MOSSBAUER STUDY OF SURFACE-FILMS ON STEELS FORMED IN PHOSPHATE ENVIRONMENTS UNDER STRESS-CORROSION CRACKING CONDITIONS

Authors
MARCHEVA J RAICHEFF R NIKOLOV S HALADZOVA T
Citation
J. Marcheva et al., MOSSBAUER STUDY OF SURFACE-FILMS ON STEELS FORMED IN PHOSPHATE ENVIRONMENTS UNDER STRESS-CORROSION CRACKING CONDITIONS, Journal of radioanalytical and nuclear chemistry, 212(5), 1996, pp. 383-398
Citations number
22
Categorie Soggetti
Chemistry Inorganic & Nuclear","Chemistry Analytical","Nuclear Sciences & Tecnology
Journal title
Journal of radioanalytical and nuclear chemistry → ACNP
ISSN journal
02365731
Volume
212
Issue
5
Year of publication
1996
Pages
383 - 398
Database
ISI
SICI code
0236-5731(1996)212:5<383:MSOSOS>2.0.ZU;2-G
Abstract
A study on the composition of the surface films and corrosion products of mild and low-alloy (2% Cr) steels in 1M NaH2PO4 under stress-corro sion cracking (SCC) conditions has been carried out using Mossbauer sp ectroscopy. At potentials in the SCC region the films formed on both s teels contain Fe-3 (PO4)(2).4H2O, Fe-3 (PO4)(2).8H(2)O and FePO4.xH(2) O. The precipitates in the solution formed under these conditions cons ist of FePO4.xH(2)O and iron(III) hydrogen phosphate [most probably Fe (H2PO4)(3).2H(2)O]. An attempt has been made to relate the surface fil m composition to SCC susceptibility.