Zinc Iron Plating

Zinc-iron plating produces alloys containing 15 to 25% Fe as-plated. Advantages of this alloy are good weldability and ductility. It is electroplated on steel coil and strip for auto bodies. Strip for the manufacture of automotive components is also plated in baths that produce 1% Fe in the alloy deposit; a special feature of this alloy is its suitability for deep black chromating.

The corrosion resistance of zinc-iron is generally lower than that of the other zinc alloys, especially after exposure to high temperatures such as those encountered by under-the-hood automotive components. A typical zinc-iron solution composition used in strip line plating is:

Constituent

Content

g/L

oz/gal

Ferric sulfate

200-300

27-40

Zinc sulfate

200-300

27-40

Sodium sulfate

20-40

2.7-5.3

Sodium acetate

10-30

1.3-4

Organic additive

1-5

0.1-0.66

0 0

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