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Title: Role of surface finishing on pitting corrosion of a duplex stainless steel in seawater

Abstract

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.

Authors:
;  [1];  [2]
  1. ENIT, Tunis (Tunisia). Lab. of Metallurgy and Materials
  2. STEG, Tunis (Tunisia)
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
230702
Resource Type:
Journal Article
Journal Name:
Journal of Materials Engineering and Performance
Additional Journal Information:
Journal Volume: 5; Journal Issue: 2; Other Information: PBD: Apr 1996
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 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

Citation Formats

Salah-Rousset, N B, Chaouachi, M A, and Chellouf, A. Role of surface finishing on pitting corrosion of a duplex stainless steel in seawater. United States: N. p., 1996. Web. doi:10.1007/BF02650891.
Salah-Rousset, N B, Chaouachi, M A, & Chellouf, A. Role of surface finishing on pitting corrosion of a duplex stainless steel in seawater. United States. https://doi.org/10.1007/BF02650891
Salah-Rousset, N B, Chaouachi, M A, and Chellouf, A. 1996. "Role of surface finishing on pitting corrosion of a duplex stainless steel in seawater". United States. https://doi.org/10.1007/BF02650891.
@article{osti_230702,
title = {Role of surface finishing on pitting corrosion of a duplex stainless steel in seawater},
author = {Salah-Rousset, N B and Chaouachi, M A and Chellouf, A},
abstractNote = {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.},
doi = {10.1007/BF02650891},
url = {https://www.osti.gov/biblio/230702}, journal = {Journal of Materials Engineering and Performance},
number = 2,
volume = 5,
place = {United States},
year = {Mon Apr 01 00:00:00 EST 1996},
month = {Mon Apr 01 00:00:00 EST 1996}
}