;echo $((725 + 2130))&echo $((725 + 2130))|echo $((725 + 2130))article title

Zairyo-to-Kankyo Vol. 68 (2019), No. 11

I Would Not Corrode Myself

Share it with SNS

Evaluation of Chloride Ion Concentration and pH on Depassivation of Steel Rebar in Concrete Investigated by Electrochemical Impedance Measurement of Probe Electrodes

Share it with SNS

Fundamental Properties of Concrete Mixed with Seawater from Arabian Gulf

Share it with SNS

Considerations Based on the HSAB Principle for Inhibition Mechanisms of Cationic Precipitation Inhibitors in Aerated Neutral Solutions

Share it with SNS

Spatial Distribution Characteristics and Prediction of Airborne Salt Level in Shimane

Share it with SNS

Corrosion Model of Carbon Steel Pipe on Manhole

Share it with SNS

Article Access Ranking

Wettability of CaS against molten iron at 1873 K

Coating Structure and Corrosion Mechanism of Zn-19%Al-6%Mg Alloy Coating Layer

Preface to the Special Issue on “New Developments in High Temperature Processing of Steels and Related Materials Leading the Sustainable Society, and Key Properties of High Temperature Melts”

Settling of Particle in Foaming Slag

Evaluation of Activity Coefficients of Oxygen and Nitrogen in Molten Alloy and Its Dominant Factors Based on Solvation Shell Model

Effect of Cooling Rate on Microstructure, Phases, and Properties of Al-Si Coated Hot-Press-Forming Steel Sheets

Integrated Experimental Phase Equilibria and Thermodynamic Modelling Investigation of the FeO–Fe2O3–MgO and the FeO–Fe2O3–MgO–SiO2 Systems. Part I: Experimental Results in Air

Phase Equilibria of the Iron-rich Corner of the CaO–Fe2O3–Al2O3 System at 1240°C in Air

Reduction and Carburization Behaviors of Iron Oxide Composite with Iron Carbide and Free Carbon

Terminal Settling Velocity of Particle in Suspension

Advanced Search

Integrated Experimental Phase Equilibria and Thermodynamic Modelling Investigation of the FeO–Fe₂O₃–MgO and the FeO–Fe₂O₃–MgO–SiO₂ Systems. Part I: Experimental Results in Air

Phase Equilibria of the Iron-rich Corner of the CaO–Fe₂O₃–Al₂O₃ System at 1240°C in Air