Synergistic inhibition of zinc corrosion in 0.5 M NaCl by combination of cerium(III) chloride and sodium silicate
2002; Elsevier BV; Volume: 44; Issue: 4 Linguagem: Inglês
10.1016/s0010-938x(01)00087-7
ISSN1879-0496
Autores Tópico(s)Water Treatment and Disinfection
ResumoThe synergistic inhibition effects of cerium(III) chloride, CeCl3 and sodium silicate, Na2Si2O5 (water glass) on corrosion of zinc in an aerated 0.5 M NaCl solution at 30°C were examined by polarization measurements. Equimolar mixtures of these inhibitors were markedly effective, indicating that the inhibition efficiencies of the mixture at 1×10−4 of each inhibitor were 95.9 and 93.6 after immersion of a zinc electrode in the solution for 3 and 120 h, respectively. X-ray photoelectron spectra revealed that a protective layer composed of hydroxylated or hydrated cerium-rich oxide and small amounts of zinc hydroxide and silicate formed on the zinc surface. A high inhibition efficiency of 1×10−3 M Na2Si2O5, 97.7% was obtained for corrosion of a zinc electrode which was previously treated in the NaCl solution of 1×10−3 M CeCl3 at 30°C for 30 min.
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