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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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A caution about the excellent Castrol purple cleaner
I bought this stuff because Grant and others said it worked well to
remove oils. And it sure does. I suspected that it might be pretty strongly alkaline because of the soapy feel. And I got proof when washing some anodized parts that came in for mods. The Castrol purple stuff started to remove the dye (black) and on the machined surfaces started to dull them slightly. I will still use the stuff on aluminum if I need to but will not let it sit for long. I wonder if it would make a good weld prep for aluminum? ERS |
#2
Posted to rec.crafts.metalworking
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A caution about the excellent Castrol purple cleaner
I used to clean and etch aluminum parts in a similar highly caustic
purple soap (Oakite?) as part of the Iridite process. jw |
#3
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A caution about the excellent Castrol purple cleaner
It does contain lye, Eric, in which aluminum is highly soluble ..
GWE Eric R Snow wrote: I bought this stuff because Grant and others said it worked well to remove oils. And it sure does. I suspected that it might be pretty strongly alkaline because of the soapy feel. And I got proof when washing some anodized parts that came in for mods. The Castrol purple stuff started to remove the dye (black) and on the machined surfaces started to dull them slightly. I will still use the stuff on aluminum if I need to but will not let it sit for long. I wonder if it would make a good weld prep for aluminum? ERS |
#4
Posted to rec.crafts.metalworking
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A caution about the excellent Castrol purple cleaner
Eric R Snow wrote:
I bought this stuff because Grant and others said it worked well to remove oils. And it sure does. I suspected that it might be pretty strongly alkaline because of the soapy feel. And I got proof when washing some anodized parts that came in for mods. The Castrol purple stuff started to remove the dye (black) and on the machined surfaces started to dull them slightly. I will still use the stuff on aluminum if I need to but will not let it sit for long. I wonder if it would make a good weld prep for aluminum? ERS I use the purple degreaser myself, in fact I have a 5 gal of it. It is one of the few chemicals in my (home) shop that I use gloves when using. It is very strongly alkaline (lye) and will do a number on your hands just like cement will. Pete C. |
#5
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A caution about the excellent Castrol purple cleaner
It is so good that the CA air quality folks have banned the sale in
SoCal. I am now buying mine in AZ. |
#6
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A caution about the excellent Castrol purple cleaner
On Fri, 18 Nov 2005 16:16:25 -0800, Grant Erwin
wrote: It does contain lye, Eric, in which aluminum is highly soluble .. Surely it's potassium hydroxide, not sodium hydroxide ? Nearly as much saponification on grease, but a lot lighter on metals. I'd still be cautious about using it around aluminium. One of the popular bike cleaners (Muc-Off) contains KOH and is known to damage Mavic rims. This says more about the problems with the anodising on Mavic rims than the cleaner though! I'm keeping the cleaner, losing the rims. |
#7
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A caution about the excellent Castrol purple cleaner
Andy Dingley wrote:
On Fri, 18 Nov 2005 16:16:25 -0800, Grant Erwin wrote: It does contain lye, Eric, in which aluminum is highly soluble .. Surely it's potassium hydroxide, not sodium hydroxide ? Nearly as much saponification on grease, but a lot lighter on metals. I'd still be cautious about using it around aluminium. One of the popular bike cleaners (Muc-Off) contains KOH and is known to damage Mavic rims. This says more about the problems with the anodising on Mavic rims than the cleaner though! I'm keeping the cleaner, losing the rims. Nope, the label on the 5gal of Zep brand purple degreaser I have says Sodium Hydroxide. Pete C. |
#8
Posted to rec.crafts.metalworking
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A caution about the excellent Castrol purple cleaner
On Fri, 18 Nov 2005 16:16:25 -0800, Grant Erwin
wrote: It does contain lye, Eric, in which aluminum is highly soluble .. GWE Eric R Snow wrote: I bought this stuff because Grant and others said it worked well to remove oils. And it sure does. I suspected that it might be pretty strongly alkaline because of the soapy feel. And I got proof when washing some anodized parts that came in for mods. The Castrol purple stuff started to remove the dye (black) and on the machined surfaces started to dull them slightly. I will still use the stuff on aluminum if I need to but will not let it sit for long. I wonder if it would make a good weld prep for aluminum? ERS Well, there ya go. ERS |
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