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Zairyo-to-Kankyo
Vol. 69 (2020), No. 1

Zairyo-to-Kankyo Vol. 69 (2020), No. 1

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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30 May. (Last 30 Days)

Zairyo-to-Kankyo Vol. 69 (2020), No. 1

Joint Research Committee

Hiroshi Kawakami

pp. 1-2

DOI:

10.3323/jcorr.69.1

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Article Title

Joint Research Committee

Bibtex

Ris

Analysis on the Growth Mechanism of Corrosion Products of Copper Materials Containing Brass by Voltammetry

Shigeyoshi Nakayama, Aiko Tominaga, Hiroyuki Fujioka, Takenori Notoya, Toshiyuki Osakai

pp. 10-16

DOI:

10.3323/jcorr.69.10

Abstract

Corrosion products on the brass surface were characterized by voltammetry with a high alkaline electrolyte solution （6 M KOH＋1 M LiOH）. In addition to copper oxides （Cu₂O and CuO）, zinc oxide （ZnO） was also confirmed on corroded brass surfaces. Depending on corrosion conditions, the amounts of the respective oxides formed on brass surfaces were varied. In the corrosion test in which brass is immersed in a NaCl solution （by assuming dezincification corrosion）, Cu₂O was selectively formed, and then grew significantly in NaCl solution at the concentration of 0.1％ or less. However, when the concentration exceeded 1％, the formation of ZnO was newly confirmed. It was suggested that the formation and growth behaviors of the oxides on brass should be affected by the diffusion rate of zinc dependent on the concentration of NaCl solution.

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Analysis on the Growth Mechanism of Corrosion Products of Copper Materials Containing Brass by Voltammetry

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Effect of Deposits on Corrosion of Copper Tubes in a Circulating Cooling Water System

Hidefumi Yamanaka, Tomoyuki Nagai, Hidemasa Nonaka, Hiroaki Tsuchiya, Shinji Fujimoto

pp. 17-25

DOI:

10.3323/jcorr.69.17

Abstract

In the present study, possible effect of deposits on the corrosion of copper pipes in concentrated cooling water has been examined. It was considered that during the localized corrosion of copper pipes, the cathodic process took place on the intact sites of carbonaceous films, whereas the anodic process occurred on their defective sites. The deposits covering the defects of carbonaceous films significantly affected the corrosion of copper pipes. In particular, the presence of iron rust strongly enhanced the anodic reaction, resulting in severe corrosion. The enhanced anodic reaction was attributed to the suppressed formation of a protective oxide film most likely due to the lower pH of the areas located beneath the iron rust. It was suggested that the pretreatment to form a protective copper oxide film onto the copper pipe surface inhibited the corrosion process beneath the iron rust deposit.

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Article Title

Effect of Deposits on Corrosion of Copper Tubes in a Circulating Cooling Water System

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Zairyo-to-Kankyo Vol. 69 (2020), No. 1

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welding

tundish

steel

osamu

powder injection

asahi higashiyama sogo ueno

carbon deposit

corrosion

electromagnetic stirring

hydrogen trapping vc

Zairyo-to-Kankyo Vol. 69 (2020), No. 1

Joint Research Committee

Share it with SNS

Analysis on the Growth Mechanism of Corrosion Products of Copper Materials Containing Brass by Voltammetry

Share it with SNS

Effect of Deposits on Corrosion of Copper Tubes in a Circulating Cooling Water System

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

Effects of Temperatures of Rolling and Annealing on Microstructures and Tensile Properties of Low Carbon Ferritic Low Density Steels

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

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