Effect of copper on active dissolution and pitting corrosion of 25% Cr duplex stainless steels

Journal Article · Thu Jan 01 04:00:00 EST 1998 · Corrosion

DOI:https://doi.org/10.5006/1.3284827· OSTI ID:644334

Garfias-Mesias, L F; Sykes, J M ^[1]

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1. Univ. of Oxford (United Kingdom). Dept. of Materials

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{sub 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{sub 3}) was not improved significantly by addition of Cu. Pitting in all environments took place preferentially in the ferrite phase.

• Sponsoring Organization: USDOE
• OSTI ID: 644334
• Journal Information: Corrosion, Journal Name: Corrosion Journal Issue: 1 Vol. 54; ISSN 0010-9312; ISSN CORRAK
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHLORIDES
COPPER
DISSOLUTION
METALLURGICAL EFFECTS
PITTING CORROSION
STAINLESS STEELS
TEMPERATURE DEPENDENCE