The Corrosion Resistance of Nitrogen Bearing Martensitic Stainless Steels
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概要
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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 H<SUB>2</SUB>SO<SUB>4</SUB> 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 Na<SUB>2</SUB>SO<SUB>4</SUB>, 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 H<SUB>2</SUB>SO<SUB>4</SUB>, and the pitting potentials were higher, in the 0.01 M NaCl+0.01 M Na<SUB>2</SUB>SO<SUB>4</SUB> solution. The results are discussed basically throuth the different chemical composition of the steels and the microstructure observed in each sample.
- 社団法人 日本鉄鋼協会の論文
- 1996-07-15
著者
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Ono Alberto
Department Of Metallurgy And Materials Engineering University Of Sao Paulo
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ALONSO Neusa
Department of Metallurgy and Materials Engineering, University of Sao Paulo
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TSCHIPTSCHIN Andre
Department of Metallurgy and Materials Engineering, University of Sao Paulo
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Alonso Neusa
Department Of Metallurgy And Materials Engineering University Of Sao Paulo
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Tschiptschin Andre
Department Of Metallurgy And Materials Engineering University Of Sao Paulo