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Zairyo-to-Kankyo Vol. 60 (2011), No. 1

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

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Zairyo-to-Kankyo Vol. 60 (2011), No. 1

Technological Transition of Corrosion Prevention for Marine Steel Structures

Masami Abe

pp. 3-8

DOI:

10.3323/jcorr.60.3

Abstract

Steel is important materials for construction of marine steel structures. However, it has a weak point of corrosion.
Therefore, from old days, countermeasure of corrosion prevention has been working for maintenance of marine steel structures.
This report describes the change of construction and technological transition of corrosion prevention for marine steel structures.

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Technological Transition of Corrosion Prevention for Marine Steel Structures

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Influence of Residual Rust on Underlying Steel Surface on Performance of Heavy-duty Coating

Masanori Hattori, Atushi Nishikata, Tooru Tsuru

pp. 15-21

DOI:

10.3323/jcorr.60.15

Abstract

The influence of the residual rust on the steel surface before applying a heavy-duty coating on the performance was investigated under two accelerated corrosion tests; sunshine weathering meter and immersion tests. The different amounts of the rust were formed on the steel sheets by immersing in NaCl solution for various time periods. They were dried and painted with Polyester-urethane resin of 260 μm thick. The coating degradation and underlying steel corrosion were evaluated by surface observation and electrochemical impedance spectroscopy (EIS). The feasibility of the application of EIS to evaluation of the corrosion performance of the heavy-duty paint was also discussed.

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Influence of Residual Rust on Underlying Steel Surface on Performance of Heavy-duty Coating

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Galvanic Corrosion Behavior between Aluminum and Copper Caused by NaCl Aqueous Solutions

Rongguang Wang, Hiroo Nagano

pp. 22-27

DOI:

10.3323/jcorr.60.22

Abstract

In this work, polarization measurement, galvanic current density measurement and spray test were carried out on aluminum (Al), copper (Cu) and Al/Cu couples in NaCl aqueous solutions with different temperatures and different levels of NaCl and aeration. The corrosion current density of Al at 323 K in aerated 1.0 mass% NaCl solution is about 60 times as high as that deaerated with nitrogen, whereas the corrosion current density in aerated 1.0% NaCl solution at 323 K is about 3 times as high as that at 303 K. The corrosion potentials of Al and Cu shifted to negative direction when the NaCl concentration increased from 0.01% to 1.0%. A clear passive region was observed on the Al specimen when the NaCl concentration is below 0.005%. The galvanic current density between the Al/Cu couple increased with the increase in NaCl concentration. In the spray test, the corrosion on the Al side of the Al/Cu couple became more severe with the increase in NaCl concentration and the decrease in the face-to-face distance between Al and Cu.

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Galvanic Corrosion Behavior between Aluminum and Copper Caused by NaCl Aqueous Solutions

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Investigation of Depassivation-repassivation Behavior of Metal Surfaces Using Micro-indentation Test

Takatoshi Shimada (Yamamoto), Koji Fushimi

pp. 28-38

DOI:

10.3323/jcorr.60.28

Abstract

A micro-indentation test was developed to investigate mechano-electochemical properties of metal surfaces. In solution environment, the contact of an indenter with an iron passive surface causes depassivation of the surface when the surface deforms plastically. The scale of the depassivation is dependent on hardness and deformation area of the substrate iron. Repassivation following depassivation is affected by not only electrode potential of the specimen and solution conditions (pH and electric conductivity of the solution) but also dislocation in the substrate iron. Furthermore, the micro-indentation test is useful as a rupture technique of the passive film in order to examine the corrosion resistance of stainless steels. It enables to control the deformation area of metal surfaces at an intentional site in a micrometer-order and to serve an in-situ measurement of electrochemical responses. This technique is suitable for consideration of the mechanism and kinetics of depassivation-repassivation behavior of the surface depending on fine metal structures.

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Investigation of Depassivation-repassivation Behavior of Metal Surfaces Using Micro-indentation Test

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