Zinc Passivation Vs. Zinc Electroplating: What Are The Differences?
In this blog, we’ll be explaining the difference between zinc passivation and zinc electroplating. Knowing the difference between these two processes is vital for choosing which method is the best option for your current project, and based on your goals.
Before we begin exploring the differences of passivation and electroplating it’s important to understand what each of these processes entail, and what they are commonly used for.
Zinc Electroplating – This process involves applying a thin layer of zinc to a metal surface through an electrochemical process. Zinc plating provides an extra layer of protection for the original metal, shielding it from corrosion.
Zinc Passivation – The zinc passivation process is achieved using chemical solutions to protect zinc-coated metals and to improve the corrosion resistance of zinc. This extends the lifespan of the coating as an extra step.
Durability
The first difference between zinc passivation and electroplating processes are their ability to withstand harsh conditions. Both methods are used to protect the metal underneath, but zinc electroplating is generally more durable than passivation.
This is because of the zinc plating’s thicker and more wear-resistant coating, meaning it provides longstanding protection to the base metal. This means electroplating is generally the right choice if you need to protect metal that is going to be exposed to outdoor and marine elements.
Maintenance
Another difference between the two is that zinc electroplating and passivation have different levels of maintenance. The metal coating created through the passivation process is thinner than electroplating. This makes it easier to maintain, as there isn’t such a thick protective layer. If the zinc passivation layer becomes damaged, it can still maintain its level of protection. However, electroplating cannot regenerate itself like the passivated layer and will need repairing more frequently.
Aesthetic
Zinc plating is known for looking more aesthetically appealing than a passivated coating. This is because electroplating produces a more uniform and shinier surface to cover the metal. The thin layer of zinc created by the plating process has a brighter and more appealing look in comparison to metal that has a passivation coating.
An electroplating finish usually results in a polished or mirror-like appearance, whereas the result of zinc passivation is more likely to leave a duller and matte finish that is usually considered less visually appealing.
Process
The passivation process is generally less time-consuming than zinc electroplating; this is because electroplating involves multiple steps such as cleaning, plating, rinsing, and sometimes added treatments. Plating can become even more time-consuming depending on the thickness of the coat of zinc you need. Zinc passivation involves a much thinner layer than electroplating, and the process includes dipping the plated part in a passivating solution for a short period, which is followed by rinsing and drying.
To learn more about our zinc passivation and electroplating services, please don’t hesitate to get in touch directly. Give us a call on 01202 677939 and we’ll be happy to provide a free quote. You can also browse our website to see the full range of services we offer.