Engineering

Electroplating

Electroplating works by using an electrolytic cell to deposit a thin layer of metal onto the surface of another object. In this process, the object to be coated, called the substrate or workpiece, acts as the cathode, while the metal used for the coating acts as the anode. Both are immersed in an electrolyte solution containing metal ions. When an electric current passes through the solution, the metal ions move toward the cathode, where they gain electrons and are reduced. This reaction forms a thin, uniform layer of metal on the surface of the substrate.

Principle of Electroplating

Electroplating 3D printing

Now, relating this to 3D printing, a process known as “electroplating 3D printing” or “electrochemical 3D printing” can be used to create complex metal parts with intricate details. In 3D printing, a process known as “electroplating 3D printing” or “electrochemical 3D printing” can be used to create complex metal parts with intricate details. This process combines traditional 3D printing techniques with electroplating to achieve the desired result.

There are 5 steps when electroplating 3D printed parts :

Printing the Base Object: First, the base object is created using traditional 3D printing techniques, such as Fused Deposition Modeling (FDM), Stereolithography (SLA), or Selective Laser Melting (SLM). This creates a substrate with the desired shape and structure.
Preparation: The printed substrate is carefully cleaned and prepared for the electroplating process. This might involve cleaning the surface, removing any residual printing materials, and ensuring a smooth and even surface for plating.
Electroplating: The prepared object is then immersed in an electrolyte bath containing metal ions from the desired plating material. An electrical current is applied, causing the metal ions to adhere to the surface of the substrate, gradually building up a layer of metal.
Control and Precision: The electroplating process can be controlled to achieve specific layer thicknesses and even coverage. This allows for precise control over the final dimensions and properties of the 3D printed part.
Finishing: Once the desired thickness of the plated layer is achieved, the electroplated object is carefully removed from the bath. Additional post-processing steps, such as polishing and coating, might be carried out to enhance the appearance and properties of the final part.

By combining 3D printing and electroplating, manufacturers can create objects with intricate designs, improved mechanical properties, and high-quality surface finishes that might be challenging to achieve through traditional manufacturing methods alone. This technique opens up possibilities to create functional and aesthetic metal parts for various applications, ranging from aerospace components to custom jewelry.

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Examples

Here are a few examples of how electroplating can be used to enhance the properties of 3D-printed plastic parts. They show how this process can transform basic components into high-performance objects, suitable for a variety of applications, and at a lower cost:

Improved Mechanical Properties:

Example 1: Reinforced Structural Components

Scenario: Imagine you’ve 3D printed a plastic gear for a machine, which is cost-effective but lacks the required strength and durability for heavy-duty applications.

Plastic gear

Solution: Through electroplating, you can selectively deposit a layer of a stronger metal like nickel or chrome onto the plastic gear. This additional metal layer significantly enhances the mechanical strength, wear resistance, and overall durability of the gear, making it suitable for demanding industrial environments.

Example 2: Reinforced Support Brackets

Scenario: Let’s say you’ve created plastic brackets for lightweight shelves, but you want to make them stronger to support heavier loads.

Support brackets

Solution: By using electroplating, you can add a layer of metal like aluminum or copper onto the plastic brackets. This metal layer significantly enhances the mechanical strength and load-bearing capacity of the brackets, making them suitable for applications where robustness is crucial.

Improved Chemical Properties:

Example 1: Corrosion-Resistant Fittings

Scenario: Suppose you’ve designed plastic connectors for a chemical processing setup, but standard plastics are susceptible to chemical corrosion over time.

Plastic connectors

Solution: By electroplating a layer of a chemically resistant metal such as stainless steel onto the plastic fittings, you can effectively shield them from chemical reactions and prevent corrosion. This added layer ensures the longevity and safety of the connectors in aggressive chemical environments.

Example 2: Chemical-Resistant Valve Components

Scenario: Let’s say you’re developing a chemical processing system that requires precise control over the flow of corrosive liquids. However, the standard plastic valves are prone to chemical degradation, leading to leaks and system failures.

Valve Components

Solution: By applying electroplating, you can deposit a layer of chemically resistant metal such as PTFE (polytetrafluoroethylene) onto the plastic valve components. PTFE is known for its exceptional chemical resistance. This electroplated layer forms a protective barrier, preventing the corrosive chemicals from interacting with the underlying plastic. As a result, the valves remain functional and leak-free even in the presence of aggressive chemicals, ensuring the reliability and safety of your chemical processing system.

Example 1: Custom Electronics Enclosures

Scenario: Let’s say you’ve 3D printed a housing for an electronic device using non-conductive plastic, but you need the enclosure to also provide electromagnetic shielding.

Electronics Enclosures

Solution: Electroplating a layer of a conductive material like copper onto the plastic housing allows it to not only shield against electromagnetic interference but also provide a grounding path. This electroplated layer can turn a non-conductive plastic housing into a functional electronics enclosure with both mechanical protection and electromagnetic shielding capabilities.

Example 2: Enhanced Sensor

Scenario: Suppose you’ve 3D printed a housing for an electronic sensor, but the plastic material used isn’t conductive, limiting the sensor’s functions.

Solution: By electroplating a thin layer of conductive metal like silver onto the plastic housing, you create a conductive casing that enables better transmission of electrical signals. This transforms the housing into a functional component for the sensor, facilitating data collection and transmission.

Aesthetics:

Example 1: Luxury Jewelry Enhancement

Scenario: Imagine you’re a jewelry designer creating intricate pieces with delicate details. While you’ve crafted these pieces using cost-effective materials like resin or plastic, you want to elevate their appearance to a luxurious level that matches their design.

Luxury Jewelry

Solution: Through electroplating, you can add a layer of precious metal like gold, silver, or platinum onto the plastic or resin jewelry components. This electroplated layer enhances the aesthetics by giving the pieces the lustrous and captivating appearance of the chosen precious metal. The electroplated metal layer not only adds value but also enhances the visual appeal, making the jewelry pieces desirable and eye-catching to potential customers.

Example 2: Volkswagen using electroplating for metal hubcaps.

Scenario: With its “Type 20” van concept, Volkswagen has modernized its 1962 VW microbus, giving a glimpse of what next-generation automotive engineering will be like. VW designers worked with Autodesk for the generative design of several structural components, including a set of particularly evocative cast aluminum rims. These wheels required hubcaps that would be emblematic of VW, yet at the same time go well with the organic shapes of the rims.

Volkswagen using electroplating for metal hubcaps

Solution: Print the hubcaps on a Formlabs desktop SLA 3D printer with Clear Resin, then electroplate them with a hundred microns (0.004 inch) layer of nickel. The parts had the look and feel of metal and, what’s more, could be manufactured at the same pace as the design evolved, with minimal form constraints.

(https://formlabs.com/fr/blog/volkswagen-galvanoplastie-impression-3d/)

Other examples of company applications:

General Electric:

GE uses electroplating for aircraft engine components. The process enhances the durability and resistance of these parts to extreme temperatures and conditions.