Abstract
The effect of partial replacement of nickel with nitrogen on the mechanism of localized corrosion resistance and repassivation for nitrogen-bearing stainless steel was investigated using anodic potentiodynamic polarization technique. The solutions used for this study contained 0.0, 0.05 and 0.33 M Fe3+ for solutions I, II and III, respectively, in a total Cl− ion concentration 1 M. The pitting attack was found to be retarded by nitrogen addition and the samples were able to passivate as the nitrogen increase. Addition of nitrogen allows the decrease in the wt.% of Ni, but to a certain limit. Nitrogen is adsorbed on the interface of the metal oxide and results in the repulsion of Cl− ions. Moreover, it reacts with H+ ions in the solution leading to higher pH, which explains the retardation effect of nitrogen to corrosion.
Highlights
Nitrogen is considered as an important alloying addition to austenitic stainless steel in terms of corrosion resistance
The aim of this paper is to study the effect of partial replacement of nickel with nitrogen on the corrosion behavior of newly designed austenitic stainless steel samples without and with heat treated
Experiments were designed to investigate the role of partial replacement of nickel by nitrogen on the corrosion behavior of austenitic stainless steel
Summary
Nitrogen is considered as an important alloying addition to austenitic stainless steel in terms of corrosion resistance. It promotes passivity, widens the passive range in which pitting is less probable, improves stress corrosion cracking resistance in some media, and enhances the resistance to general and intergranular corrosion Nitrogen dissolved in austenitic stainless steel was found to increase its strength(Osozawa, Okato, Fukase, Yokota & Boshoku-Gijyutsu, 1975. The aim of this paper is to study the effect of partial replacement of nickel with nitrogen on the corrosion behavior of newly designed austenitic stainless steel samples without and with heat treated
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