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Inhibiting effect of octadecylamine on pitting corrosion behaviour of stainless steel type 1.4541 up to 250 °C
Author(s) -
Bäßler R.,
Uhlemann M.,
Mummert K.
Publication year - 1999
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/(sici)1521-4176(199903)50:3<146::aid-maco146>3.0.co;2-g
Subject(s) - dielectric spectroscopy , chemistry , corrosion , metallurgy , chloride , oxide , nuclear chemistry , materials science , electrochemistry , electrode
The inhibiting effect of octadecyclamine (ODA) on chloride induced localized corrosion of austenitic stainless steel type 1.4541 (AISI 321) is described at temperatures from 150 °C and 250 °C indeaerated aqueous solutions with chloride concentrations up to 10 ‐ 1 M. Results of electrochemical (current‐potentiAl‐curves, impedance spectroscopy) as well as corrosion tests on mechanical loaded samples (constant extension rate test), and surface analytical characterization (Auger electron spectroscopy) showed the inhibiting effect of ODA. The increase of the corrosion resistance of the investigated material is interpreted by an ODA‐film on steel surface as a diffusion barrier, and the formation of a compact hot‐water oxide layer, caused by the increase of pH resulted from ODA‐cracking and dissociation.