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What is trivalent zinc plating?

Author

Ava White

Updated on March 11, 2026

What is trivalent zinc plating?

Trivalent coatings were developed to reduce the amount of Hexavalent chromate in the environment without sacrificing corrosion resistance. Cadillac Plating Corporation offers Trivalent Chromates with three (3) color choices and in Zinc or Zinc-Iron baths.

Similarly, it is asked, what is difference between trivalent and hexavalent zinc plating?

The key difference between trivalent and hexavalent zinc plating is that the trivalent zinc plating process has a high efficiency with a uniform distribution than the hexavalent zinc plating process. Zinc plating is a common process of protecting a wide range of materials. It can act as a sacrificing coat.

Similarly, what is trivalent passivation? Trivalent chromium passivation is used after zinc plating for enhancing corrosion resistance of parts. In the passivating process, the amount of dissolved metal ions (for example zinc and iron) in the passivation solution increases the longer the solution is used.

Simply so, what is zinc iron plating?

Zinc & zinc Iron are bluish- white, lustrous metals that can be electrolytically depos- ited onto steel. It gives an appearance of a bright nickel- chrome coating. Zinc & zinc iron are two of the most often used metals for plating. Zinc iron is a zinc plating with an iron alloy added to increase corrosion resistance.

How long does zinc plating last?

5 years

How does zinc plating work?

Zinc plating, a process also known as galvanization, is the deposition of a thin layer of aluminum onto a metal component to provide a protective layer. Zinc plating is often applied to iron or steel parts whose surface would rust when exposed to air or water.

What is the color of zinc plating?

Types of Zinc Plating
Yellow Zinc — This type of zinc coating is commonly used in the automotive industry and offers an average level of protection against corrosion. Black Zinc — Black zinc coatings are available as a black oxide that can actually be olive-drab in color, or as a pure black coating.

Does chrome plating contain hexavalent chromium?

However, chrome plating is metal and contains no hexavalent chromium after it is rinsed, so chrome plating is not banned.

What is Blue passivation?

Blue Zinc also known as clear passivate or silver zinc. Traditionally the blue chromates provided up to 48 hours protection to white corrosion in a salt spray cabinet. As demonstrated in the images above and below zinc plating (especially with clear blue chromates) can vary greatly depending on the base metal quality.

What is passivation of zinc plating?

The process of chromate conversion coating of zinc plated parts is sometimes called "passivation". Zinc plated steel is almost always a bright, silver colored finish. Chromate conversion coatings are applied for increased corrosion resistance.

Is standard for zinc plating?

1.1 This standard covers requirements for electrodeposited zinc coatirrgs applied to iron or steel articles except for coatings applied to components having threads of basic major diameter from 1.25 to 12.5 mm-and coatings applied to sheet or wire in the unfabricated formor to close-coiled springs.

What is yellow passivation?

Yellow Zinc Plating. Yellow Zinc Plating refers to the color of the chromate that is applied after zinc has been deposited on to the surface of the part. Yellow chromate prevents the zinc from corroding and increases the overall protection of the finish.

Why hexavalent chromium is toxic?

All hexavalent chromium compounds are toxic (due to their oxidizing power) as well as carcinogenic (IARC Group 1), especially if airborne and inhaled where they cause lung cancer. Also positive associations have been observed between exposure to chromium (VI) compounds and cancer of the nose and nasal sinuses.

What is black zinc?

Black Zinc Plating refers to the color of the chromate that is applied during the post plating process. It includes a layer of zinc applied to a parts surface followed by black chromate applied over the zinc. Black Zinc is commonly specified for its dark appearance and protective properties.

What is iron plating?

Iron Plating. the process of electrodeposition of iron on metal articles when direct current is passed through an electrolyte whose main constituent is ferrous sulfate or chloride. Iron plating is also used to restore the dimensions of worn machinery parts.

What is white passivation?

White Zinc Plating ( White Passivation) Get Latest Price. Our range of White Trivalent Chrome Plating Service often referred to simply as chrome, is a technique of electroplating a thin layer of chromium onto a metal object.

What is chromate passivation?

Chromate conversion coating is a type of conversion coating used to passivate steel, aluminium, zinc, cadmium, copper, silver, magnesium, and tin alloys. It is primarily used as a corrosion inhibitor, primer, decorative finish, or to retain electrical conductivity.

What is black passivation?

BLACK PASSIVATION (BLACK PASSIVATE) is better known as "Black Oxide Class 2, Black Oxide Class 3, or Black Oxide Class 4" for corrosion resistant steel alloys. It is a conversion coating that produces a uniform, attractive, and non-reflective black finish on stainless steels.

What does zinc and yellow passivated mean?

1. Yes, "yellow chromated" and "yellow passivated" are the same -- meaning an electroplated finish (usually zinc plating because it's the least expensive) followed by a chromate conversion coating which shall be yellow in color.

How does chromate conversion coating work?

A chromate conversion coating expert uses the process to make alloys unreactive by changing the surface coating of the surface or a layer with a thin inert layer. While hexavalent chromium is the chemical most commonly used in the immersion bath process wherein the coating is applied, it's highly toxic and regulated.

What color is trivalent chromium?

Trivalent chromium electroplating processes have been commercially available since the mid 1970s. Processes are available today offering deposits with colors varying from gray-black to almost the blue- white appearance of hexavalent chromium.

What is trivalent chromium?

Trivalent chromium plating, also known as tri-chrome, Cr3+, and chrome (III) plating, uses chromium sulfate or chromium chloride as the main ingredient. Trivalent chromium plating is an alternative to hexavalent chromium in certain applications and thicknesses (e.g. decorative plating).

Is trivalent chromate RoHS compliant?

The substance of concern with regard to chromate conversion coatings on zinc plating and RoHS compliance is hexavalent chromium. The RoHS Directive restricts hexavalent chromium, but does not restrict less hazardous trivalent chromium. Therefore all -ZI product plated after June 2002 is RoHS compliant.

Which is better galvanized or zinc plated?

Zinc plating (also known as electro-galvanising) is a process where zinc is applied by using a current of electricity. While is does provide some rust protection, its thinner coating is not as rust resistant as hot dip galvanising. Its main advantage is it is cheaper and easier to weld.

How much does zinc plating cost?

Price list as of May 1, 2014
PLATINGDESCRIPTIONMINIMUM
ZincBlack$70.00
ZincOlive Drab$70.00
ZincType IV (phosphate)$70.00
Copper$50.00

Why does zinc not rust?

The zinc layer acts as a sacrificial metal for the steel. This means that the zinc layer will combine with the oxygen more readily than the iron in the steel will. This creates a zinc oxide layer that prevents the formation of iron oxide, thus eliminating the possibility of rust forming.

Is zinc plated better than stainless steel?

1 Answer. Stainless steel can be used up to temperatures of about 1000C. The corrosion resistance of zinc plating decreases rapidly above 100C, and embrittlement can occur above 500C. Zinc plating has lower resistance to chemical corrosion from acids and alkalis than stainless steel.

Does Zinc rust in water?

Like all ferrous metals, zinc corrodes when exposed to air and water. However, zinc corrodes at a rate of 1/30 of that for steel. Also like other ferrous metals, zinc corrodes or rusts at different rates depending on its environment (8). The patina layer is the products of zinc corrosion and rust.

Is zinc plated waterproof?

Zinc Plating
Fasteners that have been zinc plated have a shiny, silvery or golden appearance, referred to as clear or yellow zinc respectively. They are fairly corrosion resistant but will rust if the coating is destroyed or if exposed to a marine environment.

Is zinc good for outdoor use?

Zinc plating is rarely sufficient for exposed outdoor use, especially in a marine environment. For underwater use forget it. No other corrosion resistant coating will be as inexpensive as zinc plating though.

Is galvanized rust proof?

Although it does not last infinitely, galvanized steel is the unparalleled corrosion-resistant metal. It is worth noting however, that applying a protective coating such as paint to galvanized steel will alleviate the problems caused by corrosion of the protective zinc coating.

How thick is zinc plating?

8-15 µm

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