Environmental Crack Arrestment Composition.
DEPARTMENT OF THE NAVY WASHINGTON DC
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A corrosion protective composition, particularly useful for crack arrestment, is disclosed wherein a mixture of finely divided solid inorganic inhibitor compounds are solubilized in a 0.1M stock solution of an alkyl or alkyl-aryl group, organo-substituted quaternary ammonium salt and an organic solvent, the approximate ratio of the compound to the solution being 1.00 g10 ml. The inorganic compounds, including sodium dichromate, sodium borate, sodium nitrite and sodium molybdate, are mixed in specific combinations and dissolved in the organic solvent by phase transfer catalysis involving an anion exchange reaction between the salt and the inorganic compounds. Quaternary ammonium salts used as the phase transfer catalyst include methyl trialkyl C8 - C10 ammonium chloride and tricapryl methyl ammonium chloride, while effective organic solvents include xylene and mineral spirits.
- Inorganic Chemistry
- Coatings, Colorants and Finishes
- Properties of Metals and Alloys