Enhancing Corrosion Resistance of Carbidic and Austempered Carbidic Ductile Iron in Chloride Solutions via Sodium Tungstate Addition | ||
| Egyptian Journal of Chemistry | ||
| Volume 68, Issue 11, November 2025, Pages 201-215 PDF (639.39 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejchem.2025.353759.11184 | ||
| Authors | ||
| Aliaa Abdelfatah1; Lamiaa Z Mohamed* 2; Hayam A. Aly3 | ||
| 1Metallurgical Dept, Faculty of Engineering, Cairo University | ||
| 2Mining, Petroleium, Metallurgical Engineering Dept., Faculty of Engineering, Cairo Univerrsity | ||
| 3Metal casting lab, Central Metallurgical Research and Development Institute (CMRDI), P.O. Box 11421, Helwan, Egypt | ||
| Abstract | ||
| This study investigates the corrosion behavior and surface morphology of carbidic ductile iron (CDI) and carbidic austempered ductile iron (CADI) in 3.5% NaCl, focusing on the effects of heat treatments at 275°C and 375°C and alloying with Nb (0 and 1 wt.%) and Cr (1 and 1.5 wt.%). The corrosion characteristics were evaluated with and without the addition of Na₂WO₄ as an inhibitor (0.1 g and 0.2 g). At 275°C, the 1Cr-Nb alloy exhibited the lowest corrosion rate (CR) of 0.003 mm/y in 3.5% NaCl without inhibition, which further decreased to 0.001 mm/y with the addition of 0.2 g Na₂WO₄. The surface morphology of the corroded alloys reflected their corrosion behavior, revealing evidence of uniform corrosion, localized pitting, and galvanic corrosion. These findings highlight the influence of heat treatment, alloying elements, and inhibition on the corrosion resistance of CDI and CADI in saline environments. | ||
| Keywords | ||
| Corrosion behavior; Sodium tungstate inhibitor; Carbidic ductile iron; Carbidic austempered ductile iron; Microstructure | ||
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