[ 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

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

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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