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논문 기본 정보

자료유형
학술저널
저자정보
이근형 (충남대학교) 송민지 (충남대학교) 강태욱 (충남대학교) 김우철 (한국지역난방공사) 김희산 (홍익대학교) 이수열 (충남대학교)
저널정보
한국부식방식학회 Corrosion Science and Technology CORROSION SCIENCE AND TECHNOLOGY Vol.23 No.4
발행연도
2024.8
수록면
315 - 323 (9page)
DOI
10.14773/cst.2024.23.4.315

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This work examined pitting corrosion failure of a copper heat-return pipe used in a district heating system. The copper pipe was corroded with a 48% reduction in thickness due to localized corrosion on the inner surface exposed to heating water of 20 ~ 40 oC. Fe and Si elements as corrosion products were found around pits. Cl element was also observed, which accelerated oxidation of copper inside pits. Cu2O deposits on the pit’s bottom surface decreased the pH inside the pit. X-ray diffraction analysis revealed hematite, cuprite, malachite and brochantite as corrosion products. Chemical analysis demonstrated that Fe and Si elements did not exist in the copper, supply water, or heating water, indicating that Fe and Si species might have entered into the pipe from the exterior. These results indicated that pits were initiated due to ion concentration gradient near Fe and Si species. Moreover, the interior of pits had lower pH due to Cl- concentration and Cu2O reactions, which accelerated the pit’s growth and led to formation of pinholes. Additionally, we confirmed that the type of pitting corrosion was a complex combination of types I and II based on the HCO3-/SO42- ratio, pH, temperature, and corrosion products.

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