Zinc Alloys

Modern Plating specializes in the application of high performance zinc-alloy finishes. These alloy finishes provide superior corrosion protection and offer an environmentally friendly alternative to cadmium due to the toxicity of cadmium and the cyanide used in the cadmium plating process. The demand for higher quality, longer lasting, more corrosion resistant coatings in industries such as automotive and electrical components has driven the development of these finishes. Modern currently offers all of the alloy finishes with either a clear and/or a black trivalent finish. Hexavalent chromates are being eliminated by the automotive industry due to the carcinogenic nature of Chrome VI and are being replaced by trivalent chromates.

Click to view product info on all Zinc Alloys (PDF)


Zinc-nickel offers the greatest corrosion resistance of all the alloy finishes. It is often used as a substitute for cadmium althoughit does not offer the lubricity of cadmium nor its cosmetic appearance. It does offer high resistance to heat and UV light and does not promote galvanic corrosion when in contact with aluminum. It is considered a hard finish with good resistance to abrasion.


Zinc-iron offers good weldability and ductility making it a good choice for components that will undergo subsequent manufacturing operations. It is often used on parts that are to be painted. It is the least expensive. Zinc-iron clear offers a good cosmetic appearance. Zinc-iron is most suitable for black chromate.


Tin-zinc is the newest of the alloys. It offers excellent corrosion protection. It is often used as a replacement for cadmium due to its excellent conductivity and lubricity. It offers excellent solderability and superior ductility. It is rapidly gaining in popularity particularly in the automotive industry and is very often used in grounding applications. It is a non-cosmetic finish.


Modern Plating is certified to apply the environmentally-friendly Sharperize® chrome-free zinc nickel finish. The Sharperize process includes the application of a proprietary electrodeposited zinc nickel plating followed by a series of secondary sealers. Depending on the specific requirements, these sealers can protect parts from UV rays as well as increase or decrease torque tension.

The Sharperize finish is extremely thin and yet provides outstanding corrosion resistance (1,000 hours + in neutral salt spray testing). Sharperize virtually eliminates the thread and recess fill commonly associated with high performance finishes. Parts with the Sharperize finish on them are a uniform, semi-glossy black in color.

Sharperize is approved for many automotive specifications including: Ford WSS-M2P189-A1 through A- 60; and Ford WSS-M21P25-B1. Please contact Modern Plating Customer Service regarding specification approvals.


Featured Finishes Gallery

Acid Zinc - Black Trivalent Chromate
Alkaline Zinc - Black Trivalent Chromate
Alkaline Zinc - Clear Chromate
Alkaline Zinc - Clear Chromate
Alkaline Zinc - Clear Chromate
Geomet 321
Sharperize Zinc Nickel Black
Tin Zinc Clear
Zinc Plus3 ZN Clear
ZincKlad 250
ZincKlad 500 Zinc Iron Black
ZincKlad 500 Zinc Iron Clear
ZinKlad 1000 Zinc Nickel Black
ZinKlad 1000 Zinc Nickel Clear Nut

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