Deicer compositions including corrosion inhibitors

Abstract

The present invention is directed to improved deicer compositions including corrosion inhibitors for deicing applications, in particular deicer compositions that will be exposed to, or come in contact with, galvanized metal. In an embodiment, the invention includes a deicing composition including an aqueous solution containing an alkali metal carboxylate salt. The deicing composition further includes at least one corrosion inhibitor.

1 . (canceled)  
     
     
         2 . A deicing composition comprising: 
 a carboxylate salt selected from the group consisting of formate propionate, acetate and lactate;    at least one corrosion inhibitor selected from the group consisting of: a polyvalent metal ion compound; a compound having an —SH group with a pK a  in the range of 0.2 to 13; a sulfide ion compound; and combinations thereof; and    50 ppm to 10,000 ppm tolyltriazole.    
     
     
         3 . (canceled)  
     
     
         4 . A deicing composition comprising: 
 a carboxylate salt selected from the group consisting of formate propionate, acetate and lactate; and    at least one corrosion inhibitor selected from the group consisting of: a polyvalent metal ion compound selected from the group consisting of a lanthanide ion compound, and a combination of a lanthanide ion compound and a magnesium ion compound; a compound having an —SH group with a pK a  in the range of 0.2 to 13; a sulfide ion compound; and combinations thereof.    
     
     
         5 . (canceled)  
     
     
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         12 . (canceled)  
     
     
         13 . A deicing composition comprising: 
 a carboxylate salt selected from the group consisting of formate, propionate, acetate and lactate; and    at least one corrosion inhibitor selected from the group consisting of: a polyvalent metal ion compound selected from the group consisting of magnesium ion compound, and a combination of the magnesium ion compound and a lanthanide ion compound: a compound having an —SH group with a pK a  in the range of 0.2 to 13; a sulfide ion compound; and combinations thereof,    wherein the magnesium ion compound is selected from the group consisting of magnesium nitrate hexahydrate, magnesium acetate tetrahydrate, and combinations thereof.    
     
     
         14 . The composition of  claim 13 , comprising from 0.5% to 10.0% of a magnesium ion compound.  
     
     
         15 . The composition of  claim 13 , wherein the magnesium ion compound is present in sufficient quantity to provide from 0.05% to 3.0% soluble Mg(II).  
     
     
         16 . (canceled)  
     
     
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         19 . The composition of  claim 13 , wherein the compound having an —SH group with a pK a  in the range of 0.2 to 13 is selected from the group consisting of potassium O-ethylxanthate, 2-mercaptothiazoline, 2-mercaptopyridine, 2-mercaptopyrimidine, 5-mercapto-1-tetrazoleacetic acid, and 2-mercaptobenzimidazole.  
     
     
         20 . The composition of  claim 13 , wherein the compound having an —SH group with a pK a  in the range of 0.2 to 13 is selected from the group consisting of potassium O-ethylxanthate, 2-mercaptothiazoline, and 2-mercaptopyridine.  
     
     
         21 . (canceled)  
     
     
         22 . (canceled)  
     
     
         23 . A deicing composition comprising: 
 a carboxylate salt selected from the group consisting of formate, propionate, acetate and lactate; and    at least one corrosion inhibitor selected from the group consisting of: a polyvalent metal ion compound selected from the group consisting of magnesium ion compound, a lanthanide ion compound, and a combination thereof; a compound having an —SH group with a pK a  in the range of 0.2 to 13; a sulfide ion compound originating as a composition consisting of sodium sulfide nonahydrate, sodium sulfide anhydrous salt, or an aqueous solution of a sulfide salt, and combinations thereof; and combinations thereof.    
     
     
         24 . The composition of  claim 23 , comprising from 10 ppm to 5,000 ppm of the sulfide ion compound.  
     
     
         25 . The composition of  claim 4 , wherein the carboxylate salt comprises potassium acetate.  
     
     
         26 . The composition of  claim 4 , wherein the carboxylate salt comprises potassium formate.  
     
     
         27 . (canceled)  
     
     
         28 . The composition of  claim 4 , further comprising 50 ppm to 5 percent by weight alkali metal salt of metasilicate or silicate.  
     
     
         29 . (canceled)  
     
     
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         32 . (canceled)  
     
     
         33 . A deicing composition comprising: 
 an aqueous solution having a pH of between about 8 and about 12, comprising between about 40% and about 75% by weight of an alkali metal carboxylate salt selected from the group consisting of formate, propionate, acetate and lactate; and    at least one corrosion inhibitor selected from the group consisting of: a polyvalent metal ion compound selected from the group consisting of magnesium ion compound, a lanthanide ion compound, and a combination thereof; a compound having an —SH group with a pK a  in the range of 0.2 to 13; a sulfide ion compound, and combinations thereof.    
     
     
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         42 . (canceled)  
     
     
         43 . The composition of  claim 16 , wherein the polyvalent metal ion compound comprises a lanthanide ion compound.  
     
     
         44 . The composition of  claim 33 , wherein the corrosion inhibitor comprises a compound selected from the group consisting of 2-mercaptothiazoline; 2-mercaptopyridine; 2-mercaptopyrimidine; 5-mercapto-1-tetrazoleacetic acid; 2-mercaptobenzimidazole; thiolactic acid; 6-mercaptopurine; 1H-1,2,4-triazole-3-thiol; 2-mercaptobenzothiazole; mercaptobenzimidazole; monomecaptotriazine; dimercaptotriazine; trimercaptotriazine; the trisodium salt of trimercaptotriazine; O-ethylxanthic acid; dimethyldithiocarbamic acid; diethyldithiocarbamic acid; trithiocarbonic acid; and hydropolysulfide, carbonylthioylbis-, disodium salt (Thio-Red).  
     
     
         45 . The composition of  claim 33 , wherein the corrosion inhibitor comprise a compound selected from salts of the group consisting of 2-mercaptothiazoline; 2-mercaptopyridine; 2-mercaptopyrimidine; 5-mercapto-1-tetrazoleacetic acid; 2-mercaptobenzimidazole; thiolactic acid; 6-mercaptopurine; 1H-1,2,4-triazole-3-thiol; 2-mercaptobenzothiazole; mercaptobenzimidazole; trimercaptotriazine; the trisodium salt of trimercaptotriazine; O-ethylxanthic acid; dimethyldithiocarbamic acid; diethyldithiocarbamic acid; trithiocarbonic acid; and hydropolysulfide, carbonylthioylbis-, disodium salt (Thio-Red).  
     
     
         46 . A deicing composition comprising: 
 a carboxylate salt selected from the group consisting of formate, propionate, acetate and lactate; and    a single corrosion inhibitor consisting essentially of a compound having an —SH group with a pK a  in the range of 0.2 to 13.    
     
     
         47 . A deicing composition comprising: 
 a carboxylate salt selected from the group consisting of formate, propionate, acetate and lactate; and    only one corrosion inhibitor consisting essentially of a sulfide ion compound.