Structural factors determining the inhibitive effect of alkyl(aryl)ammonium salts of functionalized perfluoropolyethers

Thirty homologous series of functionalized perfluoropolyethers (FP) based on alkyl(aryl)ammonium salts were studied, by correlation analysis and statistical data processing, as inhibiting constitutents of perfluoropolyether lubricating greases. The basic adsorption and colloid-chemical factors respo...

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Bibliographic Details
Published in:Protection of metals 2000-01, Vol.36 (1), p.31-39
Main Author: Melnikov, V G
Format: Article
Language:English
Subjects:
Aliphatic compounds
Anchors
Anions
Cations
Filled plastics
Fragments
Hydrophobicity
Surface chemistry
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Summary:Thirty homologous series of functionalized perfluoropolyethers (FP) based on alkyl(aryl)ammonium salts were studied, by correlation analysis and statistical data processing, as inhibiting constitutents of perfluoropolyether lubricating greases. The basic adsorption and colloid-chemical factors responsible for the inhibitive effect of FPs are the high critical micell concentration, surface activity, hydrphobicity, and formation of chemoadsorption complexes, in which FPs function as electron-donating agents. Contributions from ten basic structural factors of FPs (carboxylate and arylsulfonate anions, electronic structure of an anchor heteroatom, active hydrogen atoms of NH- and OH-acids in aliphatic and aromatic fragments, aliphatic radicals, aromatic fragment in an alkylammonium cation, etc.), influencing their inhibitive effect in low-polarity media, were quantitatively estimated. The aim of this work is to study how the structure of FPs based on alkyl(aryl)ammonium salts influences the degree and the mechanism of the inhibition of atmospheric corrosion of steel.
ISSN:0033-1732
1608-327X
DOI:10.1007/BF02766736