ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
The Corrosion Resistance of Nitrogen Bearing Martensitic Stainless Steels
Alberto Akikazu OnoNeusa AlonsoAndre Paulo Tschiptschin
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1996 Volume 36 Issue 7 Pages 813-817

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Abstract

It has been mentioned that nitrogen enhances the corrosion resistance of the martensitic stainless steels. In this work, by means of electrochemical and mass loss tests, the corrosion resistance of three experimental martensitic stainless steels, with partial substitution of carbon by nitrogen were investigated. Martensitic stainless steels type AISI 410 and AISI 420 were also tested, for comparison, and all steels were tested in both hardened and tempered conditions.
The resistance to general corrosion in 0.5 M H2SO4 was evaluated by mass loss tests and by potentiodynamic polarization tests, the last through the critical current density and the passive current density. The resistance to pitting corrosion was evaluated by potentiodynamic polarization tests in 0.01 M NaCl+0.01 M Na2SO4, through the pitting potential.
The results of both general corrosion and pitting corrosion tests show that the nitrogen, when present in the solid solution condition, improves the corrosion resistance. It was observed that with the partial substitution of carbon by nitrogen, the passive current densities were lower, in 0.5 M H2SO4, and the pitting potentials were higher, in the 0.01 M NaCl+0.01 M Na2SO4 solution.
The results are discussed basically throuth the different chemical composition of the steels and the microstructure observed in each sample.

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