Corrosion inhibiting heat transfer materials
An anti-corrosion composition for use with a liquid or the liquid resulting from the addition of components is provided. The composition can include an acid, a phosphate ester of an alcohol, an inorganic phosphate, a salt of polyacrylates and a salt of an organophosphonate. The composition can be used with anti-freeze compositions or heat transfer fluids and advantageously exhibits enhanced corrosion resistance properties. A heat transfer medium is also provide, having water, glycol, an ester of a phosphoric acid, a phosphate salt and an acid, wherein the medium is a GRAS composition capable of satisfying ASTM 1384 and 4340.
1. An anti-corrosion formulation for combining with a fluid or the fluid resulting from the addition of components, comprising:
an acid;
a phosphate ester of an alcohol;
an inorganic phosphate;
a salt of polyacrylates; and
a salt of an organophosphonate;
the formulation being a GRAS composition capable of satisfying ASTM 1384, 6208 and 4340.
2. The formulation of claim 1 , wherein the acid is aliphatic and comprises one or more carboxylic acids.
3. The formulation of claim 1 , wherein the acid is aliphatic and comprises one or more branched acyclic aliphatic acids.
4. The formulation of claim 1 , wherein the acid is aliphatic and comprises one or more branched cyclic aliphatic acids.
5. The formulation of claim 1 , wherein the components comprise ethylhexanoic acid.
6. The formulation of claim 1 , wherein the components comprise one or more derivatives of ethylhexanoic acid.
7. The formulation of claim 1 , wherein the components comprise 2-ethylhexanoic acid.
8. The formulation of claim 1 , wherein the phosphate ester of the alcohol comprises mono-ethylhexylphosphate.
9. The formulation of claim 1 , wherein the inorganic phosphate comprises dipotassium phosphate.
10. The formulation of claim 1 , wherein the salt of polyacrylates comprises one or more sodium acrylate polymers.
11. The formulation of claim 1 , wherein the organophosphonate comprises ethylhexyldiphosphonic acid.
12. The formulation of claim 1 , wherein the salt of an organophosphonate comprises sodium ethylhexyldiphosphonate.
13. The formulation of claim 1 , wherein the formulation has a pH of about 8to 10.
14. The formulation of claim 11 , wherein the formulation has a pH of about 6.5 to 10.5.
15. The formulation of claim 11 , wherein the formulation has a pH of about 9.
16. The formulation of claim 1 , wherein the inorganic phosphate comprises about 0.5-5% of the formulation by weight.
17. The formulation of claim 16 , wherein the inorganic phosphate comprises about 1.5% of the formulation by weight.
18. The formulation of claim 1 , wherein the acid is aliphatic and comprises about 0.5-5% of the formulation by weight.
19. The formulation of claim 18 , wherein the acid comprises about 1% of the formulation by weight.
20. The formulation of claim 1 , wherein the phosphate ester of the alcohol comprises about 0.5-5% of the formulation by weight.
21. The formulation of claim 1 , wherein the phosphate ester of the alcohol comprises about 1% of the formulation by weight.
22. The formulation of claim 1 , wherein the salt of polyacrylate comprises about 0.01-1% of the formulation by weight.
23. The formulation of claim 22 , wherein the salt of polyacrylate comprises about 0.1% of the formulation by weight.
24. The formulation of claim 1 , further comprising a sodium ethylhexyldiphosphonate comprising about 0.01-1% of the formulation by weight.
25. The formulation of claim 24 , wherein the sodium ethylhexyldiphosphonate comprises about 0.1% of the formulation by weight.
26. The formulation of claim 1 , wherein the water comprises over about 95% of the formulation by weight.
27. The formulation of claim 1 , further comprising an alkylene glycol.
28. The formulation of claim 1 , further comprising a propylene glycol.
29. The formulation of claim 1 , further comprising a 1,2 propylene glycol.
30. The formulation of claim 1 , further comprising a 1,3 propylene glycol.
31. The formulation of claim 1 , further comprising a dipropylene glycol.
32. The formulation of claim 1 , further comprising one or more monoalkyl ethers of one of 1,2 propylene glycol, 1,3 propylene glycol and dipropylene glycol.
33. The formulation of claim 27 , wherein the alkylene glycol comprises about 0-90% of the formulation by weight.
34. The formulation of claim 1 , wherein the formulation is used in a heat exchanger comprising aluminum.
35. The formulation of claim 1 , wherein the formulation is used in a heat exchanger comprising aluminum alloy.
36. The formulation of claim 1 , wherein the formulation is used in a heat exchanger comprising cast iron.
37. The formulation of claim 1 , wherein the formulation does not comprise more than a trace amount of amines, nitrates, nitrites, chromates, molybdates, borates, triazoles and silicates.
38. A heat transfer medium comprising:
water;
an alkyleneglycol;
an aliphatic acid;
a partial phosphate ester;
dipotassium phosphate;
a sodium salt of polyacrylates; and
a sodium salt of ethylhexyldiphosphonic acid;
the medium being a GRAS composition capable of satisfying ASTM 1384 and 4340.
39. A heat transfer medium, comprising
water,
glycol,
an ester of a phosphoric acid, and
a phosphate salt and an acid;
the medium being a GRAS composition capable of satisfying ASTM 1384 and 4340.
40. The medium of claim 39 , wherein the medium comprises 30% 1,2 propyleneglycol by weight, the medium containing
1.7% dipotassium phosphate by weight,
sodium HEDP,
sodium polyacrylate and
2-ethylhexanoic acid with a pH adjusted to 9.0.
41. The medium of claim 39 , wherein the medium comprises 30 % 1,2 propylene glycol by weight, the medium containing
1.7% dipotassium phosphate by weight,
sodium HEDP,
sodium polyacrylate,
2-ethylhexanoic acid and
mono-2ethylhexylphosphate with a pH adjusted to 9.0.
42. The formulation of claim 1 , wherein the phosphate ester of an alcohol comprises mono-2-ethylhexylphosphate.