From: pj@jostle.com   
      
   On Tue, 5 Dec 2017 03:59:00 -0800 (PST), dccinfo.ghy@gmail.com wrote:   
      
   >On Friday, 4 February 2005 19:23:34 UTC+5:30, Simon  wrote:   
   >> I need to clean out some partially blocked coolant passages inside an   
   >> aluminium radiator.  The radiator is out of a railway locomotive and   
   >> is not easily dismantled (it is all welded construction).   
   >>   
   >> I am told that sulphamic acid will remove the deposits - my concern is   
   >> that it will do a fairly good job at removing the aluminium too.   
   >>   
   >> Apart from the obvious answer (i.e. start at 5% solution and work up   
   >> gradually) does anyone have a suggestion as to what solution is the   
   >> best compromise between removing oxidisation and time taken?   
   >>   
   >> Thanks in advance.   
   >>   
   >> Simon   
      
   Not really.  Here we use 2% oxalic acid, but a large throughput   
   (turbulence) will have a better chance of cleaning.   
      
   To be sure test some of the corrosion etc by soaking in the cleaning   
   solution.   
      
   Hydrofluoric acid (as 2% soln) rapidly cleans aluminum but its action   
   must be watched and controlled.   
      
   Also, try YouTube.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)