CORROSION RESISTANCE IN DIFFERENT MEDIA OF HIGH-STRENGTH AUSTENITIC NITROGENOUS CHROMIUM-MANGANESE STEEL
https://doi.org/10.17073/0368-0797-2016-9-663-670
Abstract
The corrosion resistance of high-strength austenitic Cr – Ni – Mn steels alloyed by nitrogen and optionally copper was experimentally studied in comparison with chromium-nickel steels Cr18Ni9 and Cr18Ni9N using electrochemical station Zive MP2. There were received polarization curves and electrochemical parameters of general, pitting and intercrystalline corrosion in diff erent media: aqueous solutions of 3 % NaCl; (100 g/l) FeCl3·6 H2O; 0.5M H2SO4 ; 0.5M H2SO4 + + H2S blowing; 0.5M H2SO4 + 0.01M KSCN. The conditional corrosion rate was calculated. According to the results of the research it was concluded that all steels are corrosion-resistant with high resistance to the general, pitting and intercrystalline corrosion in chloride media. Cr – Ni – Mn austenitic steels, alloyed by nitrogen, especially in conjunction with nitrogen and copper, with a balanced content of nitrogen and another alloying element in the composition, even at a lower content of nickel, aren’t subject to pitting corrosion in sea water and have not only great strength but also great corrosion resistance, including acidic medium (0,5M H2SO4 ) compared to traditional steel Cr18Ni9.
Keywords
austenitic high-strength nitrogenous steel,
corrosion resistance,
pitting corrosion,
general corrosion
Supporting agencies: Russian Ministry of Education (RFMEFI57514X0071)
About the Authors
I. M. Kaputkina
National University of Science and Technology “MISIS”, Moscow
Russian Federation
Dr. Sci. (Phys.–Math.), Professor, Chief Researcher of the Chair “Metal Forming”
Russian Federation
Dr. Sci. (Phys.–Math.), Professor, Chief Researcher of the Chair “Metal Forming”
A. G. Svyazhin
National University of Science and Technology “MISIS”, Moscow
Russian Federation
Dr. Sci. (Eng.), Professor, Chief Researcher of the Chair “Metallurgy of Steel and Ferroalloys”
Russian Federation
Dr. Sci. (Eng.), Professor, Chief Researcher of the Chair “Metallurgy of Steel and Ferroalloys”
I. V. Smarygina
National University of Science and Technology “MISIS”, Moscow
Russian Federation
Cand. Sci. (Eng.), Assist. Professor of the Chair of Plastic Deformation of Special Alloys
Russian Federation
Cand. Sci. (Eng.), Assist. Professor of the Chair of Plastic Deformation of Special Alloys
T. V. Bobkov
National University of Science and Technology “MISIS”, Moscow
Russian Federation
Postgraduate
Russian Federation
Postgraduate
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Review
For citations:
Kaputkina I.M., Svyazhin A.G., Smarygina I.V., Bobkov T.V. CORROSION RESISTANCE IN DIFFERENT MEDIA OF HIGH-STRENGTH AUSTENITIC NITROGENOUS CHROMIUM-MANGANESE STEEL. Izvestiya. Ferrous Metallurgy. 2016;59(9):663-670. (In Russ.) https://doi.org/10.17073/0368-0797-2016-9-663-670
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