[Gasification] vehicle conversion at weekend gasification workshop in bay area, california

[Kevin Chisholm]

Dear Jeff

Any HCl will work... dilute acid is slower, takes longer, and you need 
more of it.

Note also that the zinc associated with Galvanized Iron is in two forms:
1: Free zinc on the surface of the metal. This comes off relatively 
easy, because of its reactivity. Zinc plated goods have only "free zinc."
2: Intermetallic zinc, a zinc compound, Fe3Zn (?) The zinc has formed a 
compound with the underlying iron. It is necessary to corrode away the 
iron associated with the Fe3Zn(?) in order to get out all the Zn.

So, if you "acid dip" a part with zinc on it, you can easily remove the 
zinc from zinc plated iron, but it is a lot more difficult to eliminate 
the zinc from galvanized iron.

Best wishes,

Kevin




Jeff Davis wrote:
> Thanks for all the info... I'm glad that I didn't e-mail Tom to have me
> removed from this list! I learn so much here...
> 
> Can hydrochloric acid be purchased at a welders supply house and does it
> need to be 100% pure or will something like 10% work?
> 
> 
> 
> Always learning,
> 
> Jeff
> 
> 
> 
>> Please neutralize the de-galvanized metal in a baking soda solution
>> followed
>> by a fresh water rinse prior to welding.
>>
>>
>> Jeff Davis wrote:
>>> Dear Jim,
>>>
>>> Please tell us more about how to use acid to remove the galvanizing.
>>>
>>>
>>> Jeff
>>>
>>>
>> Stick the galvanised thing into hydrochloric acid (also known as
>> Muriatic Acid). H2 will be evolved and eventually all the galvanising
>> will be gone. if you keep adding zinc to the remaining liquid till it
>> stops gassing you can use the remaining liquid as soldering flux. This
>> comes from the plumbing trade. HCL available at hardware shops. Ready
>> made soldering fluid used to (may still) be sold in Australia as
>> "Baker's Soldering Fluid" (Bakers???).
>>
>> Use the usual care around the acid.
>>
>> Kurt
>>
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>>
>>
> 
>