Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Cast Iron pitting with high heat

  1. Apr 22, 2006 #1
    I have noticed on cast iron surfaces that have been heated pretty well, they form craters on the surface. I have seen it on exhaust headers on cars where the timimg was wrong. I was wondering if this is a standard phenomenon and what action is occuring here to cause this?


  2. jcsd
  3. Apr 26, 2006 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    I think what's accelerating the corrosion to the exhaust header is the high temperatures. If you have a leak in the exhaust, you will end up trapping heat between the cylinder head and the exhaust header. This increased temperature raises diffusion rates and hence speeds up the rate of corrosion.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook