Passivation of sponge iron

Details Passivation of sponge iron Passivation of sponge iron

1981-08-04

1983-06-14

Stallard, W.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

75 05R, 75 05AA, 75 05BA, 75256, 427242, 428403, 428404, 428469, 428471, 106 89, C04B 722

Patent

active

043881165

ABSTRACT:
Sponge iron pellets are protected against re-oxidation by pre-wetting them with water or steam, coating them with a pulverulent passivating agent which is a mixture of iron oxide particles and hydraulic cement particles, then drying the treated pellets. Especially good results are achieved by using a hydraulic cement such as Portland cement and an iron oxide/cement ratio of 40:60 to 70:30.

REFERENCES:
patent: 4030913 (1977-06-01), Wegener
patent: 4069015 (1978-01-01), Ahrendt et al.
patent: 4254167 (1981-03-01), Sulzbacher et al.

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