Corrosion Protection

Corrosion rates for zinc alloy coatings as demonstrated by the neutral salt spray test are:

Coating(a)

Hours to red rust

Zinc

200-250

Zinc-iron (1% Fe)

350

Zinc-cobalt (0.8% Co)

500

Zinc-nickel (8% Ni)

1000

Tin-zinc (70% Sn)

1000

(a) Coating thickness, 8 ^m; iridescent yellow chromate post-treatment

(a) Coating thickness, 8 ^m; iridescent yellow chromate post-treatment

Nickel Alloy Plating

S. Alec Watson, Nickel Development Institute

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