| Rapid Assessment Of Corrosion Susceptibility Of Mild Steel In Simulated Splash Zone Condition Vishwanath Kalikivayi1; Kallol Mondal2; Sudhanshu Shekhar Singh3; 1INDIAN INSTITUTE OF TECHNOLOGY KANPUR, Kanpur, India; 2IIT KANPUR, Kanpur, India; 3INDIAN INSTITUTE OF TECHNOLOGY (IIT), KANPUR, KANPUR, India; PAPER: 202/Corrosion/Regular (Oral) SCHEDULED: 11:30/Tue. 29 Nov. 2022/Andaman 2 ABSTRACT: Mild steels or their derivative steels in the carbon range of 0.1-0.25%C are used in almost all the common engineering applications, such as construction, bridges, household, agriculture, etc. On the other hand, constructions in off-shore or river always experience hostile environment leading to severe corrosion of the steel structures as well as reinforced bars embedded in concrete structures [1]. Therefore, quick assessment of corrosion in laboratory scale is extremely important in order to facilitate the selection of suitable materials for varied corrosion environments in off-shore area [2, 3]. Hence, the present work concentrates on the quick evaluation of corrosion of a normalized mild steel under the influence of water line change due to wave as well as natural evaporation. A novel simulated marine environment device has been developed to evaluate the corrosion behavior in various marine zones (atmosphere zone, splash zone, and immersion zone). The Raman spectroscopic analysis of the corrosion products, formed at various zones, has revealed the formation of α-FeOOH, γ-FeOOH, β-FeOOH and Fe2O3 in a unique way. The morphologies of the corrosion product formed in various zones, as characterized by scanning electron microscope (SEM), show that the corroded region of the splash zone contains cracks and porous rust layer in comparison to that of the other regions, indicating instability of the corrosion products. Moreover, the thickness of the corrosion product layer is more in the splash zone in comparison to that of the other zones due to cyclic wetting and drying. In addition, open circuit potential (OCP) and linear polarization (LP) measurements, conducted on the corroded surface of various zones without the removal of the rust layer, suggest strong relationship of rust layer composition and phase fraction with OCP and LP. References: 1. R. Jeffrey, R. E. Melchers, Corrosion Science, 51(10) (2009) 2291-2297. 2. J. Wu, K. Pang, D. Peng. Wu, Y. Bao, X. Li, Int. J. Electrochem. Science 12(2017) 1216-1231. 3. S. Choudhary, A. Garg, K. Mondal, Journal of Materials Engineering and Performance 25(7) (2016) 2969-2976. |
