Study of Localized Corrosion Susceptibility of Ni-Based Superalloys Employing Electrochemical Noise Technique.
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| Title: | Study of Localized Corrosion Susceptibility of Ni-Based Superalloys Employing Electrochemical Noise Technique. |
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| Authors: | Almeraya-Calderon, Facundo1 (AUTHOR), Huerta-Zavala, Miguel Sergio1,2 (AUTHOR), Maldonado-Bandala, Erick2,3 (AUTHOR), Nieves-Mendoza, Demetrio2,4 (AUTHOR), Jaquez-Muñoz, Jesus Manuel3,5 (AUTHOR), Baltazar-Zamora, Miguel Angel1,2 (AUTHOR), Landa-Ruiz, Laura2 (AUTHOR), Estupinan-Lopez, Francisco1,3 (AUTHOR), Olguin-Coca, Javier4 (AUTHOR), Flores-De los Rios, Juan Pablo5 (AUTHOR), Gaona-Tiburcio, Citlalli1 (AUTHOR) citlalli.gaonatbr@uanl.edu.mx |
| Source: | Materials (1996-1944). Jun2026, Vol. 19 Issue 11, p2424. 24p. |
| Subjects: | Pitting corrosion, Inconel, Corrosion & anti-corrosives, Nickel-chromium alloys, Seawater corrosion |
| Abstract: | Inconel superalloys are employed in demanding components of different equipment. However, they can be exposed to atmospheric corrosion systems, such as marine and industrial environments. This research is focused on studying the localized corrosion susceptibility of Inconel 600, 690 and 718 exposed to H2SO4, 1 wt.% and 3.5 wt. % NaCl solutions, simulating marine and industrial atmospheres at 25 ± 0.5 °C. Localized corrosion behavior was characterized by electrochemical noise (EN) and cyclic potentiodynamic polarization (CPP) curves according to ASTM 6-199 ASTM G61 standards. The EN technique was analyzed through time series and analysis for chaotic systems, such as Hurst, Lyapunov and Husdorff coefficients, to determine the corrosion type of each system to reduce the uncertainty in common statistical analysis. The EN results show how Inconel superalloys tend to present localized attacks, being more notorious in NaCl. The application of specialized methods such as Hurst and Lyapunov helped to determine the corrosion system when alloys were characterized by EN. The results indicated that all superalloys exhibit positive hysteresis under CPP, indicating susceptibility to localized pitting corrosion. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | Inconel superalloys are employed in demanding components of different equipment. However, they can be exposed to atmospheric corrosion systems, such as marine and industrial environments. This research is focused on studying the localized corrosion susceptibility of Inconel 600, 690 and 718 exposed to H2SO4, 1 wt.% and 3.5 wt. % NaCl solutions, simulating marine and industrial atmospheres at 25 ± 0.5 °C. Localized corrosion behavior was characterized by electrochemical noise (EN) and cyclic potentiodynamic polarization (CPP) curves according to ASTM 6-199 ASTM G61 standards. The EN technique was analyzed through time series and analysis for chaotic systems, such as Hurst, Lyapunov and Husdorff coefficients, to determine the corrosion type of each system to reduce the uncertainty in common statistical analysis. The EN results show how Inconel superalloys tend to present localized attacks, being more notorious in NaCl. The application of specialized methods such as Hurst and Lyapunov helped to determine the corrosion system when alloys were characterized by EN. The results indicated that all superalloys exhibit positive hysteresis under CPP, indicating susceptibility to localized pitting corrosion. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 19961944 |
| DOI: | 10.3390/ma19112424 |
