Meanwhile, Cr(OH) 3 has a significantly smaller standard free energy [ 57 ], so it forms first on the surface of the passive film (reaction (7)), and Cr(OH) 3 subsequently occurs in reactions 8 and 9, producing CrO 4 2− and Cr 2 O 3 . (7) 4 Cr 3+ + 3 O 2 + 6 H 2 O + 12 e − → 4 Cr(OH) 3 (8) Cr(OH) 3 + 5 OH − → CrO 4 2− + 4 H 2 O + 3 e − (9) 4 Cr(OH) 3 + 4 Cr + 3 O 2 → 4 Cr 2 O 3 +6H 2 O The values of Cr 2 O 3 to Cr(OH) 3 ( Figure 10 a), Fe OX 3+ to Fe OX 2+ ( Figure 11 b), and Mo ions/Mo ( Figure 11 c) exhibited an increasing trend as the Mo content increased and the Cr content decreased.
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Studies on the Cooperative Influence of Cr and Mo on the Pitting Corrosion Resistance of Super Austenitic Stainless Steels.
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