Development of Austenitic Stainless Steel Alloy with Sn addition for Improved Corrosion Resistance Properties

Project: Research

Project Details

Description

Stainless steel and Ni base alloys are widely used in different industrial applications due to their excellent corrosion resistance and mechanical properties. Along with Ni and Cr, many other alloying elements such as Si, Cu, Mn, Sn, Mo, and W etc. are used depending on final application requirements. In spite of the high thermodynamic reactivity of metals, what makes our metals-based civilization possible is the phenomenon of passivity. Passivity infers kinetic stability of reactive metals and alloys in contact with oxidizing aqueous environments, when thermodynamics indicates a large driving force (negative change in the Gibbs free energy) for the reaction of the metal with oxygen (either from O2 or H2O). The observed kinetic stability is due to the formation of a passive reaction product film on the surface that effectively isolates the reactive metal from the corrosive environment. Different alloying additions in stainless steel alloys affect the structure and composition of their thin oxide film differently, so understanding the role of individual alloying elements on the passive film composition and localized corrosion is very important, in order to design and develop new corrosion resistant alloys for the industry. This proposed research is related with the development of austenitic stainless steel alloys with controlled tin (Sn) additions, for improved corrosion resistance properties. The understanding that how the addition of Sn in austenitic stainless steel alloys will affect their structural morphology and corrosion properties will be helpful for designing better corrosion resistance stainless steels. There are not many studies showing the independent effect of Sn on the localized corrosion resistance and its contribution towards passivity in such alloys. So therefore, in this proposed research work, Fe-18Cr-9Ni-xSn cast austenitic alloys will be developed to investigate in depth the independent effect of Sn on the corrosion behavior and passivity of these alloys.
StatusFinished
Effective start/end date1/09/201/09/22

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