Corrosão de ferro por sacrifício em contacto com cobre

Forfatter/Opretter:

Ricardo Maçãs

Attribution:

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Kredit:

Eget arbejde

Shortlink:

https://dkwiki.dk/b/33144

kilde:

Wikimedia Commons

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2046 x 1534 Pixel (913568 Bytes)

beskrivelse:

Corrosion of a iron nail with a coiled copper wire, in agar-agar medium with ferroxyl indicator solution (potassium hexacyanoferrate(III), indicator of iron ions, and phenolphthalein, indicator of hydroxide ions). Results obtained after 3 days. Due to presence of copper, the iron is corroded faster because it is the sacrificial metal in this case. The blue color near the iron indicates the presence of iron ions in the medium (iron oxidation - anodic zone) and pink near the copper indicates the presence of hydroxide ions in the medium (oxygen reduction - cathodic zone).

Licens:

CC BY-SA 3.0

Licensbetingelser:

Creative Commons Attribution-Share Alike 3.0