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Zairyo-to-Kankyo
Vol. 58 (2009), No. 3

Zairyo-to-Kankyo Vol. 58 (2009), No. 3

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

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29 May. (Last 30 Days)

Zairyo-to-Kankyo Vol. 58 (2009), No. 3

Open Your Eyes –Corrosion versus Medichine–

Jun’ichi Sakai

pp. 81-81

DOI:

10.3323/jcorr.58.81

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Article Title

Open Your Eyes –Corrosion versus Medichine–

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Ris

Life Cycle Management of Port Structures – IV

Kazuaki Zen

pp. 82-85

DOI:

10.3323/jcorr.58.82

Abstract

Based on the PIANC PTC-II WG31 report¹⁾, the LCM of port structures has been introduced in Japan^2)-6). Especially, the two repair options with equal lives at the Kamsar Port are economically compared using the Present Worth (PW) method. In present worth analysis, the PW is calculated at the Minimum Attractive Rate of Return (MARR), which is an inflation-free interest rate. When inflation occurs, the effect of inflation on the PW method must be examined.
Since a present worth comparison involves calculating the equivalent present value of all future cash flows for each option, the PW of the options must be compared over the same number of years and end at the same time. The PW comparison of options with equal lives is straightforward. When options being compared have different lives, the Annual Worth (AW) method of comparing options is often preferred to the PW method, because AW comparison is performed for only one life cycle.
In this report, the effect of inflation on the PW method is considered using the data of the Kamsar Port in the WG31 report, and the application of the PW and AW methods to unequal-life options is shown.

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Life Cycle Management of Port Structures – IV

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Effects of Bubble Behavior on Erosion Corrosion of Copper Tubes in Hot-Water Supply System

Shinobu Suzuki, Yutaka Yamada, Kozo Kawano

pp. 99-104

DOI:

10.3323/jcorr.58.99

Abstract

The survey results of recent 120 leakage accidents showed that most of erosion corrosion failures of copper tubes in hot-water forced circulation system have been experienced at the downstream of joints of the return tubes. This tendency was the same as that of the research in 1996. The erosion corrosion of copper tube was observed when the concentration of dissolved oxygen in the hot-supply water was supersaturated and higher than that in supplied tap water. Therefore, it was presumed that erosion corrosion of copper tube was caused by the bubbles formed by pressure change in hot-water forced circulation system. The results of Computational fluid dynamics (CFD) simulations and the observation of the flow pattern in the model plumbing equipment showed that the locus of the micro-bubbles affect of the erosion corrosion of copper tube. According to the Young-Laplace equation, more small bubbles have high pressure in inside of the bubble, and maintain as the bubble without coalesce or collapse of bubbles. Consequently, it could be considered that erosion corrosion of copper tube occurred and propagated when the protective films formed on the tubes surfaces were continuously broken by micro-bubbles.

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Effects of Bubble Behavior on Erosion Corrosion of Copper Tubes in Hot-Water Supply System

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Corrosion Behavior of AZ31 Magnesium Alloy in Dilute Sodium Chloride Solutions

Lei Wang, Tadashi Shinohara, Bo-Ping Zhang

pp. 105-110

DOI:

10.3323/jcorr.58.105

Abstract

Corrosion behavior of AZ31 magnesium alloy in dilute NaCl solutions was studied by electrochemical techniques. Its surface film was chemically characterized by X-ray diffraction (XRD). A corrosion map in terms of electrode potential and chloride concentration [Cl^–] was obtained by using electrochemical measurements. With the map, passivation and corrosion zones were determined. The passivation zone was found to become narrow with the increasing of [Cl^–] . The values of E_ocp, open-circuit potential, in nondeaerated NaCl solutions were in the passivation zone when [Cl^–] <0.2 M and in the corrosion zone when [Cl^–] ≥0.2 M. The reduction reactions of dissolved oxygen and hydrogen evolution worked as cathodic reactions in nondeaerated solutions. By XRD analyses, Mg(OH)₂, magnesium hydroxyl carbonate, and MgO were the dominant products in the corrosion zone, whereas magnesium hydroxyl carbonate and MgO were the main components in the passivated film.

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Article Title

Corrosion Behavior of AZ31 Magnesium Alloy in Dilute Sodium Chloride Solutions

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Zairyo-to-Kankyo Vol. 58 (2009), No. 3

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welding

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Zairyo-to-Kankyo Vol. 58 (2009), No. 3

Open Your Eyes –Corrosion versus Medichine–

Share it with SNS

Life Cycle Management of Port Structures – IV

Share it with SNS

Effects of Bubble Behavior on Erosion Corrosion of Copper Tubes in Hot-Water Supply System

Share it with SNS

Corrosion Behavior of AZ31 Magnesium Alloy in Dilute Sodium Chloride Solutions

Share it with SNS

Article Access Ranking

Automatic Ultrasonic Testing of Non-metallic Inclusions Detectable with Size of Several Tens of Micrometers Using a Double Probe Technique along the Longitudinal Axis of a Small-diameter Bar

A three dimensional real-time heat transfer model for continuous casting blooms

Heterogeneous Chemical State of Carbon in Fe-C Binary Alloys

Effect of Parallel Granulation with Inclined Mixing of Limestone on Melt and Assimilation Behavior

日本鉄鋼協会第91回講演大会講演大要

Low Density Fe–Mn–Al–C Steels: Phase Structures, Mechanisms and Properties

Effects of Liquidus Temperature and Liquid Amount on the Fluidity of Bonding Phase and Strength of Sinter

Torque Model in Plate Rolling Process with Biting Impact Considered

Optimization and Improvement of the Projection Welding of Nut Based on Regression Analysis

Microwave-hydrogen synergistic reduction of vanadium titano-magnetite

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