Minimum Salt Spray Test Requirements
With trivalent chromites and a sealer or topcoat

Alloy

Thickness
(micrometers)

Trivalent Chromite

Hours to White Rust
(Barrel)

Hours to Red Rust
(Barrel)

Zinc-Nickel

5

Clear

120

720

Zinc-Nickel

8

Clear/Black

120

840

Zinc-Cobalt

5

Clear

96

264

Zinc-Cobalt

8

Clear/Black

96

408

Zinc-Iron

5

Clear

96

264

Zinc-Iron

8

Clear/Black

96

408