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Effect of rare earth metals and the stability of sulfide inclusions on Localized corrosion of low alloy steels
Author(s) -
Szummer A.,
JanikCzachor M.
Publication year - 1982
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.19820330306
Subject(s) - electron microprobe , passivation , sulfide , corrosion , metallurgy , alloy , rare earth , materials science , iron sulfide , rare earth element , sulfur , composite material , layer (electronics)
Effect of alloying with rare earth elements RE (La, Pd + Nd, or so called “Mischmetall” containing Ce, Pr, Nd, La and traces of the other RE) on the ability to passivate and susceptibility to chloride breakdown of low alloys steels was investigated. Electron microprobe analysis revealed that the effect of RE depends upon the element and is connected with a modification of the composition and morphology of MnS inclusions present within the steels without RE addition. La seems to be most detrimental. The nonstability of La sulfide inclusions in air results in their spontaneous oxidation and growth into fantastic “flower‐like” forms which facilitates the formation of corrosion pits.