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High Temperature Corrosion of the Alloy Ni 4 Mo in a hydrogen chloride atmosphere
Author(s) -
Ruedl E.,
De Asmundis C.,
CoenPorisini F.
Publication year - 1977
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.19770281205
Subject(s) - alloy , corrosion , gravimetric analysis , chloride , atmosphere (unit) , materials science , impurity , hydrogen , metallurgy , volatilisation , halide , hydrogen chloride , layer (electronics) , high temperature corrosion , oxygen , inorganic chemistry , chemistry , composite material , organic chemistry , physics , thermodynamics
Specimens of the alloy Ni 4 Mo were tested in a hydrogen chloride atmosphere at temperatures between 400° – 850° C. The corrosion of the alloy was followed by gravimetric analyses and microstructural examinations. It was found that the layer formed on the specimens due to corrosion is adherent but porous, thus allowing the volatilization of some of the corrosion products. The formation of various kinds of oxides and chlorides was observed. The exact composition of the scale depended on the temperature of exposure to hydrogen chloride and on the amount of oxygen present as an impurity in the test apparatus. The formation of a domain structure in the uncorroded alloy affects the morphology of the scale/alloy interface.