Inhibiting effect of octadecylamine on pitting corrosion behaviour of stainless steel type 1.4541 up to 250 degrees C

Authors
Bassler, R Uhlemann, M Mummert, K
Citation
R. Bassler et al., Inhibiting effect of octadecylamine on pitting corrosion behaviour of stainless steel type 1.4541 up to 250 degrees C, MATER CORRO, 50(3), 1999, pp. 146-153
Citations number
36
Categorie Soggetti
Material Science & Engineering
Journal title
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
ISSN journal
09475117 → ACNP
Volume
50
Issue
3
Year of publication
1999
Pages
146 - 153
Database
ISI
SICI code
0947-5117(199903)50:3<146:IEOOOP>2.0.ZU;2-T
Abstract
The inhibiting effect of octadecyclamine (ODA) on chloride induced localize d corrosion of austenitic stainless steel type 1.4541 (AISI 321) is describ ed at temperatures from 150 degrees C and 250 degrees C in deaerated aqueou s solutions with chloride concentrations up to 10(-1) M. Results of electro chemical (current-potential-curves, impedance spectroscopy) as well as corr osion tests on mechanical loaded samples (constant extension rate test), an d surface analytical characterization (Auger electron spectroscopy) showed the inhibiting effect of ODA. The increase of the corrosion resistance of t he 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.