Effect of Cr:Al Ratio on Corrosion Mechanism of Ni-Cr-Mo-Al Alloys in 3.5 wt.% NaCl Solution: Microstructure and Electrochemical and Passive Characteristics DOI Open Access
Chen Lian, Wei Xie,

Huanjie Fang

и другие.

Materials, Год журнала: 2025, Номер 18(10), С. 2177 - 2177

Опубликована: Май 8, 2025

In this study, the microstructure and electrochemical passive characteristics of NiCr25.2−xMoAlx (x = 0, 1.25, 2.5, 5 mol.%) alloys were investigated. The results show that Ni-Cr-Mo-Al with varying Cr:Al ratios both had a single FCC structure without any second precipitates, decreases in dislocation density grain size observed as Al content NiCrMoAl increased. It was found from NiCr23.95MoAl1.25 maximum radius for semicircle lowest Icorr, indicating an enhanced anti-corrosion performance (Rct: 8.08 ± 0.368 × 105 Ω cm2, Icorr: 1.05 0.003 10−7 A/cm2). it approximate connection to composition films. Denser more stable microstructures further proven by potentiostatic polarization tests Mott–Schottky experiments, showing lower current acceptor (NA: 9.79 0.4 10−20 cm−3). addition, XPS Al1.25 specimen highest Cr2O3 film’s among alloys. main component, suggesting protective influence film. present study can offer guidance application nickel-based high resistance marine environments.

Язык: Английский

Effect of Cr:Al Ratio on Corrosion Mechanism of Ni-Cr-Mo-Al Alloys in 3.5 wt.% NaCl Solution: Microstructure and Electrochemical and Passive Characteristics DOI Open Access
Chen Lian, Wei Xie,

Huanjie Fang

и другие.

Materials, Год журнала: 2025, Номер 18(10), С. 2177 - 2177

Опубликована: Май 8, 2025

In this study, the microstructure and electrochemical passive characteristics of NiCr25.2−xMoAlx (x = 0, 1.25, 2.5, 5 mol.%) alloys were investigated. The results show that Ni-Cr-Mo-Al with varying Cr:Al ratios both had a single FCC structure without any second precipitates, decreases in dislocation density grain size observed as Al content NiCrMoAl increased. It was found from NiCr23.95MoAl1.25 maximum radius for semicircle lowest Icorr, indicating an enhanced anti-corrosion performance (Rct: 8.08 ± 0.368 × 105 Ω cm2, Icorr: 1.05 0.003 10−7 A/cm2). it approximate connection to composition films. Denser more stable microstructures further proven by potentiostatic polarization tests Mott–Schottky experiments, showing lower current acceptor (NA: 9.79 0.4 10−20 cm−3). addition, XPS Al1.25 specimen highest Cr2O3 film’s among alloys. main component, suggesting protective influence film. present study can offer guidance application nickel-based high resistance marine environments.

Язык: Английский

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