Sodium metaborate and metasilicate coatings protect pure iron in the temperature range 800 to 1,000°C. Metaborate and metasilicate inhibit oxidation. Protective vonsenite (4FeO x Fe2O3 x B2O3) forms with metaborate, and protective fayalite (2FeO x SiO2) forms with metasilicate. It is proposed that noncoherent blocking layers of these compounds effectively decrease the interface area for iron ion diffusion.

Subject
X-ray diffraction, Oxidation kinetics, Coatings, Probes, Iron, Melting, Pores, Oxide scales, Interfaces, Sodium, Scale formation, Scale, Oxidation
Keywords:
inorganic coatings, oxidation, protection
NACE International
1993
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