The short answer
Yes, aluminium can be chrome plated, and no, it is not the same job as chroming steel. The metal behaves differently, it needs different preparation, and the results depend far more on what the part is made of and how it was made than on the plating itself.
It is also the case that a good number of people asking this question would be happier with a polished finish than a plated one. Below is what actually happens with aluminium, so you can work out which camp your parts fall into. If you are unsure, send us photographs and we will tell you.
Why aluminium is different from steel
Aluminium grows an oxide film the moment it meets air. That film re-forms in seconds, faster than you can get a part into a tank, and nothing will bond reliably to it. Steel has no equivalent problem, which is why plating steel is comparatively straightforward.
Getting a durable deposit onto aluminium therefore needs a different preparation route, in which the oxide is removed and immediately replaced with a thin sacrificial layer that plating will key to, before the usual copper, nickel and chrome layers are built up. Get that first stage wrong and the finish will look perfect for a while and then lift, blister or peel in sheets.
This is the single biggest reason why chrome on aluminium fails, and why it is not a job for a home kit or a general workshop.
Cast aluminium is the real problem, not aluminium itself
Wrought and billet aluminium, the material of extruded sections and machined parts, is dense and behaves reasonably well. Castings are a different matter.
Cast aluminium is porous. Those pores hold the process solutions used during preparation and plating, and however well a part is rinsed, some of it stays in there. Weeks or months later it bleeds back out through the finish and stains or blisters it from behind. On a sand-cast part with a rough surface, there is also the problem that porosity has to be polished out before anything can be plated, and polishing into a casting can open up more of it.
That is why the honest answer for cast items such as engine cases, carburettor bodies, clutch covers, gearbox castings and many older cast fittings is usually that they should be polished rather than plated.
Satin and sateen chrome on aluminium
A lot of the enquiries we get about aluminium are not really asking for a mirror. They are asking for the soft, even, low-lustre finish seen on architectural fittings, lighting, interior trim, and modern hardware, which is a satin or sateen chrome rather than bright chrome.
Satin finishes are worth understanding for one practical reason: the texture comes from the preparation, not the chrome. The surface is finished to a consistent matt or brushed state before plating, and the plated layers follow it. That means a satin finish will not hide anything, and an inconsistently prepared part will show as patchiness in daylight. It also means a satin finish cannot be produced by plating a mirror-polished part, and a mirror cannot be produced from a satin one without going back to the beginning.
We offer both bright chrome and sateen chrome finishes. If you are matching existing fittings, send one with the job if you possibly can, because satin covers a wide range of finishes and a sample removes the guesswork.
The alternative most people actually want: polished aluminium
Aluminium takes a mirror polish exceptionally well. Polished properly, it is bright, deep and, on the right part, indistinguishable to most eyes from chrome at arm's length. It is also correct on components that were never chromed when the vehicle was built, which matters if you are restoring rather than customising.
The trade-off is honest and worth stating: polished aluminium will dull over time and needs occasional attention, whereas chrome does not. For engine bay parts, show cars and anything that gets wiped over regularly, that is usually an acceptable exchange. For parts that live out in weather and never get touched, it is less so.
We polish aluminium alongside brass, copper, stainless and mild steel in the same workshop, so a mixed box of parts can be sorted into what should be plated and what should be polished before any work starts. Engine covers, carburettors and trim are regular work on the polishing side.
Why ask us about your aluminium parts
- Chroming since 1981: established by Doug Taylor, with three generations of the family involved today.
- Plating and polishing under one roof: we can tell you which route suits a part instead of pushing everything down one of them.
- Every item hand-wired, stripped, prepared and finished in our own workshop in Weston-super-Mare, to British Standards.
- Fit4Chrome accredited: recognised for meeting the highest industry standards in quality, safety and performance.
- Clear guarantee terms: our twelve month electroplating guarantee excludes aluminium and die cast parts, so we explain what to expect from your part before any work starts. The full terms are on our Quality Assurance page, and parts go back by insured courier anywhere in the UK.
What about boat and marine fittings?
Marine aluminium deserves a word of caution. Salt water is unforgiving, and any break in a plated surface on aluminium, from a chip, a scratch, or a fixing hole, gives corrosion a route underneath where it spreads out of sight. For fittings that live in a marine environment, talk to us about the specific part rather than assuming chrome is the right protection. Sometimes it is, and sometimes polished stainless or a different plated finish will serve you far better.
What to send us
For any aluminium enquiry, photographs plus three pieces of information get you a useful answer quickly:
- What the part is and what it came off, which usually tells us whether it is cast or wrought.
- Rough dimensions and weight.
- The finish you are picturing, bright or satin, and whether it needs to match something you already have.
We will come back to you with a budgetary estimate, a timescale, and an honest view on whether plating or polishing is the better route for that particular part. Where a part is not a good candidate for plating, we will say so rather than take the job on and hope.
Ask us about your parts
Email photographs of your aluminium parts or call us on 01934 820 454 and we will tell you what is realistic.
FAQs About Chrome Plating Aluminium
Can aluminium be chrome plated?
Yes, but not in the same way as steel. Aluminium forms an oxide film within seconds of meeting air and nothing bonds reliably to it, so the oxide has to be removed and immediately replaced with a sacrificial layer before copper, nickel and chrome are built up. If that first stage is not done correctly the finish lifts or blisters later. Each part is assessed individually.
Why does chrome plating fail on cast aluminium?
Cast aluminium is porous. The pores trap process solutions during preparation and plating, and however thoroughly a part is rinsed some remains, bleeding back out weeks or months later and staining or blistering the finish from behind. Cast items such as engine cases, carburettor bodies and clutch covers are usually better polished than plated.
Is polished aluminium as bright as chrome?
Polished aluminium is very bright and, on the right part, hard to tell from chrome at normal viewing distance. The difference is durability: polished aluminium dulls over time and needs occasional attention, while chrome does not. Polishing is also the correct finish for parts that were never chromed when the vehicle was built.
What is satin chrome on aluminium?
Satin or sateen chrome is a soft, low-lustre finish rather than a mirror. The texture comes from how the surface is prepared before plating, not from the chrome itself, so the preparation has to be consistent or the finish looks patchy. If you are matching existing fittings, send a sample with the job, because satin covers a wide range of finishes.
Should marine and boat fittings in aluminium be chrome plated?
Not automatically. In salt water, any break in a plated surface on aluminium, such as a chip, scratch or fixing hole, lets corrosion spread underneath where it cannot be seen. Marine fittings should be discussed part by part, as polished stainless or a different plated finish is sometimes the better answer.
Get in touch
Give your treasured items a new gleaming look, call us on 01934 820 454 or email us to discuss your project.