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The aim of this research project was to study the effect of nitrogen on the corrosion of high nitrogen steels (HNS) in comparison to materials with similar composition without nitrogen or with lower nitrogen contents. In addition model alloys (Fe-N, Fe-Ni-N and Fe-Ni-Mo-N alloys) were investigated to separate the effect of nitrogen on the corrosion kinetics from the effect of other alloying elements. The corrosion behaviour of the model alloys was tested in Na(2)SO(4)/H(2)SO(4) solutions of various pH. The active dissolution of the nitrogen-containing alloys in acidic electrolytes was found to be accelerated in comparison to nitrogen free alloys. The pitting corrosion resistance is enhanced by nitrogen addition. The presence of nitrogen markedly decreases the extend of pitting and prolongs the incubation time before start of pitting. The corrosion behaviour of commercial austenitic steels was compared with corresponding high nitrogen steels.

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Authors: STRATMANN M, Institut Werkstoffwissenschaften, Universität Erlangen-Nürnberg (DE);REYNDERS B, Institut Werkstoffwissenschaften, Universität Erlangen-Nürnberg (DE);GRABKE H, Institut Werkstoffwissenschaften, Universität Erlangen-Nürnberg (DE)
Bibliographic Reference: EUR 16659 EN (1997) 38pp., FS, ECU 7.00
Availability: Available from the (2)
ISBN: ISBN 92-828-0333-3
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