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Polarization resistance measurements in alkali metal sulphate melts
Author(s) -
Balajka J.
Publication year - 1973
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.19730241105
Subject(s) - corrosion , polarization (electrochemistry) , partial pressure , materials science , alkali metal , metal , thermal decomposition , analytical chemistry (journal) , inorganic chemistry , chemistry , metallurgy , oxygen , chromatography , organic chemistry
Measurement of the polarization resistance of Fe, Ni, 8% Cr stell and CrNi stell 18 8 reveals that the corrosion rate increase as the SO 3 partial pressure in the gas phase is increased. While a protective layer appears to be formed in alloyed steel in neutral melts (a fact which is reflected in an increase of the polarization resistance) no such layer can be identified on Fe and Ni. Addition of NiSO 4 to the SO 3 partial pressure; this effect is probably due to a thermal decomposition of a salt. The exact correlation of weight loss and polarization resistance requires, however, more detailed investigation.