[ Article ]

Journal of the Korean Society of Manufacturing Technology Engineers - Vol. 33, No. 2, pp.85-91

ISSN: 2508-5107 (Online)

Print publication date 15 Apr 2024

Received 27 Dec 2023 Revised 27 Mar 2024 Accepted 04 Apr 2024

DOI: https://doi.org/10.7735/ksmte.2024.33.2.85

Pump Casing 부식 손상원인 분석

황령경^a^{, *} ; 황선중^a ; 윤성태^b ; 이관영^c

Analysis of Causes of Corrosion Damage in Pump Casing

Hwang, Ryung-kyung^a^{, *} ; Hwang, Sun-joong^a ; Yoon, Seong-tae^b ; Lee, Kwan-young^c

aManagement, Dongnam Special Cast Steel co., Ltd
bDepartment of Nano Convergence Engineering, Inje University
cDepartment of Mold and Materials Engineering, Inje University

Correspondence to: ^*Tel.: +82-55-551-9200 E-mail address: bring1103@naver.com (Hwang ryung-kyung).

Abstract

In this study, we attempted to determine the cause of corrosion that occurred after three days of using a pump casing cast from 20Cr steel. The damaged pump casing contained a Cr-carbide structure in its martensite matrix. This occurred in martensite with a low Cr content owing to differences in the corrosion properties of the martensite structure and Cr-carbide, and the pump casing was damaged by corrosive environments such as seawater and sulfur (corrosive substances). In seawater, corrosion by sulfur (S), a corrosive substance, is relatively weak, and it is believed that selective corrosion and crevice corrosion damage occur in the martensite matrix, which has a lower Cr content than Cr-carbide. Considering that the corrosion started at the interface between the Cr-carbide and martensite and progressed rapidly over a short period of time, it appears that the damage was caused by electrical corrosion.

Keywords:

Corrosion damage, Pump casing, Electrolytic corrosion, Cr special steel, Martensitic matrix

References

Lee, H. Y., 1995, Corrosion of Metals, YeonKyeong Publishing Co., Republic of Korea.
Chang, H. K., 1973, Review on Pitting Corrosion of Steels in Chloride Solution, Journal of the Corrosion Science Society of Korea, 2:4 153-160.
Lin, T., Guo, Y., Wang, Z., Shao, H., Lu, H., Li, F., He, X., 2018, Effects of Chromium and Carbon Content on Microstructure and Properties of TiC-steel Composites, Int. J. Refract. Met. Hard Mat., 72 228-235. [https://doi.org/10.1016/j.ijrmhm.2017.12.037]
Mourlas, A., Pavlidou, E., Vourlias, G., Rodríguez, J., Psyllaki, P., 2019, Concenterated Solar Energy for In-situ Elaboration of Wear-Resistant Composite Layers. Part Ⅰ: TiCand Chromium Carbide Surface Enrichment of Common Steels, Surf. Coat. Technol., 377 124882. [https://doi.org/10.1016/j.surfcoat.2019.08.011]
Orečný, M., Buršák, M., Šebek, M., Falat, L., 2016, Influence of Hardness, Matrix and Carbides in Combination with Nitridation on Abrasive Wear Resistance of X210Cr12 Tool Steel, Metals, 6:10 236. [https://doi.org/10.3390/met6100236]
Trujillo, A. P., Thurman, H. V., 2007, Essentials of Oceanography, Prentice-Hall, Prentice Hall, Boston, MA.
Cramer, S. D., Covino, Jr. B. S., 2008, ASM Handbook Volume 13B: Corrosion: Materials, ASM International, USA.
Davis, J. R., 1995, ASM Specialty Handbook-Stainless Steels, ASM International, Materials Park, OH.
Nalco, and Ecolab company, 2015, The Nalco Guide to Cooling Water Systems Failure Analysis, McGraw-Hill Education, New York, NY.

Ryung-kyung Hwang

Managing Director, Dongnam special cast steel co., Ltd. Her research interest is Metal Materials and Casting.

E-mail: bring1103@naver.com

Sun-joong Hwang

Executive Director, Dongnam special cast steel co., Ltd. His research interest is Metal Materials and Casting.

E-mail: sjhwang84@naver.com

Seong-tae Yoon

Ph.D. Graduate Student, Department of Nano-Convergence Engineering, Inje University. His research interest is Aerospace Materials and Molds.

E-mail: styun@airkpc.com

Kwan-young Lee

Professor, Department of Mold and Materials Engineering, Inje University. His research interest is Heat/Surface Treatment and Development of New Materials to Maximize the Life of Mold Materials.

E-mail: heleegy@inje.ac.kr