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AssigneeAshland Licensingaand Intellectual Property, LLC
InventorsDavid E. Turcotte, Michael Dituro, Alden W. Olsen, Arnold L. Coffey, Jr., Carl R. Stephens
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The present invention relates to a carboxylic acid based antifreeze coolant formulation for heavy duty applications such as for diesel engines which may be used for inhibition and prevention erosion and corrosion of aluminum and the corrosion 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 carboxylic organic acid, azoles, low levels of molybdates, a nitrite salt and/or nitrate salt and/or siloxane stabilized silicate, and combinations thereof, polyvinylpyrrolidone, 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.
An acid based antifreeze composition for inhibiting the corrosion of metals and inhibiting mineral scale based on 100 parts by weight of said glycol-based solution consisting of a monobasic carboxylic acid of up to 10.0 weight percent, a nitrite salt which is at least one selected from the group consisting of sodium nitrite, potassium nitrite, magnesium nitrite, calcium nitrite, lithium nitrite and combinations thereof in an amount of from 0.001 to about 10.0 percent by weight, a nitrate salt selected from the group consisting of sodium nitrate, potassium nitrate, magnesium nitrate, calcium nitrate, lithium nitrate, and combinations thereof in an amount of from 0.001 to about 10.0 percent by weight, an azole compound selected from the group consisting of sodium mercaptobenzothiazole, sodium tolytriazole, water-soluble triazoles, benzotriazole, tolyltriazole, sodium 2-mercaptobenzothiazole and combinations thereof in an amount of about 0.01 to about 10.0 percent by weight, a silicone-silicate copolymer in an amount of about 0.01 to about 10.0 percent by weight, from about 0.001 to about 5.0 percent by weight of a polyvinylpyrrolidone, from about 0.001 to about 10.0 weight percent of a transition metal compound selected from the group consisting of disodium salt dihydrate of molybdic acid, molybdenum trioxide, silicoheteropolymolybdates and/or phosphoroheteropolymolybdates, sodium molybdate, potassium molybdate, lithium molybdate, ammonium molybdate, ammonium dimolybdate, and ammonium heptamolybdate, and a glycol compound selected from the group consisting of ethylene glycol, diethylene glycol, propylene glycol, methyl alcohol, ethyl alcohol, propyl alcohol, isopropyl alcohol and combinations thereof making up the balance of the solution further consisting of:
An antifreeze/coolant reinhibition concentrate for inhibiting the corrosion of metals and inhibiting mineral scale based on 100 parts by weight of a glycol-based solution for addition at a rate of 1 part to 50 parts to spent diluted coolant consisting of a major amount of spent diluted coolant and a reinhibition concentrate consisting of:
An antifreeze/coolant reinhibition concentrate for inhibiting the corrosion of metals and inhibiting mineral scale based on 100 parts by weight of a glycol-based solution, for addition at a rate of 1 part to 50 parts to spent diluted coolant consisting of a major amount of spent diluted coolant and a reinhibition concentrate consisting of:
An antifreeze/coolant reinhibition concentrate for inhibiting the corrosion of metals and inhibiting mineral scale based on 100 parts by weight of a glycol-based solution, for addition at a rate of 1 part to 50 parts to spent diluted coolant consisting of a major amount of spent diluted coolant and a reinhibition concentrate consisting of:
An antifreeze/coolant reinhibition concentrate for inhibiting the corrosion of metals and inhibiting mineral scale based on 100 parts by weight of a glycol-based solution, for addition at a rate of 1 part to 50 parts to spent diluted coolant consisting of a major amount of spent diluted coolant and a reinhibition concentrate consisting of:
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