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Electrochemical studies were made of the influence of Cu on pitting behavior and active dissolution of 25% Cr duplex stainless steels (DSS) in chloride-containing neutral and acid solutions. Alloys with increased Cu content showed higher pitting potentials (E p ) in 1 M hydrochloric acid (HCl) and 3.5% sodium chloride (NaCl) solutions. In HCl, the current density in the active state also was lower for the Cu-containing alloys. However, the critical pitting temperature (CPT) in ferric chloride (FeCl 3 ) was not improved significantly by addition of Cu. Pitting in all environments took place preferentially in the ferrite phase. FIGURE 4. Comparison of polarization curves for high-Cu and low-Cu DSS in 1 M HCl at 65°C.FIGURE 5. Comparison of polarization curves for high-Cu, low-Cu, and nil-Cu DSS in 1 M HCl at 70°C.FIGURE 6. Comparison of polarization curves for high-Cu and low-Cu DSS in 3.5% NaCl at 65°C.FIGURE 7. Comparison of polarization curves for high-Cu, low-Cu, and nil-Cu DSS in 3.5% NaCl at 70°C.

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