An in situ identification of the films formed on 304 stainless steel, Fe-13Cr-10Ni, Fe-5Cr-10Ni, and iron in 288 °C water containing dilute concentrations of sulfuric acid and sodium sulfate were examined. Similarly, In situ identification of the films formed on Alloy 600 in 288 °C water containing 2ppm Li and 1200ppm B were conducted. Both sulfuric acid and sodium sulfate solutions up to conductivities of 4.545 μS/cm were examined in the BWR solution. There was no difference in the characteristic oxides that formed on the iron based alloys in a high purity solution compared to the sulfate solutions. On these alloys, M3O4 formed in low dissolved oxygen solutions while a M2O3 film formed in high dissolved oxygen, similar to what has been observed in high purity water. Alloy 600 in the PWR experiments was polarized below an electrochemical potential region where stress corrosion cracking (SCC) occurs. Alloy 600 was also polarized into this SCC region and above this region. No films grew on Inconel 600 at potentials below the SCC potential region. A chromium/nickel M3O4 oxide formed on Alloy 600 in the SCC region, while a NiO formed as the potential was increased immediately above the region of SCC susceptibility. Films of (Fe,Cr)2O3 and Ni3-xFexO4 formed at higher potentials.

Subject
Water, Intergranular stress corrosion cracking, Sulfuric acid, Nickel based alloys, Oxide formation, Sulfates, Oxide films, Film formation, Oxygen, Stainless steel, Alloys, Corrosion potential, Stress corrosion cracking
Keywords:
Oxidation, Raman Spectroscopy, SERS, Stainless steel, Passive Film, Alloy 600
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2004
Association for Materials Protection and Performance (AMPP)
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