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An electrochemical, topographical and analytical study on the behaviour of the metal‐metalloid glass (Fe, Cr) 80 (P, C, Si) 20 in chloride or sulfate containing aqueous solutions
Author(s) -
Burghoff M.,
Wihsmann F. G.,
Kästner R.,
Forkel K.,
Born D.
Publication year - 1997
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.19970480503
Subject(s) - tafel equation , metalloid , aqueous solution , electrochemistry , chloride , metal , analytical chemistry (journal) , sulfate , sodium sulfate , scanning electron microscope , inorganic chemistry , chemistry , materials science , nuclear chemistry , electrode , metallurgy , sodium , composite material , chromatography
The metal‐metalloid glass (Fe, Cr) 80 (P, C, Si) 20 was investigated in aqueous solutions which contain high quantities of NaCl (3 M). For comparison we use a solution with 1.5 M Na 2 SO 4 . These solutions reach from the strong acid area (0.5 M H 2 SO 4 ) to the strong alkaline region (1 M NaOH). The corrosive properties of the metal‐metalloid glass were determined at 25°C and 5°C. By the use of electrochemical methods it was possible to estimate the long time corrosive properties. Therefore current‐potential‐curves were determined by the use of a potentiodynamic technique. Starting from this curves it was possible by use of the tafel plot method or the determination of the polarisation resistance to. calculate an annual pull down of the metallic glass. For these electrochemical experiments we used the glass ribbons as electrodes and we measured under rotating conditions. The determined values of the annual pull down vary in a large region. The highest rate (44 mm/a) was calculated for an acid chloride containing solution at a temperature of 50°C. The lowest pull down rate (≈ 0.3 μm/a) is obtained in the alkaline solution at room temperature. In the alkaline area there is no difference between the addition of NaCl or Na 2 SO 4 . The treated glass fibres were characterised by the use of Scanning Electron Microscopy (SEM) and EDX‐Analysis.