Space is unlike any other operating environment. It exposes components to temperature swings that can range from scorching hot in direct sunlight to hundreds of degrees below zero in shadow, sometimes cycling multiple times per orbit. There’s no atmosphere to provide corrosion resistance the way it does on Earth. Radiation exposure degrades materials over time. And vacuum conditions create challenges that most engineers designing for terrestrial applications never have to think about.
What all of this adds up to is a simple truth: in space applications, a bright, polished finish means nothing if the conductivity degrades six months into the mission. Function sets the specification. Everything else is secondary.
Gold Plating: The Go-To Finish for Conductivity in Orbit
When we’re reviewing a spec for a space-grade component, gold is almost always part of the conversation. The reason comes down to one fundamental property: gold doesn’t oxidize. You can put it in a vacuum, expose it to radiation, cycle it through extreme thermal swings, and the surface will maintain its electrical performance. That stability is invaluable when you’re talking about a connector on a communications satellite that needs to carry a clean signal for ten or fifteen years without any intervention.
Why Gold Beats Silver for Space Applications
A common question we get is whether gold over silver makes sense for space applications, since silver has the highest electrical conductivity of any metal. The short answer is no. Silver tarnishes, and once it does, its conductivity degrades. You can’t walk up to the satellite and swap the connector. So for space, the reliability of gold wins out over the raw conductivity advantage of silver every time.
The Gold Over Electroless Nickel Combination
What we specify most often is gold over electroless nickel (EN). The EN underlayer handles corrosion resistance and provides a uniform, well-adhered base. The gold topcoat delivers stable, oxidation-free conductivity. Each layer has a specific job, and together they address the full range of what a space environment can throw at a component.
A Real-World Example: NASA’s GOES-R Weather Satellite
A well-known example of this approach in our history is NASA’s GOES-R weather satellite. During pre-launch testing, a gold plating failure on a component plated at a competing vendor caused a malfunction. NASA’s Goddard Space Flight Center contacted Electro-Spec to explore solutions. After technical discussions, we identified that “gold embrittlement” had compromised a solder joint. Using our controlled-depth plating system and specialized tooling, we selectively applied gold only where it was needed, holding depth accuracy to within .022 inches and achieving up to 70% gold savings. Those components were successfully plated and NASA moved forward with the launch. It’s a good illustration of something we see regularly: it’s not just about choosing gold. It’s about applying it correctly, in the right thickness, in the right location, with the right underlayer.
Electroless Nickel: The Unsung Hero of Space-Grade Corrosion Protection
While gold tends to get the spotlight, electroless nickel is quietly doing some of the most important work in the stack.
Unlike electrolytic nickel, which uses electrical current and can result in uneven thickness on complex geometries, electroless nickel deposits through an autocatalytic chemical reaction. That means the coating follows the contours of the part uniformly, whether you’re plating the outside diameter of a connector body, the inside of a deep counter bore, or a threaded surface that would create high and low current density zones in a traditional plating process. For the small, intricate components that show up frequently in aerospace assemblies, uniform coverage is essential.
EN provides excellent corrosion resistance, good hardness, and predictable coating thickness across the entire part surface. For space applications where the substrate is typically copper or brass, EN acts as both a barrier layer and an adhesion promoter for the gold topcoat above it.
High-Phosphorous Electroless Nickel: The Non-Magnetic Alternative
For sensitive electronic applications, high-phosphorous electroless nickel (HPEN) is worth knowing about. Standard nickel is magnetic, and in RF and microwave designs, even small amounts of magnetic interference can disrupt performance. HPEN, with phosphorus content at or above 10%, is essentially non-magnetic, making it a strong alternative underlayer for navigation systems, communication satellites, or any application where magnetic neutrality matters.
And one last thing: in space applications, matte nickel finishes are the norm, not the exception. Nobody is specifying a bright finish for a satellite component. Function drives every decision, and the finish is no different.
Process Matters: How Electro-Spec Handles the Challenges of Electroplating for Space
Specifying the right materials is half the equation. The other half is execution, and in plating for space, how parts are handled from arrival through final inspection is just as important as the chemistry in the tank.
Space-grade components are often inspected at magnifications of 20x, 30x, and even 50x. A scratch invisible to the naked eye can result in a rejected part. When customers are examining components under a microscope and scrapping them over marks that are genuinely hard to see at normal magnification, the only solution is a process that treats every part as if it’s the most critical thing you’ve ever touched, because it very likely is.
Vacuum Vapor Degreasing: The First Step in Getting It Right
Our vacuum vapor degreasing operation reflects that philosophy. Before plating begins, parts are cleaned to a molecular level, removing contaminants that could compromise adhesion or coating integrity. For safety-critical aerospace components, this isn’t optional. It’s the baseline standard that makes everything downstream perform reliably.
How SBE Plating Solves the Complex Geometry Problem
For small, complex-geometry components, our Spouted Bed Electrode (SBE) plating process addresses challenges that barrel and rack plating simply can’t. Parts are continuously agitated with ultrasonic action while fresh plating electrolyte flows through the chamber in real time, ensuring uniform coverage even in counter bores, deep inside diameters, and threaded features where conventional plating produces inconsistent results. SBE is available in gold, nickel, electroless nickel, and copper, so if your component needs gold over EN with complex geometry, SBE can handle both phases of that process.
Backing all of this up is our on-site metallurgical lab, which gives us the ability to perform hardness testing, cross-sectioning, SEM/EDS analysis, and failure analysis without sending samples out. When a question arises about a coating on a critical aerospace program, we solve it with data, on our timeline.
Electro-Spec’s Track Record in Space Applications
We’ve been doing this for over six decades, and the aerospace work we’ve been privileged to be part of reflects the kind of trust that only gets built through consistent, reliable performance over a long period of time.
Parts we’ve plated have gone into the Mars Rover, Space Shuttles, space intelligence and defense systems, and multiple NASA missions, including the GOES weather satellite series. Our orders for aerospace, medical, and defense applications have been growing steadily, and the demands those customers bring with them have only gotten more exacting.
Every job that comes through our facility carries the same expectation: no bad parts leave. We understand that a component that passes inspection at one of our facilities may end up hundreds of miles above the Earth.
Getting Your Space-Grade Plating Specifications Right
Whether you know your component is going to space or you’re simply working to a demanding aerospace spec, the principles are the same: choose materials for function, not appearance; specify your underlayer for corrosion resistance and adhesion; and partner with a plating shop that has the process controls and track record to back up what’s on your print.
If you’re specifying components for aerospace or space applications and want to talk through your plating requirements, our engineers are ready to dig into the details with you. We review prints, discuss process options, and help customers develop specifications that will actually perform in the field, not just pass inspection on the first go. Reach out to our team to get started, or request a quote and tell us what you’re working with.