Re: Anodizing Aluminum, where went wrong? [ Started by Hard Color in Anodizing : 12 replies ]
Why can I not repeat the process
I had great success aodizing a single piece of ali 1 inch sq at 175 ma for 1 hour, rinsed and rinsed again, soaked in dye for 30 minutes, boiled for 45...beautiful :)
BUT WHY CAN I NOT REPEAT THE PROCESS
tried the above process with the same bit of metal, this time only filed the anodizing away to reveal virgin material, increased the size of the lead..but nothing happens, metal only turns grey after boiling,
Tried same process with other bits of metal, used a different power supply, checked temperature, distance of anode and cathode, polarity..even "over " cleaned the work with ultrasonic, most bubbles at the lead....still no joy.
I notice there is a bit of crystalization at the acid waterline with the metal.I am using 2 litres of acid and fresh de ionised water every time to rince. Acid is same ..battery acid cut 50/50 wit DI water.
I store acid in a clear plastic container, outdoors, behind my shed from direct sunlight, I have also noticed that th …
