Mechanisms of hydrogen evolution on chromium
Mehanizmi izdvajanja vodonika na hromu
Apstrakt
In this work, the mechanisms of hydrogen evolution on the metal chromium in a solution of 0.1 M Na2SO4 + H2SO4, pH 1 to pH 7 were analysed. In the pH LT 3 range, hydrogen is evolved according to three different mechanisms, depending on the experimental conditions: electrochemical evolution of H2 by reaction of H+ ions according to the Volmer-Heyrovsky mechanism, on the bare chromium surface, during chemical dissolution of chromium by the Kolotyrkin mechanism, which does not depend on the electrode potential, and electrochemical hydrogen evolution by the Volmer-Heyrovsky mechanism, but on the passive chromium. At pH values greater than 3, the fourth mechanism of hydrogen evolution is observed, that is electrochemical reaction of water molecules on the surface of oxide covered chromium surface.
U ovom radu analizirani su mehanizmi izdvajanja vodonika na metalnom hromu u rastvoru 0,1 M Na2SO4 + H2SO4, pH 1 do pH 7. U oblasti pH LT 3 vodonik se izdvaja u zavisnosti od eksperimentalnih uslova po tri različita mehanizma: elektrohemijskim izdvajanjem H2 reagovanjem H+ jona po mehanizmu Folmer-Hejrovski na čistoj površini hroma, pri hemijskom rastvaranju hroma po mehanizmu Kolotirkina, a koje ne zavisi od elektrodnog potencijala i elektrohemijskim izdvajanjem vodonika po mehanizmu Folmer-Hejrovski, ali na pasivnom hromu. Pri pH vrednostima većim od 3 uočava se i četvrti mehanizam izdvajanja vodonika elektrohemijskim reagovanjem molekula vode na oksidom presvučenoj površini hroma.
Ključne reči:
chromium / corrosion / chemical dissolution / hydrogen evolution / hrom / korozija / hemijsko rastvaranje / izdvajanje vodonikaIzvor:
Mining and Metallurgy Engineering Bor, 2015, 3, 145-156Izdavač:
- Institut za rudarstvo i metalurgiju Bor
Finansiranje / projekti:
- Istraživanje i optimizacija tehnoloških i funkcionalnih performansi ventilacionog mlina termoelektrane Kostolac B (RS-MESTD-Technological Development (TD or TR)-34028)
- Razvoj tehnologije izrade obloge i jezgra na bazi domaćih sirovina za proizvodnju specijalnih obloženih elektroda namenjenih za elektrolučno zavarivanje čelika (RS-MESTD-Technological Development (TD or TR)-34016)
Institucija/grupa
IHTMTY - JOUR AU - Jegdić, Bore AU - Bobić, Biljana AU - Jegdić, Aleksandar AU - Stevanović, Maja PY - 2015 UR - https://cer.ihtm.bg.ac.rs/handle/123456789/1770 AB - In this work, the mechanisms of hydrogen evolution on the metal chromium in a solution of 0.1 M Na2SO4 + H2SO4, pH 1 to pH 7 were analysed. In the pH LT 3 range, hydrogen is evolved according to three different mechanisms, depending on the experimental conditions: electrochemical evolution of H2 by reaction of H+ ions according to the Volmer-Heyrovsky mechanism, on the bare chromium surface, during chemical dissolution of chromium by the Kolotyrkin mechanism, which does not depend on the electrode potential, and electrochemical hydrogen evolution by the Volmer-Heyrovsky mechanism, but on the passive chromium. At pH values greater than 3, the fourth mechanism of hydrogen evolution is observed, that is electrochemical reaction of water molecules on the surface of oxide covered chromium surface. AB - U ovom radu analizirani su mehanizmi izdvajanja vodonika na metalnom hromu u rastvoru 0,1 M Na2SO4 + H2SO4, pH 1 do pH 7. U oblasti pH LT 3 vodonik se izdvaja u zavisnosti od eksperimentalnih uslova po tri različita mehanizma: elektrohemijskim izdvajanjem H2 reagovanjem H+ jona po mehanizmu Folmer-Hejrovski na čistoj površini hroma, pri hemijskom rastvaranju hroma po mehanizmu Kolotirkina, a koje ne zavisi od elektrodnog potencijala i elektrohemijskim izdvajanjem vodonika po mehanizmu Folmer-Hejrovski, ali na pasivnom hromu. Pri pH vrednostima većim od 3 uočava se i četvrti mehanizam izdvajanja vodonika elektrohemijskim reagovanjem molekula vode na oksidom presvučenoj površini hroma. PB - Institut za rudarstvo i metalurgiju Bor T2 - Mining and Metallurgy Engineering Bor T1 - Mechanisms of hydrogen evolution on chromium T1 - Mehanizmi izdvajanja vodonika na hromu IS - 3 SP - 145 EP - 156 DO - 10.5937/mmeb1503145j ER -
@article{ author = "Jegdić, Bore and Bobić, Biljana and Jegdić, Aleksandar and Stevanović, Maja", year = "2015", abstract = "In this work, the mechanisms of hydrogen evolution on the metal chromium in a solution of 0.1 M Na2SO4 + H2SO4, pH 1 to pH 7 were analysed. In the pH LT 3 range, hydrogen is evolved according to three different mechanisms, depending on the experimental conditions: electrochemical evolution of H2 by reaction of H+ ions according to the Volmer-Heyrovsky mechanism, on the bare chromium surface, during chemical dissolution of chromium by the Kolotyrkin mechanism, which does not depend on the electrode potential, and electrochemical hydrogen evolution by the Volmer-Heyrovsky mechanism, but on the passive chromium. At pH values greater than 3, the fourth mechanism of hydrogen evolution is observed, that is electrochemical reaction of water molecules on the surface of oxide covered chromium surface., U ovom radu analizirani su mehanizmi izdvajanja vodonika na metalnom hromu u rastvoru 0,1 M Na2SO4 + H2SO4, pH 1 do pH 7. U oblasti pH LT 3 vodonik se izdvaja u zavisnosti od eksperimentalnih uslova po tri različita mehanizma: elektrohemijskim izdvajanjem H2 reagovanjem H+ jona po mehanizmu Folmer-Hejrovski na čistoj površini hroma, pri hemijskom rastvaranju hroma po mehanizmu Kolotirkina, a koje ne zavisi od elektrodnog potencijala i elektrohemijskim izdvajanjem vodonika po mehanizmu Folmer-Hejrovski, ali na pasivnom hromu. Pri pH vrednostima većim od 3 uočava se i četvrti mehanizam izdvajanja vodonika elektrohemijskim reagovanjem molekula vode na oksidom presvučenoj površini hroma.", publisher = "Institut za rudarstvo i metalurgiju Bor", journal = "Mining and Metallurgy Engineering Bor", title = "Mechanisms of hydrogen evolution on chromium, Mehanizmi izdvajanja vodonika na hromu", number = "3", pages = "145-156", doi = "10.5937/mmeb1503145j" }
Jegdić, B., Bobić, B., Jegdić, A.,& Stevanović, M.. (2015). Mechanisms of hydrogen evolution on chromium. in Mining and Metallurgy Engineering Bor Institut za rudarstvo i metalurgiju Bor.(3), 145-156. https://doi.org/10.5937/mmeb1503145j
Jegdić B, Bobić B, Jegdić A, Stevanović M. Mechanisms of hydrogen evolution on chromium. in Mining and Metallurgy Engineering Bor. 2015;(3):145-156. doi:10.5937/mmeb1503145j .
Jegdić, Bore, Bobić, Biljana, Jegdić, Aleksandar, Stevanović, Maja, "Mechanisms of hydrogen evolution on chromium" in Mining and Metallurgy Engineering Bor, no. 3 (2015):145-156, https://doi.org/10.5937/mmeb1503145j . .