Role of Manganese Sulfide Inclusions on Pit Initiation of Super Austenitic Stainless Steels
2003; Volume: 59; Issue: 1 Linguagem: Inglês
10.5006/1.3277537
ISSN1938-159X
AutoresJung O. Park, Thomas Suter, H. Böhni,
Tópico(s)Concrete Corrosion and Durability
ResumoAbstract Large-scale (∼1 cm2) measurements and immersion tests were conducted on stainless steels (SS) to study the role of Mo content and manganese sulfide (MnS) inclusions on corrosion. Higher S content increased the number of pits and an increase in Mo content produced smaller pits on SS. It was found that the Mo content influenced repassivation of pits and MnS inclusions affected pit initiation. A microelectrochemical cell (d = 100 μm) was used to investigate the corrosion of SS with 6% Mo content (DIN 1.4529 [UNS S31254]) in sodium sulfate (Na2SO4), sodium chloride (NaCl), and lithium chloride (LiCl) solutions of neutral pH at room temperature. It was found that MnS inclusions on DIN 1.4529 dissolved in both NaCl and Na2SO4 after 2 h of potentiostatic experiments. Dissolution of inclusions did not cause observable dissolution of the bulk material around the inclusions in NaCl and Na2SO4 solutions. In large-scale and microelectrochemical experiments, the breakdown of DIN 1.4529 occurred around 0 V vs ...
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