MrTitanium Presents:
How to build an anodizer for chump change

This article assumes that you want to build a regulated, controllable Direct Current voltage source specifically for anodizing reactive metals such as titanium, niobium (columbium), or tantalum to create the refracted, photonic interference colors.
With a tool like this, and the know-how presented in my how to anodize page, you can make stuff like what I make.

The difference between anodizing "reactive metals" (titanium, niobium, etc) and aluminum is that
  • Anodized titanium coloring is based on the voltage controlled thickness of a dielectric (electrical insulator) oxide layer. You need a controllable voltage source from about 20-130 VDC able to provide the desired current (100ma is sufficient for small areas. Even large, if you have patience and a current limiter).
    Visit my page explaining the natural law covering how titanium is colored without ink, dye, or paint.
  • Aluminum coloring is a current-based anodizing and dying process. It requires a low voltage source (typically 6-12vdc, like a battery charger).
    I haven't tried it myself, so try these links for authoritative aluminum info:
    Here's a good how-to page on how to anodize aluminum.
    Here's another good resource for anodizing aluminum.

To buy a ready made anodizer for reactive metals (Ti, Nb, Ta), try Reactive Metals, Inc for a studio anodizer unit for about $203.00

See a picture of some other units on my Anodizer Example Page.

Basic parts:

Function Traditional Component Details / est. price Discount component Details / Price
Safety Isolation Transformer 4 amp 12 lb $150 GFCI Outlet 15 amp $8
Voltage Control Variable Transformer 5 amp+ 10 lb
Dimmer switch 6 amp $4
Rectifier Diode Bridge rectifier 10 amp $3 -$6 Diode Bridge rectifier 10 amp $3 -$6
Smoother Electrolytic Capacitor 1000 mfd, 150v $20 Electrolytic Capacitor 1000 mfd, 150v $20
Fuse and holder Fast acting 10 amp $4 Fast acting 10 amp $4
Cap Drain Power resistor 200w 100 ohm $8 Light bulb & socket $3
Current limiter Power resistor 200w 100 ohm $8 Light bulb & socket $3
Voltmeter Panel Meter 150 vdc $25.00 Multimeter 150 vdc $5.00
Switches Toggle switches 15 amp, $2.50 each Light switches $0.40 each
Wire, electrical tape, wire nuts, pigtail, etc.   < $10   < $10
Approx. Total:   $300+   < $50

Warning: Any anodizer is a high-voltage source capable of electrocuting you. Whether or not you build it yourself, be sure you understand all the necessary safety procedures. These instructions are intended for (at minimum) competent tinkers and handymen. Ideally, an electronics hobbyist or electrician should be consulted or involved.
The parts list is intentionally vague: I've built most of my anodizers even cheaper than listed by shopping electronics salvage houses, and understanding the range of substitutions available.

Note: The following instructions assume the cheapest route of using the GFCI outlet and Dimmer switch. Wiring is slightly different using a variable transformer ("Variac"). But the (barely useable) dimmer can be replaced with a stable variac later, saving most of the other components.

FYI: The dimmer and light-bulb route is fine for playing around. If you want a truly functional, steady, stable and long-lived unit, spend a little bit extra for a variable transformer and power-resistors.

Step 1: You must be comfortable working with high voltages, and confident that you can build a safe device. If you aren't, pass these instructions to a friend who is.

Step 2: Shop for parts. Most of these parts are available at hardware stores (such as Home Depot, or Lowe's) and electronics shops (like Radio Shack). You can search online and visit those wonderfully cluttered electronics surplus/salvage shacks for better parts, cheaper.
An alert reader informed me that has a 10 amp variable transformer with current meter for only $70.00! (Jan 2003)

Step 3: Put the parts together in the order indicated in the illustration below. Use connectors, wire-nuts, solder, or whatever is appropriate for the components and case that you end up using.

Note: The lines in the drawing are not exactly representative of the locations on the components the wires will necessarily connect. Components (such as GFCI outlets and recifiers) may have different physical layouts. The text notes take priority over the crude illustration.
See the schematic below for a more precise and better design.

diagram for building your own titanium anodizer

This illustration shows basically how the essential parts fit together. Be aware of grounding and polarity wherever either applies. If you don't know what I'm talking about, don't build your own.

Click here to see and read about the whole construction process as I built this type of anodizer.

Mount all possible components in a box, chassis, or to a board for stability, and insulate all exposed contacts and connections in appropriate manners.

The component list above mentions a current limiter, which is not shown in the illustration. Just put another light bulb (7 watt or so) between the meter and the fuse to allow slow anodizing. A switch across that lamp would allow you to easily limit and un-limit the current.

Also not shown is an Ammeter, which is necessary to display the current in order to electroplate, or electro-etch.

Put the parts in a container for safety. You may be able to fit the GFCI, dimmer, and other small electronics into a standard residential wall box, let the light bulb hang out, and cover the capacitor contacts with electrical tape. You could buy or build a metal box enclosure. I built my first Jerry-rigged dimmer-based anodizer in a box of masonite perf-board. I do not recommend this practice unless your really understand where the heat comes from and will go. Use non-flammable materials for mounting components.

Peculiarities of this discount circuit:

Cautions (weasel words to protect me from liability for your potentially dangerous goofs):

Here is a useable schematic of an anodizer much like the one I use all the time. My own has even more switches and gizmos.
Anodizer Schematic
The resistors need to be rated for serious power, like 150 ohm, 200 watt. Light bulbs are cheaper.

Click Here for a dimmer and lighbulb based schematic drawing.

Examples: I'm posting pictures and descriptions of anodizers built with the help of the info I provide. See them here

Visit the MrTitanium Forum for more discussion on this subject
The MrTitanium Forum
If you found this information profitable, informative, or just plain useful,
please (via PayPal). I'd appreciate five bucks (or $15 or $50), but I leave it up to you.
After all, This information could be saving you hundreds.
I clipped this from a chain mail forum thread that sent traffic to this page. Fortuna had apparently followed my instructions, reported on the results, and then linked to my page.
" Topic: My capacitor came in the mail!
1800 mfd, 350V caps, about the size of a 16oz beer can. :O
Anyway, I finished making my cheap 40 dollar 120VDC variable power supply with it, and I grabbed some titanium 1/16th ID 24ga earrings I've been working on and stuck them in there. Very nice colours. This titanium anodizing stuff is really freaking cool."
Fortuna Wolf (Jan 29, 2003)

Once again: To buy a ready made anodizer, try Reactive Metals, Inc for a studio anodizer unit delivered for under $500. I haven't found a better deal.

Please, visit my pages for Unique titanium jewelry (samples of what my anodizer can do),
or About the Artist

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