I have an anodizing station and am ready to help fellow overclockers. $35 per batch in black, $40 per batch for other solid colors. You provide the aluminum parts already sanded/polished. 6061 works the best. A batch is approximately the size of 10 CPU waterblocks. PM me for details/questions.
The anodizing is Type II, class 2, almost any color is available. A "Hard" anodize can only be black or clear.
A type 2 anodize is hard enough that it cannot be scratched with steel wool. It was very difficult for me to scribe a line in one piece after it had been anodized.
I have not been able to find pure aluminum anywhere. 6061 is the most readily available alloy, and is inexpensive. I put that disclaimer there as a warning, since some aluminum alloys will anodize just fine, but they will not take color.
I also have another question, can steel be anodized, or only aluminum? The reason I ask is because I have two steel fan grills that I'd also like anodized green, but am not sure if this is possible.
What can be powder coated? Typically Steel, Aluminum*, or Iron. Our gun allows us to coat on almost any surface, although it must be able to withstand ~400 degrees for 40+ minutes for curing. Our oven size is - 6'W x 8'T x 14.5' long.
*For powder coating aluminum the normal cure temperature can change the molecular makeup, aluminum parts that have critical strength properties are powder coated with a low cure powder and cured @ 320 degrees