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Fe, Co, Ni + O
2
Fe
3 Fe + 2 O
2
Fe
3
O
4
4 Fe + 3 O
2
2 Fe
2
O
3
Co
3 Co + 2 O
2
Co
3
O
4
Ni
2 Ni + O
2
2 NiO
Fe, Co, Ni + HCl, HNO
3
Fe
Fe + 2 HCl
FeCl
2
+ H
2
+ HNO
3
: Passivation
Co
Co + 2HCl
CoCl
2
+ H
2
Co + 4 HNO
3
2 Co(NO
3
)
2
+ 2 NO
2
+2 H
2
O
Ni
Ni + 2HCl
NiCl
2
+ H
2
+ HNO
3
: Passivation
Fe3O4 2 Fe2O3 Co3O4 2 NiO
