Authors:T. Peev, L. Bozadjiev, T. Stoilova, and S. Nikolov
Using Mössbauer spectroscopy, the thermal decomposition products of co-precipitated Fe/NH4/2/SO4/2.6H2O and Ni/NH4/2/SO4/2.6H2O for two hours at various temperatures in open air have been studied and identified. It has been found that NiFe2O4, formed at 900 °C and 1100 °C, has been the final product.
Authors:J. Marcheva, R. Raicheff, S. Nikolov, and Tz. Haladzova
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-corrosion cracking (SCC) conditions has been carried out using Mössbauer spectroscopy. At potentials in the SCC region the films formed on both steels contain Fe3(PO4)2.4H2O, Fe3(PO4)2.8H2O and FePO4.xH2O. The precipitates in the solution formed under these conditions consist of FePO4.xH2O and iron(III) hydrogen phosphate [most probably Fe(H2PO4)3.2H2O]. An attempt has been made to relate the surface film composition to SCC susceptibility.