Gold plating is used across UK industry to protect electrical contacts from corrosion and keep connections reliable, most commonly in electronics, aerospace, defence, medical devices and telecommunications.
It’s also used decoratively in jewellery and giftware, although industrial applications account for the more technically demanding work.
With gold prices high and supply chains under pressure, businesses that buy plated components are paying closer attention to how the process works and what drives cost. Here’s what to know.
What Is Gold Plating?
In practical terms, gold plating is the process of applying a very thin layer of gold onto the surface of another metal, usually copper, brass or a nickel coated part.
The base metal provides strength and shape, while the gold provides a stable, conductive surface.
The most common method is electroplating. The component is cleaned thoroughly, then placed in an electrolyte solution containing gold.
An electrical current draws gold onto the surface, building up a coating to the required thickness. Some applications use electroless immersion instead, where gold deposits through a chemical reaction without an external current.
Coatings are often measured in fractions of a micron. Even at that thickness, the gold layer provides most of the performance benefits of the metal.
Why Do Businesses Use Gold Plating?
The main reason is reliability. Gold doesn’t rust, tarnish or oxidise in normal conditions.
Oxidation on other metals increases electrical resistance, which can cause signal problems and component failure. A gold surface stays clean and conductive for years.
Gold is also highly conductive, resistant to wear from friction (known as fretting) and handles heat well. It’s malleable too, which makes it possible to lay down very thin, even layers and keep material costs under control.
Which Industries Use It Most?
Electronics is the biggest user. Circuit board contacts, connector pins, switches and semiconductor components all commonly carry gold finishes.
Aerospace and defence rely heavily on gold plating for connectors and components that must work in extreme temperatures, high vibration and humid conditions.
Given the size of the UK’s aerospace and defence manufacturing base, this is a significant area of demand.
Medical device makers use gold for sensors, electrodes and some implantable parts, partly because it’s biocompatible. Telecom operators and data centres use it in high speed connectors, where signal integrity is critical.
How Much Does Gold Plating Cost?
There’s no fixed price, because cost depends on a handful of variables. The market price of gold is the biggest, and it moves daily. Coating thickness comes next, since a thicker layer uses more metal.
The surface area being plated, the complexity of the part and whether selective plating is needed all affect labour and setup time.
Volume matters as well. Larger batches usually bring the unit cost down, especially where barrel plating can be used to process many small parts at once. Some suppliers offer fixed pricing on longer contracts to help buyers manage precious metal volatility.
Businesses should also allow for testing and certification. Aerospace, defence and medical work often requires documented thickness measurements, adhesion testing and full traceability, all of which add to the overall price.
Hard Gold vs Soft Gold: What’s the Difference?
Soft gold is close to pure and is used where components need to be wire bonded or soldered, such as in semiconductor packaging.
Hard gold contains small amounts of cobalt or nickel, making it more durable. It’s typically used on connectors and contacts that are plugged and unplugged often. Hard gold is slightly less conductive but lasts much longer under wear.
Is Gold Plating the Same as Solid Gold?
No. A gold plated part has only a thin surface layer of gold, while solid gold items are made entirely from the metal or a gold alloy. Solid gold is rarely used for industrial parts because of its cost and softness.
Plating gives manufacturers the surface benefits of gold without the expense or the mechanical drawbacks of making the whole part from it.
What Should Buyers Check Before Choosing a Supplier?
Quality accreditation is a good starting point. ISO 9001 for quality management and ISO 14001 for environmental management are widely expected in industrial supply chains.
Compliance with REACH and RoHS regulations is important for components sold into UK and EU markets.
Buyers should also confirm that the supplier can meet any sector specific standards required, such as aerospace or military specifications.
It’s worth asking about lead times, capacity and whether the supplier can handle both small prototype runs and full production volumes.
Finally, check how the supplier handles pricing when gold moves. Clear terms on metal surcharges or fixed price agreements help avoid surprises on invoices and make budgeting far easier.
How Long Does Gold Plating Last?
That depends on thickness, the base metal and how the part is used.
A thin coating on a rarely touched contact can last the lifetime of the product, while a connector that’s plugged in hundreds of times a year will need a thicker, harder layer to avoid wearing through to the metal underneath.
Is Gold Plating Worth the Cost?
For most industrial users, yes. The cost of a thin gold layer is usually small compared with the cost of a failed component, a product recall or downtime on a production line.
Where reliability is critical, gold plating remains one of the most dependable ways to protect electrical connections over the long term.
