Pitting corrosion behavior of type 904L stainless steel in sodium bromide solutions

Journal Article · Fri Aug 01 04:00:00 EDT 1997 · Corrosion

DOI:https://doi.org/10.5006/1.3290295· OSTI ID:532999

Abd El Meguid, E A ^[1]

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1. National Research Centre, Cairo (Egypt). Dept. of Electrochemistry and Corrosion

Potentiodynamic cyclic anodic polarization, scanning electron microscopy, and energy dispersive x-ray techniques were used to study pitting corrosion behavior of type 904L (UNS N08904) stainless steel in aerated or argon-deaerated 0.6 M sodium bromide solutions at 25 C. Type 904L SS was shown to undergo pitting corrosion even though the steel has a high molybdenum content (4.5% Mo). Effects of temperature, air, pH, bromide ion concentration (C{sub Br}{sup {minus}}), and bromide/chloride ratio on pitting corrosion were studied. The critical pitting potential (E{sub pit}) was found to decrease with increasing temperature and C{sub Br}{sup {minus}}. Changing the pH of the 0.6 M NaBr solution did not affect E{sub pit} from pH 2 to 11. At pH {ge} 12, pitting corrosion was prevented. Addition of chloride ions to bromide at a fixed halide concentration of 0.6 M inhibited pitting corrosion attack. Morphology of the pits produced was inspected by SEM after anodic polarization treatment in different bromide solutions.

• Sponsoring Organization: USDOE
• OSTI ID: 532999
• Journal Information: Corrosion, Journal Name: Corrosion Journal Issue: 8 Vol. 53; ISSN 0010-9312; ISSN CORRAK
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHEMICAL PLANTS
CHLORIDES
CORROSIVE EFFECTS
HEAT EXCHANGERS
PARAMETRIC ANALYSIS
PITTING CORROSION
SODIUM BROMIDES
STAINLESS STEELS