dc.description.abstract | In the present paper there are presented results concerning comparative
corrosion resistance of some austenitic stainless steels, with or without silicon
content. The silicon content is varying in the range of 1-5 %, in a matrix of alloyed
austenite, containing 20% Cr and 15-18%Ni and with very low carbon contents
(lower than 0,03% C). There are investigated different types of corrosion resistance:
intergranular corrosion in nitrogen media, stress corrosion resistance in chloride
media, and transpassive behaviour in sulphuric media. The tested media contained
nitrogen, as it follows: Huey test (65% HNO3,, at boiling temperature, 244 hours
maintain), and 5N HNO3 +1g/l Cr6+ (144 h, b.t.). The media contained chloride is
45% MgCl2 at boiling temperature, with a period of 1000 hours. The transpassive
behaviour is tested in 10% HSO4. The investigations were made by optic and
electronic microscope, and the corroded surfaces were examined by scanning
electron microscopy. | ro_RO |