Re: Re: Re: NOT CHANGING ANTIFREEZE REGULARLY

Posted by Tom on October 24, 2000 at 09:36:38 from (216.136.4.135):

In Reply to: Re: Re: NOT CHANGING ANTIFREEZE REGULARLY posted by Ken McWilliams on October 23, 2000 at 13:34:30:

You are correct the breakdown product would be a carboxylic acid such as glycolic acid HOCH2COOH. The metal ions, heat, oxygen, and light(UV radiation) play a role in this process. The reserve alkalinity will then neutralize this acid. The RA is composed of inorganic compounds such as sodium carbonate, sodium silicate, sodium phosphate compounds, and sometimes small amounts of sodium hydroxide. Buffers also contribute to this ability to neutralize this acid. Those commonly used are sodium tetraborate, and sodium phosphate compounds. An amine compound would not be appropriate for this applicayion because of its filming properties on metal surfaces and its lack of corrossion inhibition properties in the pressence of large amounts of oxygen. As stated before closed systems are not really isolated from oxygen outside the system.

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