I thought muriatic acid was the ingredient in concrete etch. On Feb 21, 2012, at 4:08 AM, surfswab wrote:
> I tend to wary of anything labeled "acid." Although phosphoric acid, > which is found in pool cleaner, would seem much less toxic than > anything that would "etch" (eat) concrete. > > But that's just me. :) > > > On Feb 20, 2:31 pm, Kevin Green <[email protected]> > wrote: >> Hi Everybody, >> >> I Thought I would share a hard lesson I just learned. I had great success >> with Phosphoric Acid, sold at Advance Auto Parts for about $7/quart as >> Purple Power De-Ruster. I found out that concrete etch, sold for about >> $12/gallon is (usually) also Phosphoric Acid. It seems that the phosphoric >> acid does a great job of actually converting the rust (iron oxide) back to >> iron and actually reversing the rust. Unfortunately I bought a concrete >> etch that also had Nitric Acid (in addition to Phosphoric), which is not >> selective the same way, and while it converted the the rust on my header >> pipe back to iron, it also ate the iron, so I have a totally destroyed >> header pipe to replace. If anybody is interested I can share photos >> comparing how nice a job the phosphoric did when a part was left to soak >> overnight, and how brutally the part was destroyed when left in Nitric for >> about 9 hours. >> >> TL;DR; Phosphoric Acid Good, Nitric Acid Bad >> >> Kevin > > -- > You received this message because you are subscribed to the Google Groups > "Nighthawk Motorcycle Lovers!" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/nighthawk_lovers?hl=en. > -- You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/nighthawk_lovers?hl=en.
