FASTENERS 101™ Plating, Coating, and Finishes FAQ

Frequently Asked Questions (FAQ) About Plating, Coating, and Finishes

Zinc Plating

How strong is zinc plated steel?

Zinc plated steel is available in several grades, including Grade 2, Grade 5, and Grade 8.

How do I cut zinc plated steel?

Zinc plated steel can be cut with any steel-cutting saw, but damaging the outer layer will accelerate corrosion.

Why should I use zinc plated steel?

Zinc plating acts as a sacrificial barrier, rusting first to extend assembly life, and is more affordable than stainless steel or silicon bronze.

What color is zinc plated steel?

It’s often a shiny silver, sometimes with a blue hue; Grade 8 may appear golden with green, yellow, or amber variations.

What is zinc plated steel?

Zinc plated steel is steel coated with zinc to enhance corrosion resistance.

Can zinc plated steel rust?

Yes, it can rust and is not suitable for harsh environments.

Can zinc plated steel be painted?

Yes, use paint that adheres to zinc.

Can zinc plated steel be used outside?

Yes, but it will rust quickly in harsh environments.

How long does zinc plating last?

Durability depends on environment; it can last 5-20 years in mild conditions with proper care.

Is zinc plating environmentally friendly?

It’s less eco-friendly due to zinc mining and plating processes, but recyclable if handled properly.

Hot Dip Galvanizing

Will galvanized steel rust?

Galvanized steel may rust over time but is much more corrosion-resistant than zinc plating.

Will galvanized steel rust in concrete?

It may rust in concrete depending on the environmental conditions.

How should I cut galvanized steel?

Use a protective ventilation mask, goggles, and wash skin after cutting due to health hazards.

Why is galvanized steel preferred outside?

It’s corrosion-resistant in harsh environments, making it ideal for exterior use.

How thick is galvanized coating?

Typically 50-85 microns, depending on the galvanizing process and steel thickness.

Can galvanized steel be welded?

Yes, but it releases zinc fumes; use proper ventilation and safety gear.

Black Oxide

What is black oxide?

Black oxide is a finish coating materials for a sleek, finished, and abrasive surface.

Will black oxide rust?

It’s susceptible to rust if marred and turns brown in high heat.

Will black oxide screws rust?

Black oxide screws rust if marred and turn brown in high heat.

Will black oxide prevent rust?

It delays rust with a coated layer, often enhanced by a thin oil layer.

Will black oxide stainless steel rust?

It can rust if marred, but less likely with proper application.

Where can I buy black oxide?

A good place to start is Black Oxide Fasteners.

Why would I use a black oxide coating?

It provides a sleek black finish unmatched by raw materials.

Is black oxide durable?

Yes, but its durability depends on the base material and maintenance; it’s not as protective as galvanizing.

Can black oxide be removed?

Yes, using chemical strippers or abrasive methods, but it requires care to avoid damaging the base metal.