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Old 02-06-13, 03:55
Lynn Eades Lynn Eades is offline
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Tony, this was probably covered in Bob's thread, When a process like this is undertaken, a neutralizing process is required. When I bought phosphoric (muriatic) acid, (to clean my engine block out) the chemical company put " inhibitors" in the acid so that only the rust was attacked, and not the cast iron. Is it the same here? Is there a "neutralizing" process required here?
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  #2  
Old 02-06-13, 04:27
Grant Bowker Grant Bowker is offline
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Quote:
Originally Posted by Lynn Eades View Post
......When I bought phosphoric (muriatic) acid.....
I know this is a bit of a sidetrack but are you sure that phosphoric acid is related to muriatic acid? I have believed that muriatic acid is related to hydrochloric acid (a diluted form of hydrochloric acid?).
The difference might affect the chemistry (but not the concept) of neutralization.
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Old 02-06-13, 06:15
Lynn Eades Lynn Eades is offline
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You are right Grant. It is some time back that I found a very good article in an IMPCO (gas) manual, about cleaning out cast iron engine blocks (and how important it is to do so). Now that you mention it, it is Hydrachloric.
The Muriatic acid is a certain strength of it.
That cleared the confusion in my head. I now recall the Phosphoric (in Coke, and lots of other food) is for cleaning mild steel. If you put high tensile steel, cast iron or any non ferrous metals in it, it then makes everything else you put in it, dirty. Thanks Grant.

I have met old guys, that are way off the truth. I don't think they mean to be. It just happens as our brain cells die,..... Its a shame the ones that die, don't all come from the 90% we don't use.
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  #4  
Old 03-06-13, 09:45
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Bob Moseley (RIP) Bob Moseley (RIP) is offline
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Default Phosphoric Acid

Hi guys - when I finish electrolysis derusting I paint the metal with a dilute solution of this stuff. When dry it leave a white powder that I brush off, (mask required). This neutralises everything but etch priming must be done immediately as the red curse quickly starts.

Bob
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Old 03-06-13, 09:57
Lynn Eades Lynn Eades is offline
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Probably a good time to put it through the blasting cabinet after that (before the paint) Bob.
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So many questions....
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Old 03-06-13, 12:01
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Default Hmmm..

Quote:
Originally Posted by Lynn Eades View Post
It just happens as our brain cells die,..... Its a shame the ones that die, don't all come from the 90% we don't use.
Is this a Kiwi thing??
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Old 03-06-13, 12:45
Lynn Eades Lynn Eades is offline
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Tony , (it seems, based on MLU stats, about 25% of Australians, are Tonys)
I'd be truly surprised, if you're were exempt!!!
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Carrier Armoured O.P. No1 Mk3 W. T84991
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So many questions....
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  #8  
Old 03-06-13, 13:18
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Well Lynn, I can't speak for my other "Tony" bretheren, but earlier tonight I sat down and typed a long posting to send, on the topic of cleaning parts & soda blasting. After about 20min of typing & going back to make typo correction, I hit the wrong button and promptly erased the entire thing by refreshing the page! Demoralised sufficiently to not attempt to redo the bloody thing.

I'm obviously not immune!
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Old 03-06-13, 13:45
Lynn Eades Lynn Eades is offline
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Tony, My full commiserations, all the more if you "hunt and peck" like me.
Good to know it's not just a Kiwi thing. (this is the cruel and manipulative bit) We should get back on track. What did we miss?
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Carrier Armoured O.P. No1 Mk3 W. T84991
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6.
Dodge WC55. 37mm Gun Motor Carriage M6
Jeep Mb #135668
So many questions....
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