Learn how to anodize titanium at home using only a few simple things that you probably have lying around.

I'll walk you through how I anodized my new titanium cyclocross bike.

Step 1: Materials

0. Titanium

1. Rubber gloves (to avoid/prevent electrocution)

2. Plastic bowl/bucket/container

3. Small piece of sponge (1 x 1 x 1 cm), or a small piece of cloth (e.g. small strip of towel)

4. Voltage source that can be adjusted from 20-120 V. I used a commercial lab bench supply, but most people don't have these lying around the home. A good solution is to buy twelve 9 V batteries and connect them together in series. This allows you to adjust your voltage in discrete 9 V increments, or you can add a couple smaller voltage batteries in series as well.

5. Alligator clips to connect to your workpiece

6. Comet cleaner (I used this because it is cheap, i.e. less than a dollar), baking soda, TSP (trisodium phosphate), ammonium-phosphate, or Borax. Basically, anything similar to these products. Coca Cola or Pepsi will also work.

We'll be using some simple chemistry and electricity to perform magic!

<p>Great tutorial, I will be trying this on some of my broken frames. As I have several tig welders do you think there will be anyway to use one as the power suppy?</p>
Thanks! I don't think TIG has the correct kind of power supply for this. You want to be able to set a constant voltage, not current.
<p>Hey goldscott, I have a question about the power supply. I looked up that model in the picture and it only shows 0-30V. I dont know that much about electricity, but how did you get that to 110V? I want to buy this for some custom knife work.</p>
The PS that I posted was just an example. A proper lab supply that goes to 100+ V is pretty expensive. That's why I suggested batteries.
<p>How can i make titanium green? I've tried many times, it didn't work</p><p>Thank you </p>
You have to use the right voltage - around 110-120V. Start with a lower voltage and you should see it turn pink, then purple, then green as you ramp up the voltage. See the chart in step 3.
<p>It did turn green, but some parts of titanium got burnt. Do you have any explanation for this?</p><p>Thank you</p>
<p>What do you mean by burnt? Can you post a picture?</p>
<p>It's like this, is it because of titanium grade? or what? Importantly, I used ammonium sulfate into the water to make color</p>
<p>Ammonium sulfate is a good electrolyte. Perhaps the titanium needs to be cleaned of any surface oils before you attempt to anodize it.</p><p>How exactly are you applying electricity to each piece? I see a wire wrapped around one of the rings. Is that the positive electrode? What are you using for a negative electrode?</p>
<p>So fat i can anodize green, but i cant make the rainbow color. Do you have any suggestions for it?</p><p>Thank you in advance</p>
<p>You want to create a rainbow? Each color is a different voltage - see the chart in step 3.</p>
<p>The colors obtained by this method are &quot;interference&quot; colors that arise because the top surface of the somewhat transparent titanium oxide has a reflectivity (for light) that is comparable to the reflectivity of the titanium metal that is under the oxide. The colors have some similarity to the &quot;temper colors&quot; that you can be seen on plain carbon steel when it is heated. To get this effect requires two things :</p><p>1. the oxide thickness is roughly the same length as the wave length of visible light</p><p>2. oxide and metal have similar reflectivity for visible light.</p><p>It won't work for aluminum because aluminum oxide isn't reflective enough.</p><p>The wavelength of light varies with it's color.</p><p>For more, google &quot;carbon steel temper colours&quot; </p><p>pdubya, BSc, MSc, PhD (all in metallurgy)</p>
<p>Thanks for the explanation, Paul!</p>
Sweet, I'm going to make my titanium spork blue!!
<p>Did it work? Anything you'd recommend?</p><p>I spoke to some metalsmiths at my local makerspace and they told me I could get the bluing effect on titanium with a propane torch, so I think I'm going to go with that method.</p>
<p>EDIT: that is to say, I'm going to do this on my own titanium spork.</p>
<p>I recommend looking around Amazon or Lab surplus stores for old electrophoresis machines. They are lab grade adjustable power supplies, that are available for cheap. Check out Hoefer brand. <a href="http://www.biosurplus.com/store/categories/sub/20-used-electrophoresis-power-supply/" rel="nofollow">http://www.biosurplus.com/store/categories/sub/20-..</a></p>
<p>where can i buy the power supply? i see a lot of power supplies but most only goes upto 15v and the highest i've found only goes upto 90v. help please. thank you</p>
<p>Finding a nice adjustable DC power supply for these high voltages will be expensive. Check out Agilent, Tektronix, etc. </p><p>I'd suggest finding a local hackerspace, college lab, etc. </p>
2 questions. <br> <br>what voltage would I need to get a redish red? <br> <br>also what type of balisong is that in the picture?
Look at the chart in step 3. Maybe 90-110V. You'll have to experiment. <br> <br>I'm not sure about the knife. That is a picture I found online (to show the battery chaining).
You do realize 9v batteries are designed to clip into each other?
mastermakoko, you can use anything with phosphoric acid, which is most soda/cola. MiracleGro is primarily ammonium phosphate and works well too. There are several coffee maker descalers that make great electrolytes, TSP (trisodium phosphate), Cafiza, and a few others that have the phosphorus compound.
Shazni, you need DC voltage because you need an anode (anodising) and a cathode. You also need a way to protect yourself from high amperage. The circuit will draw several amps at the higher voltages. This can be very hazardous and will fuse the coil on your VariAC or dimmer. There are many commercial DC bench power supplies available that have current limiters built in to keep you safer. It's still a dangerous project even with a good DC supply. Rubber gloves, rubber shoes, no distractions. Put your cell phone on mute.
in my country we use 220v...so what do i do<br>do i use ac power with a dimmer switch only or do i need a transformer to get DC power...then what would the Amperage be required? will 1.5 amp or 1 amp be enough? also maximum voltage?<br>for my Styrofoam cutter i used a 12v 1 amp transformer with a dimmer switch ...so 12 v being the maximum.<br>please pretty please help as i have fallen in love with this new craft....i would like to try aluminum...as it's cheaper....but i see it's not possible as you have to use chemicals which would probably not exist here and also be very expensive....i now have to check hardware stores and ask if they sell titanium sheets :-) (hopefully they would know what I'm talking about!)<br>i'm looking forward to your reply.
You need DC power. 1 Amp is enough.<br><br>You need 30-90 VDC or so.<br><br>Titanium is expensive and difficult to find.
Hi. Could you tell me if the voltage is the same to anodize aluminium?<br><br>I am going to make 200 leaf of aluminion for a proyect but i dont know how to obtein the same color for all of them.. the idea are 200 yellow, 100 read, 100 bue etc.. <br><br>What to you sugest for that? thanks.. <br><br>Steven from Colombia
You cannot anodize aluminum with this method.
Thanks.. :(
so basically i can just use coca cola or pepsi as the anodizing compund?
dont you have pics of that ?. btw funny i have a brush like that in the picture. about the alu anodizing, i believe using an acid instead of water would work? have you tried using dyes in the electrolyte solution rather than using those voltages ? it seems a high voltage to use ?
I'm sorry I didn't take pictures of it. I know that aluminum anodizing requires dyes, but titanium anodizing does not. You need these high voltages to anodize titanium. I'm not too knowledgeable about the aluminum anodizing process, but it's dye based instead of voltage dependent.
could you expand step 4 ? what is the point with the paint brush ?
Basically you have a small piece of sponge (soaked in the electrolytic water solution) in the alligator clip (negative electrode), and you use it as a sort of "brush" to "paint" the solution onto the titanium. The titanium will change color when there is electricity passing through the solution.
Can we transfer this procedure to Aluminum instead of titanium? Great Instructable by the way
I doubt this method will work on Aluminum, otherwise more people would be doing it. Here's a good page to get you started on your own: <a rel="nofollow" href="http://www.focuser.com/atm/anodize/anodize.html">http://www.focuser.com/atm/anodize/anodize.html</a><br/>
Huh. Last time I attended an anodizing tutorial they were complaining about how hard it was to prep titanium; all sorts of nasty cleansers were involved - but it sounds like you got away with very little cleaning? Neat!<br/><br/>BTW, I think I like your &quot;mottled&quot; pink BETTER than a solid, even color on that size of piece.<br/><br/>Niobium (aka &quot;columbium&quot;) can also be anodized like this. Anodized Aluminum colors are produced with dyes rather than optically-active oxide layers, so even if you CAN anodize aluminum with a similar setup, you won't get colors.<br/><br/>A very good reference/supplier is <a rel="nofollow" href="http://www.reactivemetals.com/">Reactive Metal Studios</a>, although they specialize in jewelry-sized things. Download their catalog; it's good reading!<br/><br/>
<a rel="nofollow" href="http://www.theodoregray.com/PeriodicTable/PopularScience/2005/08/1/index.html">According to Theodore Gray,</a> Diet Pepsi, or any other cola, also works. You just need something with phosphoric acid.<br/>
Oh yes, forgot about cola. I'll update the instructible. Thanks!
Will this technique work with any metal other than Ti? It would be cool to be able to do the same to Aluminum.
It won't work with aluminum, but it may work with other elements in the same column on the periodic table as Ti. But I really don't know; I know very little chemistry. Doesn't hurt to experiment, though.

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