Fastener Guide / Plating, Coatings & Finishes

Zinc-Iron and Zinc-Cobalt

Zinc-iron (about 0.3 - 1% iron) and zinc-cobalt (about 0.5 - 1% cobalt) are zinc alloy plates that improve on plain zinc. Zinc-nickel has largely overtaken both in automotive work.

Last reviewed 2026-09-10 · Governing standard: ISO 19598; supplier / OEM specifications · reference FG-AE8101 · Report an error on this sheet

Zinc alloys compared

AlloyAlloying contentNotes
Zinc-ironAbout 0.3 - 1% FeGood black finish; modest improvement over zinc
Zinc-cobaltAbout 0.5 - 1% CoImproved corrosion; less common today
Zinc-nickelAbout 12 - 16% NiHighest corrosion life of the three

These tables carry the same figures as the printed sheet below.

The printed sheet

Zinc-Iron and Zinc-Cobalt

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Text version of this sheet

Zinc-iron and zinc-cobalt alloy electroplates

What it is

FIELD IDENTIFICATION

Zinc-iron (about 0.3 - 1% iron) and zinc-cobalt (about 0.5 - 1% cobalt) are zinc alloy plates that

improve on plain zinc. Zinc-nickel has largely overtaken both in automotive work.

ZN-FE

ZN-CO

Zinc alloy electroplates

Zinc alloys compared

Alloy

Alloying content

Notes

Zinc-iron

About 0.3 - 1% Fe

Good black finish; modest improvement over zinc

Zinc-cobalt

About 0.5 - 1% Co

Improved corrosion; less common today

Zinc-nickel

About 12 - 16% Ni

Highest corrosion life of the three

Key points

Electroplating can load high-hardness steel with hydrogen. Parts at roughly HRC 39 and above (Grade 8, 10.9, 12.9, A574) need a qualified process and a

prompt embrittlement-relief bake, or a non-electrolytic coating instead.

Governing standards: ISO 19598; supplier / OEM specifications. Editions shown are the latest confirmed as of September 2026. The drawing and the governing standard always take

precedence over this sheet.

torquing any fastener. Verify the current governing standard, project documents, OEM requirements, size, thread, coating and lot certification. To the fullest extent permitted by law, The Fastener App disclaims liability

arising from reliance on this reference.

Fastener Guide reference FG-AE8101 · thefastenerapp.com/fastener-guide/plating-coatings-finishes/zinc-iron-and-zinc-cobalt · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.

Related sheets

← Zinc-NickelCadmium Plating →

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