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

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

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