One of the most common questions we receive from customers is:
- Do enamel pins rust?
- Will gold-plated pins tarnish over time?
- Why do some pins stay shiny for years while others start to discolor after a few months?
- What makes the quality of custom pins vary so much between manufacturers?
As a custom pin manufacturer with over 17 years of production experience, we can give a straightforward answer:
Whether an enamel pin will rust largely depends on the quality of its electroplating, not just the base metal or the plating color.
Take iron pins as an example. Iron naturally oxidizes when exposed to moisture and oxygen. Without proper surface protection, rust can develop quickly, especially in humid environments.
This is where electroplating plays a critical role.
A professionally electroplated pin is protected by multiple layers of metal coating that act as a barrier between the base metal and the outside environment. These layers significantly improve corrosion resistance, durability, and long-term appearance.
In our factory, we’ve inspected countless low-quality pins that developed issues such as:
- Yellowing or discoloration
- Dull and faded plating
- Oxidation around the edges
- Peeling metal finishes
- Visible rust spots
In most cases, these problems are not caused by the metal itself. Instead, they result from insufficient plating thickness, poor surface preparation, or inconsistent process control during manufacturing.
That’s why, for a high-quality custom pin, electroplating is far more than a decorative finish. It is one of the most important factors determining how the product will look and perform years after production.
Electroplating Is Not Paint — It’s a Chemical Process
Many people assume electroplating simply means adding color to a metal surface.
In reality, electroplating is an electrochemical process that deposits a thin layer of metal onto the surface of a product.
During production, metal parts are immersed in a plating solution and connected to an electrical current. Metal ions in the solution are attracted to the surface of the pin, where they form a dense and uniform coating.
Although the coating is usually only a few microns thick, it provides several critical benefits:
- Prevents rust and oxidation
- Improves corrosion resistance
- Enhances surface brightness
- Increases wear resistance
- Creates a premium metallic appearance
For custom enamel pins, the electroplating layer serves as the first line of defense against environmental damage.
How Many Plating Layers Does a Quality Pin Need?
Many customers believe plating is a single-step process.
In reality, high-quality custom pins typically use multiple plating layers to achieve both durability and appearance.
Layer 1: Copper Plating
Copper plating helps smooth out microscopic imperfections on the metal surface.
Without this foundation layer, subsequent plating may appear rough or uneven. Copper creates a more uniform base, allowing later layers to achieve a cleaner and brighter finish.
Layer 2: Nickel Plating
Nickel plating is the primary protective layer in the plating system.
Its key functions include:
- Improving hardness
- Increasing wear resistance
- Enhancing corrosion resistance
- Preventing oxidation of the base metal
The premium metallic appearance often associated with high-quality pins is largely the result of a well-executed nickel layer.
Without nickel plating, a pin’s resistance to moisture and corrosion is significantly reduced.
Layer 3: Decorative Finish
The final plating layer creates the color customers see.
Common plating finishes include: Gold, Silver, Nickel, Black Nickel, Dye Black, Antique Gold/Silver/Bronze/Copper, Matte Gold/Silver/Bronze/Copper, Pearl Silver, etc.
Different plating solutions, temperatures, current densities, and processing parameters can all affect the final color and texture.
Why Do Some Enamel Pins Rust?
From our manufacturing experience, the most common causes are:
1. Plating Thickness Is Too Thin
If the plating layer is insufficient, moisture and oxygen can eventually reach the base metal, leading to oxidation and rust.
2. Poor Surface Preparation
Before plating, all oil, dust, and contaminants must be completely removed.
Improper cleaning can reduce adhesion between the plating layer and the metal surface, resulting in peeling or flaking.
3. Inconsistent Process Control
Electroplating requires precise control of:
Chemical concentration
Solution temperature
Electrical current
Processing time
Poor control of any of these variables can negatively affect the final quality.
4. Incomplete Plating Coverage
Deep recesses, sharp corners, and complex geometries can sometimes receive less plating coverage.
These areas are often the first locations where oxidation begins.
FAQ
What plating colors are available for custom pins?
Popular options include:
- Gold
- Silver
- Nickel
- Black Nickel
- Dye Black
- Antique Gold, Antique Silver, Antique Bronze, Antique Copper, Antique Tin
- Matte Gold, Matte Silver, Matte Nickel, Matte Copper
- Pearl Silver
Other custom finishes may also be available depending on the project requirements.
How many plating layers are typically used?
For most high-quality custom pins, the plating structure includes:
Copper Plating → Nickel Plating → Decorative Finish
This multi-layer system provides both durability and appearance.
Are pins plated before or after coloring?
It depends on the pin type.
Soft enamel pins are plated before coloring, while hard enamel pins are colored before plating. This is also one reason why antique finishes are generally not recommended for hard enamel pins.
For a detailed explanation of the enamel pin manufacturing process, read our guide.
Final Thoughts
Electroplating is one of the most critical processes in custom pin manufacturing.
It not only determines the final color and appearance of a pin but also directly affects its corrosion resistance, durability, and lifespan.
At Enamel Pin Custom, every production batch undergoes strict plating controls, including plating thickness monitoring, solution management, process parameter verification, and quality inspections.
Because we believe that quality is more than a manufacturing standard—it’s a commitment to our customers.
