Rhwd

Haearn ocsid yw rhwd a gynhyrchir gan adwaith rhydocs rhwng haearn ac ocsigen. Ymdoddir carbon deuocsid yn yr atmosffer mewn dŵr gan ffurfio hydoddiant asid sy

Rhwd
Rhwd ar bibell a'r paent wedi plicio.

Haearn ocsid yw rhwd a gynhyrchir gan adwaith rhydocs rhwng haearn ac ocsigen. Ymdoddir carbon deuocsid yn yr atmosffer mewn dŵr gan ffurfio hydoddiant asid sydd yn adweithio â'r haearn, neu aloi haearn megis dur, i greu haearn (II) ocsid. Yna, caiff ei ocsideiddio gan ffurfio haearn (III) ocsid, sydd yn gadael yr haen ruddgoch a elwir rhwd. Gelwir y broses yn rhydu, sydd yn fath o gyrydiad. Gellir atal rhwd drwy galfaneiddio'r metel.

Eginyn erthygl sydd uchod am gemeg. Gallwch helpu Wicipedia drwy ychwanegu ato.

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