Tech Q on desmut solution for aluminium
I put my anodized parts in a naoh ("Drano") solution to get rid of the
existing anodizing and it looks as though now I'll need to desmut then as they are a nice dark grey, not white at all. Will the stuff used for PCB etchant (ferric chloride) work? |
Tech Q on desmut solution for aluminium
_ wrote:
I put my anodized parts in a naoh ("Drano") solution to get rid of the existing anodizing ... I don't if lye (NaOH) removes anodizing, but if you want lye, don't use Drano! It is mostly lye, but has enough other stuff to make it unsuitable for anything but cleaning drains. Bob |
Tech Q on desmut solution for aluminium
According to _ :
I put my anodized parts in a naoh ("Drano") solution You mean NaOH (Sodium Hydroxide)? Without the proper mix of case, it is just puzzling (although the "Drano" did clear it up for me.) to get rid of the existing anodizing and it looks as though now I'll need to desmut then as they are a nice dark grey, not white at all. Will the stuff used for PCB etchant (ferric chloride) work? I don't know. Try wiping them with a cotton swab first. Or stirring the NaOH solution, if you have a magnetic stirrer. (You may need a fresh batch, if what you have is contaminated with the dye from the original anodizing.) Good Luck, DoN. -- Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
Tech Q on desmut solution for aluminium
_ wrote:
I put my anodized parts in a naoh ("Drano") solution to get rid of the existing anodizing and it looks as though now I'll need to desmut then as they are a nice dark grey, not white at all. Will the stuff used for PCB etchant (ferric chloride) work? AHHH! No, don't do that! I'm not sure whether it is pure ferric chloride, or ferric chloride which has been used to etch PC boards, and is loaded with copper chloride, but one or the other has a VIOLENT exothermic reaction with aluminum, and can turn into a foaming mess that spits sparks! I had an aluminum funnel start down that path on me about 30 years ago. Jon |
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