Roadwarrior1969 wrote:
I had problems in my aluminium castings, was referred to 'nitrogen
pellets' - you stir them in with a steel 'swizzle stick' thingie. I
was told that the bubbles are hydrogen.

Frank wrote:

Thank-you to all for the ideas posted and messages on improving the
quality of Alum Castings. (last week or the week before...)

The area I focused on was trying a Chlorine Degassing process as
outlined by Tim W.


That is what they are - Nitrogen pellets ?

I have used pool tablets - the thumb size for small pools the chlorine
steals the hydrogen makes HCL (gas) and the calcium turns out as scum.
Something like that.

Martin

--
Martin Eastburn, Barbara Eastburn
@ home at Lion's Lair with our computer
NRA LOH, NRA Life
NRA Second Amendment Task Force Charter Founder