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

Yamanaka, Hidefumi; Nagai, T.; Nonaka, Hidemasa; Tsuchiya, Hiroaki; Fujimoto, Shinji

doi:10.3323/jcorr.69.17

Cited by 2 publications

(2 citation statements)

References 4 publications

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“…Figure 10 shows the changes over time in the measured values of the galvanic current at each area ratio. The galvanic current flowed so that the test specimen with a residual carbon amount of 0 mg/m 2 became the anode and the test specimen with 23.0 mg/m 2 became the cathode, which was the same as previous reports [8] [9]. The current density was stable 30 s from the start of measurement Open Journal of Composite Materials regardless of the area ratio.…”

Section: Test I Evaluation By Xps Analysissupporting

confidence: 63%

Simple Measurement of Carbon Films on Copper Tubes and Their Effects on Corrosion

Iyasu¹,

Kuratani²,

Ikeda³

et al. 2021

OJCM

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Section: Test I Evaluation By Xps Analysissupporting

confidence: 63%

Simple Measurement of Carbon Films on Copper Tubes and Their Effects on Corrosion

Iyasu¹,

Kuratani²,

Ikeda³

et al. 2021

OJCM

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“…Copper tubes are resistant to corrosion in freshwater but may experience pitting corrosion. It has been reported that one of the causes of this pitting corrosion is the effect of the residual carbon on the inner surface of the copper tube [1] [2] [3] [4].…”

Section: Introductionmentioning

confidence: 99%

A Study of Water Treatment Chemical Effects on Type I” Pitting Corrosion of Copper Tubes

Iyasu¹,

Kuratani²,

Ikeda³

et al. 2020

MSA

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It is known that one of the causes of pitting corrosion of copper tubes is residual carbon on the inner surface. It was confirmed that type I" pitting corrosion of the copper tube is suppressed by keeping the residual carbon amount at 2 mg/m 2 or less, which is lower than that of the type I' pitting corrosion, or by removing the fine particles that are the corrosion product of galvanized steel pipes. The developed water treatment chemical was evaluated using three types of copper tubes with residual carbon amounts of 0 mg/m 2 , 0.5 mg/m 2 , and 6.1 mg/m 2. The evaluation was conducted for three months in an open-circulation cooling water system and compared with the current water treatment chemical. Under the current water treatment chemical conditions, only the copper tube with a residual carbon amount of 6.1 mg/m 2 showed a significant increase in the natural corrosion potential after two weeks, and pitting corrosion occurred. No pitting corrosion and no increase in the natural corrosion potential were observed in any of the copper tubes that were treated with the developed water treatment chemical. In addition, the polarization curve was measured using the cooling water from this field test, and the anodic polarization of two cooling waters was compared. For copper tubes with a large amount of residual carbon, the current density near 0 mV vs. Ag/AgCl electrode (SSE) increased when the developed water treatment chemical was added.

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

Cited by 2 publications

References 4 publications

Simple Measurement of Carbon Films on Copper Tubes and Their Effects on Corrosion

Simple Measurement of Carbon Films on Copper Tubes and Their Effects on Corrosion

A Study of Water Treatment Chemical Effects on Type I” Pitting Corrosion of Copper Tubes

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