There are a few copper electroplating methods on here, but they are either dangerous, provide very low quality results, or cost an arm and a leg. Your plated object should be a brilliant, shiny red, not blackened, and your pocket book shouldn't be hit hard by chemical costs or hospital bills.
The method I am writing about here is the copper acetate method. Rather than buying copper acetate pre-made, we will make it ourselves.
I wanted this instructable to be as easy as possible, safe as possible, and as cheap as possible.
Copper plating has a variety of uses. Aesthetically, it can be used to create a steampunk look on otherwise ill-fitting metals. Anodizing the object after plating can create brilliant, multicolored objects. Electrically, it creates a highly conductive surface for soldering or use in AC circuits (for the skin effect). It is also frequently used to prepare stubborn materials for other platings such as nickel and silver down the road.
If you like this instructable, but want a silvery finish instead of a copper finish, check out my nickel plating instructable!
https://www.instructables.com/id/High-Quality-and-safe-Nickel-Plating/
On another note, I LOVE your questions! I have noticed that a few folks are asking the same questions, so I've added a "Common Questions" step/slide/section/whatchamacallit at the end of this instructable. Take a look there to get quick answers to most of the questions you might have. If you have a new one, comment below and I'll be happy to answer it and add it to my step/slide/section/whatchamacallit :D
A quick disclaimer - copper acetate, the chemical we will be making, is poisonous. The title "High Quality (and Safe) Copper Plating" is referring more to the fact that you don't need to play with insanely powerful acids that will burn your skin or ask you to open batteries. In the concentrations we will be working with, the process is fairly safe. However, do NOT drink the solution and be sure to wash your hands after plating and properly wipe down any surfaces that come near or into contact with your plating solution. Always supervise kids. That said, enjoy!
Hongyuan International contains other products and information you need, so please check it out.
Can I plate [insert your metal here] with copper?
It depends. Certain metals play nice together, others do not. The ones that do not are called "dissimilar metals". In the picture, you'll find a table I borrowed from RFI. The table is designed to let you know when a galvanic reaction might occur causing corrosion. For our purposes, it also tells us which metals are compatible and which are not. The lower the magnitude of the number (aka the absolute value), the more compatible (ie similar) the metals will be. If you are trying to plate a metal that is not compatible, you may need to plate with nickel or another metal first. Aluminum, for example, should be plated with nickel before it can be plated with copper. You can find my nickel plating instructable here: https://www.instructables.com/id/High-Quality-and-safe-Nickel-Plating/
How do I plate non-conductive objects?
First, you need to make them conductive. You can do this with conductive paints, conductive glues, and even metal leaf (think gold leaf) as long as whatever you are coating your surface with is not water soluble. I haven't experimented much with this myself which means you will have to. Send me a message with your results and I'll post them here for others to reference.
How much voltage/current do I need?
As little as possible. The lower the voltage and current, the better results you will get. You need a minimum of 0.5V DC to plate with copper. A C or D cell battery will give you pretty decent results. If you don't have access to lower voltages, you can put the electrolyte into a big container and move your electrodes as far away from another as you can - the increase in distance will also increase the resistance of the circuit and decrease the current.
Can I use copper chloride or another electrolyte instead of making it with vinegar and such?
Yes, you can. I just like the idea of making my own chemicals. You can get root kill (which are green crystals if I recall) at your local hardware store for relatively cheap.
Can I use other acids other than acetic acid (vinegar)?
Yes.....but be careful... This instructable was written for average Joes and Jolenes, not chemists. Other acids can be significantly more dangerous as well as release some very nasty, very toxic chemicals into the air. Unless you are an experience chemist (ie you have an actual degree, not just AP Chem in high school or Chem 111 in college), I would not recommend playing with other chemicals.
Is plating coins illegal?
The first thing I want to point out is that I'm only using coins because they are everywhere and cheap by definition. The copper and nickel content make them ideal for small experiments. This isn't a "how to plate coins" instructable, coins are simply handy and recognizable. For those of you who took high school chem lab, you probably used quarters, dimes, and pennies for a couple different classroom experiments.
As far as the legality of plating coins, to my understanding, it is legal as long as you 1) Aren't removing metal from the coins with intent to sell that metal, 2) Are not trying to pass them as something they are not (ie a copper plated dime is worth 10 cents, nothing more), and 3) Aren't defacing the coins for malicious intent. As a personal disclaimer, this is MY understanding - take it with a grain of salt. If this is incorrect, I would welcome a friendly or message from the US Treasury or other qualified persons.
Why are you using a 6V lantern battery when you say that lower voltages are better?
-The difference in plating quality between low voltages (0.5VDC is the lowest you can go) and 6VDC is not much. BUT, the time it takes to plate using 6VDC is a lot less.
-If you want lower voltages, you can do so by moving your anode and cathode farther apart. This is because your electrolyte acts as a variable resistor and the square resistance of your anode and cathode create two more resistors of a fixed resistance. The further your anode and cathode are from each other, the greater the resistance of the electrolyte, the greater the voltage drop across the electrolyte, the lower the voltage between the cathode and the electrolyte directly touching it. Without taking an electronics class, this can be a little difficult to understand, so if you don't, you will just need to trust me.
-Good lantern batteries will last a very long time. They have many, many AA batteries in parallel which gives you more available juice and higher current if you want it.
-Lantern batteries are easy to clip alligator clips to and don't need battery holders.
-As the battery drains, its internal resistance will not raise significantly and its voltage will not drop much due to the highly parallel internal battery connections. This gives you more consistent results.
Can I plate Aluminum?
I would avoid it. Aluminum is just one of those metals that don't plate well. If you are looking for a corrosion-resistant finish, you can anodize the aluminum to create a clear oxide layer that is extremely corrosion resistant. If you are looking for a colored finish, you can get dyes that absorb into the oxide layer and stain it whatever color you want (this is actually what Apple and other companies do to make different colored iPods).
Can I use copper plating to keep steel parts from rusting?
No. Absolutely not. This is for a couple different reasons.
- Copper patinas (ie rusts) and can eventually flake off over time exposing microscopic and macroscopic holes through to your base metal. As salt, water, and oxygen reach the base metal, it will rust underneath your plating causing more plating to flake off and ....you get the idea.
- Copper will create a galvanic reaction (which is how most batteries work) with the iron in the steel when your object is placed in water. This will cause your steel parts to rust EVEN FASTER. If you want to test this, place a piece of copper in salty water with a piece of steel touching it. It will start rusting like crazy in a couple hours or faster.
Metal coated steel it’s a cost-efficient method of protecting steel, particularly compared to using stainless steel. It also has environmental benefits since it doesn’t produce emissions and ensures practically maintenance-free use. It’s mostly used unpainted, but if it’s painted the paint coating has good adhesion to the zinc surface.
Because of the sacrificial nature of the zinc, the metal coating provides corrosion protection also for areas of exposed steel surfaces, such as cutting edges and areas where coating has been damaged by scratches or impacts.Full corrosion protection is even achieved in areas that have been heavily formed because there is a low peeling tendency of this low-friction and tightly bonded coating.
If you want to learn more, please visit our website Color Coated Plate.
Galvanized steel is found everywhere, from nuts and bolts to power line pylons and other large-scale installations. Car bodies are nowadays fully galvanized, making them last longer without rusting. The agriculture industry is an extensive user of galvanized sheet metal and galvanized pipe for cattle gates, fences, wires, and much more.
The building industry uses a lot of galvanized steel for infrastructure such as ventilation, heating, and electrical installations. It’s also used for balconies, staircases, ladders, gutters, rails, tubing, and walkways. The aesthetic appearance is another factor which makes it a favorite material for many architects.
img]:inline [.inverted_&:hover]:text-[--txt-content-interactive-inv]">Hot dip galvanizing creates a thick, resilient layer of zinc iron alloys on the surface of a steel product. The hot dip process does not generally reduce the strength of the base metal, with the exception of high-strength steels where hydrogen embrittlement can become an issue.
In the process of hot dip galvanizing the base metal is immersed in a bath of molten zinc at a temperature of around 450 °C (842 °F). The zinc alloys with the surface of the steel, forming a matt grey surface that protects the steel from further corrosion.
Hot dip galvanized steel offers a wide protection range from Z100 to Z600 and a tight bond between the hot dip coating and the steel. That’s why zinc coatings are well suited to forming.
The composition of zinc coating consists almost entirely of zinc (>99%) and is lead free, resulting in finely crystallized zinc spangle that meets high requirements for visual appearance. The corrosion resistance provided by the zinc coating is in direct proportion to the coating's thickness. The Z600 coating (42 µm on both sides) can achieve a service life of up to 80 years.
Production of galvannealed steel sheet begins with hot dip galvanization of sheet steel. After passing through the galvanizing zinc bath the sheet steel is heated in an annealing furnace for several seconds. This makes iron and zinc layers diffuse into one another, creating zinc-iron alloy layers at the surface. The galvanizing bath contains slightly over 0.1% aluminum, added to form a layer bonding between the iron and coated zinc. Annealing temperatures are around 500 to 565 °C (932- °F).
img]:inline [.inverted_&:hover]:text-[--txt-content-interactive-inv]">Galvannealed coating (ZF) feature excellent spot-welding properties, resulting in longer electrode life and low galling on electrodes. The surface of the galvannealed steel sheet is finely structured, giving an attractive appearance to the painted surface and strong paint adhesion.
Galfan (ZA) is a zinc-aluminum alloy coating that provides excellent corrosion protection and forming properties compared to traditional zinc coating.
img]:inline [.inverted_&:hover]:text-[--txt-content-interactive-inv]">Galfan steel coating features excellent corrosion resistance compared with traditional zinc coating. This is why it can be used to achieve a longer service life for a steel part, or to replace traditional zinc coating with a thinner galfan coating, thereby simultaneously offering improved weldability and formability properties.
A bright metallic and mildly cellular-patterned surface is characteristic for galfan coating. The eutectic composition of 95% Zn and 5% Al improves the coating adhesion and enables a lamellar coating structure in micro-scale. This makes it ductile and well suited for deep drawing.
Are you interested in learning more about Galvanized T-Steel? Contact us today to secure an expert consultation!