Abstract
The effect of partial replacement of nickel with nitrogen on the corrosion resistance of newly designed austenitic stainless steel samples without and with heat treated was investigated in 3.5wt% and 5wt% NaCl solution using open-circuit, potentiodynamic, cyclic anodic polarization and electrochemical impedance spectroscopy techniques. The results showed that, passivation in sample 1 where the highest addition of nickel and low addition of nitrogen is different from that for sample 4 where the nitrogen is greatest and the nickel is reduced almost to the third comparing sample 1. The difference in responses of heat treated samples to localized and general corrosion could be attributed to the difference in their phase compositions. The appearance of ferrite phase for samples (2, 4, 5 and 6) after heat treatment resulted in lowering the general and localized corrosion resistance than as forged samples in contrast with samples 1 and 3, where they still pure austenite. The obtained results are confirmed by surface examination.
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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