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Zairyo-to-Kankyo
Vol. 65 (2016), No. 3

Zairyo-to-Kankyo Vol. 65 (2016), No. 3

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

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Vol. 65 (2016)
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Zairyo-to-Kankyo Vol. 65 (2016), No. 3

Impressions as One Member of JSCE

Kazuhiko Noda

pp. 79-79

DOI:

10.3323/jcorr.65.79

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Impressions as One Member of JSCE

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Ris

Diagnosis of Copper Tube Corrosion by Water Quality Analysis of Cooling Water Flowing Through Copper Heat Exchanger of Air-conditioner

Yoshinao Hoshi, Kentaro Ochi, Isao Shitanda, Masayuki Itagaki, Kyouichi Sekiguchi, Youichi Hirata, Takashi Hishinuma

pp. 88-94

DOI:

10.3323/jcorr.65.88

Abstract

The tendency of pitting corrosion on copper tubes of heat exchangers was investigated by analyzing the quality of cooling water sampled from air-conditioning units at different cities in Japan. A two-dimensional diagram (2DD) was constructed with two parameters chosen from water quality conditions, i.e., total hardness, acid consumption, pH, concentrations of SO₄^2― and Cl^―. The results of 2DD analyses demonstrated that the acid consumption was strongly related to the susceptibility of copper pitting corrosion. In order to make a diagnosis of copper pitting corrosion, we proposed a three-dimensional diagram (3DD). The axes of 3DD were the acid consumption, pH and ratio of amount of Cl^― + SO₄^2― ions to total anions (HCO₃^―, Cl^― and SO₄^2―). This diagram indicated that the cooling water sampled from air-conditioning units could be divided into high and low pitting corrosion risk categories precisely. In addition, the simulated cooling water was prepared in the laboratory to assist the effectiveness of the proposed 3DD analysis. The anodic polarization curves of copper electrode were measured in the simulated cooling water as the accelerated test for pitting corrosion susceptibility. The 3DD analysis was applied to the discrimination of corrosive properties of simulated cooling water after accelerated test. The surface morphology of copper electrode was analyzed by the optical microscope. The results of 3DD analyses were in good agreement with those of surface morphologies of copper electrode after anodic polarization curve measurement. These results implied that 3DD allowed the screening of cooling water related to the risk of pitting corrosion on copper tubes of heat exchangers.

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Article Title

Diagnosis of Copper Tube Corrosion by Water Quality Analysis of Cooling Water Flowing Through Copper Heat Exchanger of Air-conditioner

Bibtex

Ris

Corrosion Protection of Metals and Oxidized Metals by Ultrathin Two-Dimensional Polymer Coatings Prepared by Chemical Modification of Three Types of Self-Assembled Monolayers

Kunitsugu Aramaki, Tadashi Shimura

pp. 95-102

DOI:

10.3323/jcorr.65.95

Abstract

Three types of self-assembled monolayers (SAMs) were prepared on metals and oxidized metals. They are an alkanethiol SAM chemically adsorbed on Cu and Fe, a benzene derivative SAM adsorbed on Fe by the formation of an Fe-C covalent bond and a carboxylate ion SAM chemisorbed on the surfaces of passivated Fe and hydrated Ce₂O₃ layer-coated Zn. Ultrathin (nm order thickness), ordered (self-assembly) and interconnected (two-dimensional polymer) protective coatings were synthesized by chemical modification of the SAMs adsorbed on metals and oxidized metals with silane coupling agents. The protective effects of these coatings on corrosion of substrate metals and passive film breakdown in oxygenated neutral solutions are summarized in this paper. The protective efficiency of the polymer coating on Cu in aerated 0.5 M Na₂SO₄ was extremely high, 99.3% at 1 h of the immersion time but decreased markedly after 20 h. The polymer coating of the benzene derivative SAM protected Fe from corrosion in the long range of the immersion time. Complete protection against corrosion of Fe was accomplished by coverage of a passivated Fe electrode with the two-dimensional polymer coating in the solutions, unless the passive film was broken down.

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Article Title

Corrosion Protection of Metals and Oxidized Metals by Ultrathin Two-Dimensional Polymer Coatings Prepared by Chemical Modification of Three Types of Self-Assembled Monolayers

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Ris

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Effects of alloying-element addition on hydrogen diffusion and hydrogen absorption in Ni

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Zairyo-to-Kankyo Vol. 65 (2016), No. 3

Keyword Ranking

blast furnace

electoromagnetic

melt

mg treatment inclusion

ステンレス鋼 ti-ni

electoromagnetic segregation

magnethydrodynamics

technol. plast

thermo dynamics and kinetics of coal gasification in a liquid iron bath

岡本

Zairyo-to-Kankyo Vol. 65 (2016), No. 3

Impressions as One Member of JSCE

Share it with SNS

Diagnosis of Copper Tube Corrosion by Water Quality Analysis of Cooling Water Flowing Through Copper Heat Exchanger of Air-conditioner

Share it with SNS

Corrosion Protection of Metals and Oxidized Metals by Ultrathin Two-Dimensional Polymer Coatings Prepared by Chemical Modification of Three Types of Self-Assembled Monolayers

Share it with SNS

Article Access Ranking

Wettability of CaS Against Molten Iron at 1873 K

Perspectives on the Promising Pathways to Zero Carbon Emissions in the Steel Industry toward 2050

New Electromagnetic Flow Control System for Optimization of Molten Steel Flow in Continuous Casting Mold

Preface to the Special Issue on “Challenges to Comprehension for Phenomena of Degradation, Softening, and Melting of Raw Materials in Hydrogen-enriched Ironmaking Process”

Effect of Al in the coating layer of Zn-coated steel sheet on Zn oxidation during hot-stamping heating

Growth, Removal, and Agglomeration of Various Type of Oxide Inclusions in Molten Steel

Investigation of the Effects of Mechanical Properties and Carbon Content on Cold Cracking in Laser Welds of High-strength Thin Steel Sheets

Effect of Water on the Non-Isothermal Hydrogen-Water Reduction of Industrial Hematite Pellets

Low Temperature Reduction Disintegration Mechanism of Self-fluxing Pellet under High Hydrogen Condition of Blast Furnace at 500°C

Effects of alloying-element addition on hydrogen diffusion and hydrogen absorption in Ni

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