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Evolution of Annealing Twins and Recrystallization Texture in Thin-Walled copper tube During Heat Treatment

Acta Metallurgica Sinica(English Letters) 2020年第12期33卷 1618-1626页

作者： Song-Wei Wang Hong-Wu Song Yan Chen Shi-Hong Zhang Hai-Hong Li Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 100049China School of Nuclear Equipment and Nuclear Engineering Yantai UniversityYantai 264005China

Thin-walled copper tubes are usually produced by multi-pass float-plug drawing *** general,the annealing treatment subsequently is necessary to release the stored energy and adjusts the *** this study,an investigation on the evolution of annealing twins as well as textures in the thin-walled(Φ6 mm×0.3 mm)copper tube underwent holding time-free heat treatment was *** backscattered diffraction analysis reveals that a large number ofΣ3 boundaries(600twin relationship)are produced at the early stage of heat treatment,which is due to the lower boundary *** the recrystallization proceeding,the migration rate of grain boundaries decreases on account of the grain growth;meanwhile,the uniqueΣ9 boundaries(38.9°relationship)are formed due to the interaction of theΣ3 *** a result,the number fractions ofΣ3 boundaries and high-angle grain boundaries decrease *** the grain growth stage,a strong recrystallization texture was formed due to the fact that the grains of Goss orientation have a growth advantage over the *** a result,the initial copper texture was transferred into the Goss texture in domination.

关键词： copper tube Annealing twin Heat treatment Electron backscattered diffraction(EBSD)analysis Recrystallization texture

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Macrostructure and properties of thin walled copper tubes prepared by the downward continuous unidirectional solidification method

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International Journal of Minerals,Metallurgy and Materials 2010年第1期17卷 63-68页

作者： Xi Shen Hong Zhang Zi-dong Wang Hua-fen Lou Yi-ming Jia Ping-xia Hu School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China CHINALCO Luoyang copper Co. Ltd. Luoyang 471000 China

The macrostructure and properties of the thin walled copper tube prepared by the downward continuous unidirectional solidification （DCUS） method were studied. The result shows that the macrostructure is closely related to the solid-liquid interface profile, which is influenced by the distance between the cooling water location and the solidification front. The mechanical properties of the thin walled copper tube prepared by the DCUS method are near those of the normal cast copper, and it has good relative density, electrical conductivity, and elongation, which are not greatly affected by casting speed. The thin walled copper tube prepared by the DCUS method also has good processing properties that can be taken to further drawing procedures directly without an intermediate process, and obtains good mechanical properties with the total processing rate of 89.8%.

关键词： unidirectional solidification copper tube short process macrostructure mechanical properties

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A Study of Water Treatment Chemical Effects on Type I” Pitting Corrosion of copper tubes

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Materials Sciences and Applications 2020年第7期11卷 494-504页

作者： Takashi Iyasu Motoki Kuratani Itaru Ikeda Noriyuki Tanaka Yutaka Yamada Osamu Sakurada Technical Support Department Kurita Water Industries Ltd. Tochigi Japan Gifu University Gifu Japan Technical Research Laboratory DAI-DAN Co. Ltd. Saitama Japan

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/m2 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/m2, 0.5 mg/m2, and 6.1 mg/m2. 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/m2 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.

关键词： copper tube Pitting Corrosion Residual Carbon Cooling Water System Water Treatment

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Simple Measurement of Carbon Films on copper tubes and Their Effects on Corrosion

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Open Journal of Composite Materials 2021年第1期11卷 12-22页

It has been reported that pitting corrosion in copper tubes occurs due to the effect of a carbon film produced by the influence of undergoing an oil and heat treatment. As a quantitative method for determining the residual carbon amount, it has been reported that the inner surface of a copper tube can be dissolved with a mixed acid to collect and analyze the adhering carbon;however, this method is dangerous and difficult. Therefore, two methods were examined as a simple quantitative method for obtaining the residual carbon amount using copper tubes with known residual carbon amounts. One method utilizes X-ray photoelectron spectroscopy (XPS), and the other method utilizes the potential difference between the carbon film-adhered surface and carbon film-removed surface. In regard to XPS measurement, a linear correlation was found between the spectral intensity of C and the residual carbon amount;therefore, XPS measurements were considered to be effective as a simple measurement method for the carbon film on the inner surface of a copper tube. In the evaluation method by measuring the corrosion potential, a correlation was observed between the potential difference ΔE and the residual carbon amount of the inner surface of the tube and the outer surface of the polished tube. It is considered possible to estimate the residual carbon amount from the prepared calibration curve. Through these studies, it is suggested that the carbon film was non-uniformly present on the surface of the copper tube. Therefore, the galvanic current was measured, and the effect of a non-uniform carbon film on corrosion behavior was investigated. As a result, in the measurement of galvanic current, the current flowed from the copper tube with a large amount of residual carbon (cathode) to the copper tube with a small amount of residual carbon (anode). In addition, the higher the area ratio of the carbon film was, the larger the galvanic current tended to be.

关键词： copper tube Residual Carbon Pitting Corrosion Cooling Water System Re-frigerator XPS

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