[TheForge] RE: Permalac

[Steven Smith]

I'd like to better understand what the rust converters are doing. I used 
some once, maybe 10 years ago, on a car I was repairing (forlorn hope). 
Phosphoric acid will change red rust into black, but this is just one 
oxide form to the other. The converter changed red rust to a black, 
shiny stuff. There is more going on with the converter (at least what I 
used) than simple oxide conversion.

Anyone have a clue about this?

Steve



Woolley wrote:
> Grant,
>
> "One Step" is a brand name?
>
> Bill Woolley
>
>
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>
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>
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> Grant Marcoux wrote:
>> I think the reaction is Ferric oxide (red?) to Ferric nitrate (black?)
>> Anyway, the stuff works....paint on one coat, allow to work for 20 
>> minutes.
>> Add another coat and allow to work for 24 hrs.  A rich, deep black is
>> produced, with no ash.  You can Permalac over this surface nicely.   
>> Grant
>>
>> -----Original Message-----
>> From: theforge-bounces at mailman.qth.net
>> [mailto:theforge-bounces at mailman.qth.net]On Behalf Of Mike Spencer
>> Sent: Thursday, May 17, 2007 10:57 AM
>> To: theforge at mailman.qth.net
>> Subject: [TheForge] RE: Permalac
>>
>>
>>
>>  
>>> Permalac may be applied over "1-step" rust converter.
>>>     
>>
>> Okaayyyy, so what exactly do these "rust converter" products do?
>>
>> Given how many $$ and hours the metal and paint industries put into
>> coping  with rust, they sound like snake oil to me.  I have an aerosol
>> can of one brand that I've dicked around with a bit without learning
>> much. Yes, the red stuff turns black.   And?
>>
>> So what's the chemistry?  Fe+++ -> Fe++?  What happens at the surface
>> the base metal underneath?  To the water of hydration in the red rust?
>> What what?
>>
>>
>> - Mike
>>
>> -- 
>> Michael Spencer                  Nova Scotia, Canada       .~.
>>                                                            /V\
>> mspencer at tallships.ca                                     /( )\
>> http://home.tallships.ca/mspencer/                        ^^-^^
>>
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