Monocarboxylic acid based antifreeze composition for diesel engines

The present invention relates to an acid based antifreeze coolant formulatio n for heavy duty applications such as for diesel engines which may be used for inhibition and prevention erosion and corrosion of aluminum and the corrosio n of other metals exposed to an aqueous liquid in automotive coolan...

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Bibliographic Details
Main Authors ALDEN W. OLSEN, DAVID E. TURCOTTE, MICHAEL A. DITURO, CARL R. STEPHENS, ARNOLD L. COFFEY JR
Format Patent
LanguageEnglish
Published 29.04.2004
Edition7
Subjects
ADHESIVES
CHEMICAL SURFACE TREATMENT
CHEMISTRY
COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
COATING MATERIAL WITH METALLIC MATERIAL
COATING METALLIC MATERIAL
DIFFUSION TREATMENT OF METALLIC MATERIAL
DYES
INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL
MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLICMATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASSC23 AND AT LEAST ONEPROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
NATURAL RESINS
NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE
PAINTS
POLISHES
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Summary:The present invention relates to an acid based antifreeze coolant formulatio n for heavy duty applications such as for diesel engines which may be used for inhibition and prevention erosion and corrosion of aluminum and the corrosio n of other metals exposed to an aqueous liquid in automotive coolant systems. The formulation further inhibits mineral scale. It may be packaged as an ethylene glycol based additive for use in new engines or in a concentrated inhibition package as an additive as for reinhibition of used coolant. The combination of a mixture of ethylene or propylene glycol, a monobasic aliphatic organic acid, azoles, low levels of molybdates, a combination of nitrite and/or nitrate salts, polyvinylpyrrolidone, a hydroxide salt, silicates and/or siloxane stabilized silicates with transition metal compoun ds provide a synergistic protective effect against the cavitation corrosion of aluminum in aqueous liquids reducing the corrosion rate and is effective at relatively low concentrations and varying pH ranges.
Bibliography:Application Number: AU20000035029