Microbially deposited manganese and iron oxides on passive metals - their chemistry, distribution, and consequences for material performance
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316L stainless steel and Ti-6A1-4V corrosion coupons exposed to fresh river water ennobled the open circuit potential (OCP) to values of +365 mVsce and +400 mVsce , respectively. ToF-SIMS spectra indicated that the biominerals on the metal surfaces area a mixture of Fe2O3, Mn3O4 on partially ennobled coupons. Biomineralized manganese and iron oxides on the 316L stainless steel surfaces, regardless of the oxidation states, endanger the material integrity in a similar manner, as evidenced by the elevated OCP and increased cathodic current density upon mild polarization.
Shi X, Avci R, Lewandowski Z. Microbially Deposited Manganese and Iron Oxides on Passive Metals—Their Chemistry and Consequences for Material Performance. CORROSION. 2002 Sep;58(9):728–38.