The influenec of negative half-cycle rectified and full-wave sinusoidal potentials superimposed at two DC levels on carbon steel (1018) in 3.33 % NaCl solution under nitrogen purge on materials degradation behavior was investigated. The results obtained indicate that the metal dissolution rate increases with the peak potential for the two signals applied at 60 Hz and a fixed potential of -580 mV(SCE). The dissolution rate was found to be the highest for the full-wave sinusoidal and the lowest for the negative half-cycle rectified signals. The metal dissolution rate decreases for the negative half-cycle rectified, but increases moderately for the full-wave sinusoidal potential with the peak potential for experiments conducted at a potential of -780 mV(SCE). Generally, the current was found not to decrease with time except for the experiment involving application of signals at a more cathodic potential of -780 mV(SCE). Micrographs show that the samples experienced extensive pitting. Energy dispersive X-ray analysis data show that the chloride content in corrosion products increases as the metal dissolution rate increases. The data indicate that the arithmetic sum of materials degradation rates for the positive half-cycle and negative half-cycle rectified potentials approximately equals the rate for the full-wave sinusoidal potential. The data strongly indicate that although the corrosion is enhanced by the application of alternating voltages, the rate is generally determined by the DC potential.
The corrosion of carbon steel in a chloride environment due to periodic voltage modulation: part II
Die Korrosion von unlegiertem Stahl in einer chloridhaltigen Umgebung ausgelöst durch periodische Spannungsmodulation: Teil 2
Corrosion Science ; 37 , 10 ; 1583-1598
1995
16 Seiten, 14 Bilder, 3 Tabellen, 6 Quellen
Aufsatz (Zeitschrift)
Englisch
unlegierter Stahl , Meerwasserkorrosion , Natriumchlorid , wässrige Lösung , Wechselstrom , Gleichrichter , elektrochemisches Potenzial , Korrosionsstrom , Korrosionsprodukt , ESCA-Spektroskopie , Lochkorrosion , Meerumwelt , Meereskonstruktion , Wellenform , Elektrolyt , Meerestechnik , wässriger Elektrolyt
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