[논문]염수 환경에서 Inconel 718의 국부 부식 거동

이준섭; 이예진; 권순일; 신정호; 이재현

doi:10.14773/cst.2021.20.6.361

[국내논문] 염수 환경에서 Inconel 718의 국부 부식 거동
Localized Corrosion Behavior of Inconel 718 in a Chloride-Containing Aqueous Solution 원문보기

Corrosion science and technology, v.20 no.6, 2021년, pp.361 - 366

이준섭 (국립창원대학교 신소재공학부) , 이예진 (국립창원대학교 소재융합시스템공학과) , 권순일 (세아창원특수강 기술연구소) , 신정호 (세아창원특수강 기술연구소) , 이재현 (국립창원대학교 신소재공학부)

Abstract ▼ AI-Helper

Localized corrosion behavior of Ni-based Inconel 718 alloy was investigated by electrochemical anodic polarization techniques in NACE TM 0177 A solution of 5 wt% NaCl + 0.5 wt% acetic acid at room temperature. After the solution heat treated at 1080 ℃ for 2.5 h, Inconel 718 was age-hardened at 780 ℃ for 8 h. The microstructure of the alloy surface was investigated by optical microscopic or scanning electron microscopic technique. The austenitic phase with the presence of metal carbides was observed on the surface of Inconel 718. Metal-carbides such as Nb-Mo and Ti-carbide with diameters of approximately 10 and 3 ㎛, respectively, were formed in Inconel 718. Anodic polarization results revealed that localized corrosion was observed at the interface between austenitic phase of a substrate and metal carbides. Difference in electrochemical property between a metal carbide and an austenitic substrate could provide an initiation site for localized corrosion of Inconel 718 surface.

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표/그림 (9)

그림 Fig. 1. Optical microscopic image of Inconel 718
표 Table 1. Chemical compositions of Inconel 718
그림 Fig. 2. Frequency distribution for particle sizes observed in Inconel 718 surface
그림 Fig. 3. SEM back-scattered electron and EDS elemental mapping images of Inconel 718 surface
그림 Fig. 4. Electrode potential transient of Inconel 718 electrode in 5 wt% NaCl + 0.5 wt% acetic acid for 3600 s
그림 Fig. 5. Potentiodynamic polarization curve of Inconel 718 electrode in 5 wt% NaCl + 0.5 wt% acetic acid for 3600 s
그림 Fig. 6. Double logarithmic plot of current density of Inconel 718 electrode and time during potentiostatic polarization at 0.5 V_SSE for 3600 s in 5 wt% NaCl + 0.5 wt% acetic acid
그림 Fig. 7. Secondary electron and elemental mapping images of Inconel 718 surface after the potentiostatic polarization at 0.5 V_SSE for 3600 s in 5 wt% NaCl + 0.5 wt% acetic acid
그림 Fig. 8. Expanded secondary electron image of MC in Fig. 7 of Inconel 718 surface after the potentiostatic polarization at 0.5 V_SSE for 3600 s in 5 wt% NaCl + 0.5 wt% acetic acid

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