Publish Time: 2025-07-15 Origin: Site
Zinc alloy souvenir coins have become an increasingly popular choice for commemorative and collectible items around the world. Their affordability, metallic appearance, and customizability make them ideal for organizations, events, and personal keepsakes. However, a frequent question arises among collectors and buyers: Will zinc alloy souvenir coins turn or tarnish over time? In this article, we’ll explore the chemical properties of zinc alloy, its susceptibility to environmental factors, how it compares to other metals, and what you can do to preserve your collectible for years to come.
Zinc alloy is not a single metal but a mixture of zinc with other elements like copper, aluminum, or magnesium. This blend is designed to enhance certain properties such as strength, corrosion resistance, and casting ability. Zinc alone is a reactive metal, but in alloy form, its behavior becomes more stable.
Durability: Strong and impact-resistant
Cost-efficiency: Cheaper than silver or brass
Flexibility in design: Perfect for 3D embossing, engraving, and coloration
Corrosion resistance: Decent protection but not as inert as precious metals
Despite these advantages, zinc alloys still maintain some chemical vulnerabilities. In particular, oxidation can occur when zinc comes into prolonged contact with moisture and air, leading to a white or greenish layer on the surface — a process commonly referred to as "turning" or tarnishing.
The answer is yes, zinc alloy coins can turn — but the extent and speed depend on several environmental and handling factors. The term “turn” typically refers to oxidation or discoloration that alters the coin’s appearance.
Humidity and Moisture Exposure
Zinc alloys are prone to corrosion when exposed to high humidity, especially if the protective coating (like electroplating or lacquer) is compromised.
Chemical Contaminants
Touching the coin with oily fingers or exposing it to acids or bases (like vinegar or cleaning solutions) can accelerate the reaction.
Storage Conditions
Coins stored in PVC-based holders or exposed to direct sunlight can undergo chemical reactions that affect the surface over time.
Lack of Coating
Coins without a surface finish (like nickel plating or enamel coating) are far more susceptible to environmental degradation.
So while zinc alloy coins are designed for aesthetic appeal and decent durability, they are not immune to tarnishing or turning, particularly in less-than-ideal storage situations.
Let’s see how zinc alloy fares compared to other popular coin materials in terms of appearance retention, corrosion resistance, and overall performance.
| Material | Corrosion Resistance | Aesthetic Longevity | Cost | Common Use |
|---|---|---|---|---|
| Zinc Alloy | Moderate | Medium | Low | Souvenirs, commemoratives |
| Brass | Moderate-High | High | Medium | Military, ceremonial coins |
| Copper | Low | Low (prone to green patina) | Medium | Vintage collectibles |
| Stainless Steel | High | Very High | Medium-High | Functional tokens, keyrings |
| Silver | High (but tarnishes) | High (requires polishing) | High | Premium commemoratives |
As evident from the comparison, zinc alloy sits in the mid-tier — it’s affordable and attractive but doesn’t offer the same level of long-term aesthetic retention as stainless steel or silver.
While you can't completely change the chemical nature of zinc alloy, there are proven ways to slow down or prevent tarnishing. Proper care and handling play a crucial role in maintaining the coin’s visual integrity.
Many manufacturers apply a clear epoxy resin or nickel/chrome plating to extend the life of the finish. If your coin is uncoated, you can apply a microcrystalline wax like Renaissance Wax to create a protective barrier.
Store in low-humidity environments
Use acid-free containers or capsules
Avoid PVC holders, as they release harmful plasticizers
Do not stack coins directly to prevent scratches and chemical reactions
Always hold the coin by the edges
Avoid touching the face to minimize skin oil transfer
Use cotton gloves when handling valuable or sentimental pieces
Many people are tempted to clean tarnished coins with commercial cleaners, but this can damage both the surface and the underlying alloy. Instead, use mild soap and water and pat dry gently.
By implementing these precautions, you can significantly reduce the risk of your zinc alloy souvenir coin turning or corroding.
Even with its tendency to turn under certain conditions, zinc alloy remains one of the most popular choices for souvenir coin production. Why? Because of the balance it offers between cost, customization, and quality.
Zinc alloy allows for:
Intricate 3D molds
Multi-color enamel fillings
Dual-plated surfaces (e.g., gold + silver finishes)
Unique shapes and edge designs
This makes it ideal for use in:
Tourism memorabilia
Military commemorations
Corporate gifts
Festivals and events
For bulk production, zinc alloy coins are significantly more cost-effective than silver, brass, or copper. This makes them a go-to choice for non-premium applications without sacrificing too much on quality.
Unlike solid copper or silver coins, zinc alloy is lighter and easier to carry, yet durable enough for daily handling. When plated properly, the visual appeal can rival even higher-end metals.
So while there are compromises, the benefits of zinc alloy for short-to-medium term collectibles outweigh the drawbacks for many users.
Yes, but only with mild soap and water. Avoid abrasive pads or strong chemical cleaners, which can strip the finish and accelerate corrosion.
Zinc itself doesn’t rust like iron but oxidizes, forming a white powdery substance. In alloys, this can appear as discoloration or surface dullness.
No. Some are raw or only lightly coated. Always confirm with the manufacturer if a protective layer is included.
It’s not recommended. Different metals may react in close proximity, especially in humid environments, leading to cross-contamination corrosion.
With proper care and storage, a zinc alloy souvenir coin can last 10–20 years or more without significant visual degradation.
In conclusion, yes, zinc alloy souvenir coins can turn, but this should not be a cause for alarm. Tarnishing is a natural chemical process that occurs with most metals, especially those exposed to moisture, oils, and air. However, with the right storage and care techniques, you can preserve the beauty and integrity of your coin for many years.
If you're buying or gifting a souvenir coin and are looking for a balance between affordability and design, zinc alloy remains a top-tier option. Just like any collectible, how well it holds up over time depends largely on how it's treated after it's minted.