کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1470332 | 990323 | 2011 | 10 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Corrosion product analysis on crevice corroded Alloy-22 specimens Corrosion product analysis on crevice corroded Alloy-22 specimens](/preview/png/1470332.png)
Surface analytical techniques were applied to characterize corrosion products formed during the crevice corrosion of the Ni–Cr–Mo(W) Alloy-22 in 5 mol/L NaCl at 120 °C. Micro-Raman spectroscopy demonstrated the formation of polymeric molybdates within the crevice corroded region where intergranular corrosion dominated. The location and chemical speciation of the Mo and W species formed was investigated by Raman mapping. Crevice corrosion was found to propagate preferentially across the alloy surface rather than to penetrate deeply at localized sites, a feature which appears to be linked to the formation and build-up of polymeric molybdates.
Research highlights
► Crevice corrosion products on Alloy-22 were identified by micro-Raman spectroscopy.
► Polymeric molybdates, formed at low pH conditions, accumulated at damaged regions.
► Polymeric molybdates are proposed to inhibit crevice propagation.
Journal: Corrosion Science - Volume 53, Issue 5, May 2011, Pages 1670–1679