Common Metal Plating Option Properties

Close-ups of the following plating options:

Top left: Bright Tin; top right: Matte Tin; bottom left: Tin/Lead; bottom right: Nickel.

Understand your options.

While designing your busbar or electrical component, it’s important to consider your plating options. Plating is important for both the performance and lifetime of the base metal. Each plating option comes with it’s own advantages. Depending on your application of busbars or electrical components, you may prefer one option over another.

We commonly plate for all stages of the power cycle from generation to storage, including: data center OEM’s, industrial EV, telecommunication, and industrial battery. Each application has its own needs and preferred electrical properties. Data centers need conductivity and thermal resistance, whereas almost everything can benefit from corrosion protection and wear resistance.

This article aims to inform you on differing use cases for several electroplating options. As you read, keep in mind the conditions your busbar or electrical component will live in, what it’s connected to, and the demands it needs to live up to.

Definitions

Conductivity

Conductivity describes a material's ability to transfer electrical current with minimal resistance, helping ensure reliable power transmission and optimal equipment performance. In power distribution applications, higher conductivity allows electricity to flow more efficiently, minimizing energy loss and improving overall system performance. Selecting the right plating can help maintain strong electrical performance while meeting the demands of the application.

Thermal Resistance

Thermal resistance is the ability to absorb and dissipate heat away from critical electrical or electronic systems, helping maintain safe operating temperatures and improve reliability. A component with strong thermal resistance is also known as a heat-sink. Copper is one of the highest-rated metals for thermal resistance. Thermal resistance works to limit electrical resistance, prevent component damage, maximize conductivity, and improve system longevity. As electrical systems generate heat, heat sinks help keep temperatures under control. By moving heat away from critical areas, they support efficiency, reliability, and long-term equipment durability.

Wear resistance

Wear resistance is a material's ability to withstand friction, abrasion, and repeated contact without excessive degradation. A finish with strong wear resistance helps protect component surfaces from mechanical wear, supporting longer service life in demanding applications.

Contact resistance

Contact resistance refers to the resistance encountered when electrical current passes through the connection point between two conductive surfaces. Lower contact resistance helps improve electrical efficiency and reduce heat generation. Even when two conductive components are connected, a small amount of resistance exists at the interface. Minimizing contact resistance helps ensure dependable electrical performance and reliable power transfer. Proper plating selection can help reduce resistance at contact points, improving performance and system reliability.

Corrosion resistance

Corrosion resistance helps prevent the deterioration of metal surfaces caused by moisture, chemicals, oxidation, and environmental exposure. Harsh operating conditions can impact the longevity of electrical components. Electroplating can help shield critical surfaces from environmental damage, improving durability and reliability. Proper plating can significantly extend component life and performance by reducing oxidation and material degradation, helping to preserve busbar functionality and reliability over time.

Etch resistance

Etch resistance is a material's ability to withstand chemical etching, cleaning processes, and surface treatments without excessive degradation or loss of material. Strong etch resistance helps protect critical surfaces during manufacturing and processing operations. In applications where components are exposed to chemical treatments, a plating with good etch resistance can help maintain dimensional accuracy, surface integrity, and overall product quality. Selecting the appropriate plating can help ensure consistent performance throughout manufacturing while preserving the desired surface characteristics.

Whisker prevention

Whisker prevention refers to reducing the formation of microscopic metal filaments, known as whiskers, that can grow from certain plated surfaces and potentially cause electrical shorts or failures. Whisker prevention strategies help improve long-term reliability in electrical and electronic applications. Proper plating selection and process control can help minimize whisker formation and reduce the risk of electrical disruption.

Solderability

Solderability is the ability of a surface to readily accept and form a strong bond with solder during assembly. Good solderability helps create reliable electrical and mechanical connections. For components requiring soldered connections, solderability is critical. It measures how easily solder wets and bonds to a surface, helping ensure consistent manufacturing results and dependable connections. Surface finishes with strong solderability support efficient assembly processes and long-term product performance.

Grain uniformity

Grain uniformity refers to the consistency and even distribution of microscopic crystal structures within a plated surface. A uniform grain structure helps promote consistent mechanical, electrical, and protective properties across the entire component. During the electroplating process, grain size and distribution can influence surface appearance, wear performance, corrosion resistance, and reliability. Plating with high grain uniformity help create a more consistent finish, reduce performance variations, and support dependable long-term operation in demanding applications.

Top 3 options for each property:

Conductivity

1. Silver

2. Matte tin

3. Bright tin

Thermal resistance

1. Silver

2. Tin on Aluminum

3. Zinc

Wear resistance

1. Electroless Nickel

2. Nickel

3. Bright tin

4. Matte tin

5. Tin on Aluminum

Contact resistance

1. Silver

2. Tin on Aluminum

3. Bright tin

Corrosion resistance

1. Zinc

2. Nickel

3. Matte tin

ETCH RESISTANCE

1. Tin/lead

Whisker prevention

1. Electroless Nickel

2. Nickel

3. Silver

Solderability 

1. Tin/lead

2. Silver

3. Matte tin

GRAIN UNIFORMITY

1. Bright Tin

2. Electroless Nickel

Plating material properties

Bright Tin

• Conductivity

• Corrosion resistance

• Contact resistance

• Solderability

• Grain uniformity

Matte Tin

• Conductivity

• Corrosion resistance

• Thermal resistance

• Solderability

Tin/Lead

• Solderability

• Ductility

• Etch resistance

• Whisker prevention

Nickel

• Corrosion resistance

• Wear resistance

• Whisker prevention

• Cost effectiveness

Tin on Aluminum

• Thermal resistance

• Contact resistance

Electroless Nickel

• Wear resistance

• Corrosion resistance

• Grain uniformity

Silver

• Conductivity

• Thermal resistance

• Contact resistance

• Solderability

• Whisker prevention

You want to be sure you’re making the right choice for your project. The last thing you need is a technical issue slowing rollouts, or something unexpected happening to setups a couple of years in. You want a manufacturer that will take time during NPI to understand your project, has refined DFM, and will suggest the best courses of action for project longevity. Talk with our team so we can better understand your project, and help guide you on which base metal and finishing options would be best.

If you have any questions about our electroplating options for copper or aluminum bus, our team would be more than happy to talk to you about your project and it’s requirements. Get connected with us today, and we’ll get you connected as soon as possible.