Role of surface finishing on pitting corrosion of a duplex stainless steel in seawater
- ENIT, Tunis (Tunisia). Lab. of Metallurgy and Materials
- STEG, Tunis (Tunisia)
Localized corrosion of duplex UNS S32550 stainless steel in seawater was investigated in the laboratory and in field trials for several surface finish conditions: polished, ground, and sandblasted. Electrochemical data obtained by polarization curves showed that the smoother, polished surface had better characteristics (higher pitting and protection potentials) than the ground or sandblasted surfaces. However, despite its high degree of roughness, the sandblasted surface was the most resistant in field conditions, exhibiting the lowest number of sites attacked. Internal compressive stresses created by sandblasting seem also to have an unsensitizing effect on sensitized zones that exist in cast steel (due to repairs of mold defects), reducing its susceptibility to microbiologically influenced corrosion (MIC). Such stresses are not generated in polished or ground surfaces, and localized MIC attack can occur.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 230702
- Journal Information:
- Journal of Materials Engineering and Performance, Vol. 5, Issue 2; Other Information: PBD: Apr 1996
- Country of Publication:
- United States
- Language:
- English
Similar Records
Quality control and assurance program for duplex stainless steels, field experience
The influence of Cu on the pitting corrosion of duplex stainless steel UNS S32550
Related Subjects
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES
IRON BASE ALLOYS
PITTING CORROSION
CHROMIUM ALLOYS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
COPPER ALLOYS
THERMAL POWER PLANTS
MATERIALS
SILICON ADDITIONS
MANGANESE ADDITIONS
NITROGEN ADDITIONS
SURFACE PROPERTIES
ROUGHNESS
POLISHING
GRINDING
SURFACE CLEANING
BENCH-SCALE EXPERIMENTS
FIELD TESTS
WELDED JOINTS
ELECTROCHEMISTRY