Metal Plating: Working Principle, Types and Techniques

Product designers and manufacturers utilize various metal finishes for custom parts. Most of these finishes enhance products’ physical appeal while others improve functionality. Metal plating offers a distinct combination of properties that make custom products more suitable for the intended application.

Metal plating is a practical post-production finishing option and a critical aspect of modern technology, which makes it ideal for various applications and compatible with different metals.

This guide delves into the surface plating surface finish process and its working principles, exploring this technique’s fundamental elements and how to achieve the best outcomes!

Metal plating is a surface finishing treatment that involves depositing metals such as nickel, copper, gold, or other metals on the substrate or workpiece. It is commonly used to coat metal and other materials to make them aesthetically appealing and protect them from corrosive elements by forming a thin layer of metal over them.

This finish can be achieved with electroplating or electroless plating. Metal plating offers extensive benefits, including reduced chances of corrosion, decreased friction, improved conductivity, improved surface roughness, better paint adhesion, solderability, and strength.

Metal plating custom products involve a series of pretreatment and post-treatment steps. While there are different metal plating techniques, we will explore the basic procedures of electroplating in this section:

1. STEP I: Pretreatment

   The pretreatment ensures the removal of all contaminants on the metal surface that may complicate the plating process. This step involves cleaning, rinsing, and other pretreatment that help remove harmful contaminants from the plating surface. Although some base materials require only one cleaning, others may require two or more to ensure the removal of all contaminants.

2. STEP II: Determine the Effectiveness of the Cleaning

   The ideal plating technique depends on the requirements of your custom parts. Also, it determines how clean your plating surface should be before the process occurs. For instance, you need to remove only bulk soil and dirt with some CAD plating techniques, while others require removing oil and grease. Therefore, you can check your substrate’s cleanliness with a water break test, reflectivity, or wipe test to ensure the surface of the base material is free from any residue.

3. STEP III: Prepare the Plating Station

   Since the focus is on electroplating, you need a tank, a rectifier or other source of direct current, an anode, a cathode, and a compatible plating solution to prepare a plating station for your products.

4. STEP IV: Plating

   Metal deposition begins once you turn on the electrical current. However, to achieve a thicker finish, you must expose the plating surface to the current longer. Temperature, immersion durations, voltage levels, etc., are variables to consider when plating substrates.

5. STEP V: Post-treatment

   Post-treatment cleaning is critical after creating the preferred deposition on the products. More so, electrolytic polishing effectively improves manufactured components’ corrosion-resistant properties.

6. STEP VI: Waste Disposal

   The metal plating finish creates heavy metals, which are often harmful due to their extreme toxicity levels. Therefore, pretreating the plating wastewater before disposal is an efficient disposal method.

There are various metal plating techniques, each with unique procedures and outcomes. Below are typical metal plating techniques used in different industries: