염수 환경에서 Inconel 718의 국부 부식 거동
Localized Corrosion Behavior of Inconel 718 in a Chloride-Containing Aqueous Solution
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초록
Localized corrosion behavior of Ni-based Inconel 718 alloy was investigated by electrochemical anodicpolarization 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 oC for 2.5 h, Inconel 718 was age-hardened at 780 oC for 8h. The microstructure of the alloy surface was investigated by optical microscopic or scanning electronmicroscopic technique. The austenitic phase with the presence of metal carbides was observed on the surfaceof Inconel 718. Metal-carbides such as Nb-Mo and Ti-carbide with diameters of approximately 10 and3 μm, respectively, were formed in Inconel 718. Anodic polarization results revealed that localized corrosionwas observed at the interface between austenitic phase of a substrate and metal carbides. Differencein electrochemical property between a metal carbide and an austenitic substrate could provide an initiationsite for localized corrosion of Inconel 718 surface.
Abstract
Localized corrosion behavior of Ni-based Inconel 718 alloy was investigated by electrochemical anodicpolarization 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 oC for 2.5 h, Inconel 718 was age-hardened at 780 oC for 8h. The microstructure of the alloy surface was investigated by optical microscopic or scanning electronmicroscopic technique. The austenitic phase with the presence of metal carbides was observed on the surfaceof Inconel 718. Metal-carbides such as Nb-Mo and Ti-carbide with diameters of approximately 10 and3 μm, respectively, were formed in Inconel 718. Anodic polarization results revealed that localized corrosionwas observed at the interface between austenitic phase of a substrate and metal carbides. Differencein electrochemical property between a metal carbide and an austenitic substrate could provide an initiationsite for localized corrosion of Inconel 718 surface.
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