Corrosion protection for lubricants

Abstract

The present invention relates to compositions comprising at least one triazole-containing species and at least one thiadiazole-containing species, which in embodiments are suitable for manual transmission oils.

1 . A lubricant composition suitable for use as a lubricating oil, said composition comprising at least one triazole-containing species and at least one thiadiazole-containing species.  
   
   
       2 . The composition of  claim 1 , comprising at least one triazole-containing species and at least one species from the group consisting of dimercaptothiadiazole and alkylated derivatives thereof.  
   
   
       3 . The composition of  claim 1 , where the triazole-containing species is tolyltriazole.  
   
   
       4 . The composition according to  claim 1 , further characterized by a ratio of thiadiazole-containing species to triazole-containing species of from about 20:1 to about 1:10.  
   
   
       5 . The composition according to  claim 4 , wherein the ratio of thiadiazole-containing species to triazole-containing species is from about 10:1 to about 1:1.  
   
   
       6 . The composition according to  claim 1 , further comprising at least one ingredient selected from (i) at least one sulfur-containing or boron-containing extreme pressure agent; and (ii) at least one phosphorus-containing antiwear agent.  
   
   
       7 . The composition according to  claim 1 , further characterized by having a ratio of sulfur to triazole-containing species of less than about 150:1.  
   
   
       8 . The composition of  claim 1 , further characterized by having a ratio of sulfur to triazole-containing species of less than about 100:1.  
   
   
       9 . The composition according to  claim 1 , further comprising ingredients selected from extreme pressure agents, antiwear agents, dispersants, detergents, rust inhibitors, corrosion inhibitors, anti-foaming agents, demulsifiers, pour point depressants, seal swell agents, emulsifiers, tackifiers, antioxidants, VI improvers, thickening agents, and mixtures thereof.  
   
   
       10 . A lubricant composition of  claim 1  comprising at least one basestock selected from API Groups I-V.  
   
   
       11 . An automotive transmission oil, industrial oil, industrial gear oil, hydraulic fluid, tractor oil comprising the lubricant composition of  claim 1 .  
   
   
       12 . A manual transmission oil comprising the lubricant composition of  claim 1 .  
   
   
       13 . The manual transmission oil of  claim 12 , wherein said basestock comprises at least one basestock selected from API Groups I-V.  
   
   
       14 . The manual transmission oil of  claim 12 , wherein said basestock composition is selected from API Group IV, API Group V, and mixtures thereof.  
   
   
       15 . The manual transmission oil of  claim 12 , wherein said basestock composition is selected from API Group IV.  
   
   
       16 . The manual transmission oil of  claim 12 , wherein said basestock composition comprises 2 cSt and 150 cSt PAO.  
   
   
       17 . The manual transmission oil of  claim 12 , wherein said basestock composition comprises 4 cSt PAO and 150 cSt PAO.  
   
   
       18 . The manual transmission fluid of  claim 12 , further comprising polyisobutylene and one of: 
 (a) a 2 cSt PAO and a 150 cSt PAO; or    (b) a 4 cSt PAO and a 150 cSt PAO.    
   
   
       19 . In a lubricating fluid comprising a corrosion inhibitor, the improvement comprising the presence of an effective amount of a combination of a triazole-containing species and a thiadiazole-containing species.  
   
   
       20 . A vehicle comprising a manual transmission, said manual transmission lubricated by a composition according to  claim 11 .  
   
   
       21 . A transmission lubricated by the compositions of  claim 1 .  
   
   
       22 . A transmission lubricated by the lubricating fluid of  claim 19 .  
   
   
       23 . A method of preparing a lubricating composition comprising combining the composition of any one of  claim 1  with at least one basestock selected from API Group I-V.  
   
   
       24 . A method of lubricating a transmission comprising adding a composition according to  claim 23  to a transmission.  
   
   
       25 . A composition comprising at least one thiadiazole-containing species and at least one triazole-containing species in the ratio of about 20:1 to about 1:10.  
   
   
       26 . The composition according to  claim 25 , wherein said ratio is about 10:1 to about 1:1.  
   
   
       27 . The composition according to  claim 1 , further comprising at least one ingredient selected from (i) at least one sulfur-containing or boron-containing extreme pressure agent; and (ii) at least one phosphorus-containing antiwear agent.  
   
   
       28 . A fully formulated lubricant composition based on S, P chemistry comprising at least one thiadiazole-containing species and at least one triazole-containing species in the ratio of about 20:1 to about 1:10.  
   
   
       29 . The fully formulated lubricant composition of  claim 28 , wherein said ratio is about 10:1 to about 1:1.