I have been trying to blacken copper for maximum solar absorptivity(sp?) for the past few months using ebanol c, but I've run into problems with white spots, uneven coating, and red areas around the edge of my parts. Help me! I've tried etching the surface and using a wide variety of cleaning methods to prep the surface, but to no avail. Is there another chemical or process that I can try?
Torch it until it turns black and try not to touch the sooty areas. If you put wax over it the black won't come off.
i'm no expert on photograph voltaic technologies; yet as I comprehend contemporary technologies there are in actuality 2 effortless the variety to flow--crystalline silicon and skinny action picture. Daystar is in the skinny action picture marketplace. presently skinny action picture is far less costly than crystalline silicon because of the fact call for has outstripped grant for crystalline silicon. As I comprehend it skinny action picture isn't as powerful as crystalline silicon and neither is extremely powerful approximately 10% and 13%. there's a superb form of room for progression. As for CIGS i don't comprehend very lots with reference to the technologies. I do have faith that there are numerous different agencies that are in the CIGS business enterprise. i think of international photograph voltaic, Nanosolar, Solopower, Heliovolt, and others besides. This industry is a start up industry. Do you remember the biogenetics while it started up? approximately ninety 5% of the agencies that went public are actually not from now on with us. in fact they are nonetheless loss of life off. I variety of assume the photograph voltaic industry to stay with that direction.
That Ebanol C worked well for me, very durable. But that was over stainless steel. Have you thought about just using a flat black spray paint, like the kind they use to paint engines? Or maybe you could try using brass instead of copper?
Use sodium hypochlorite also known as pool chlorine. Hope this helps, Kim
