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.

Description

CROSS REFERENCE TO RELATED APPLICATION [0001] This application claims the benefit of Provisional Application No. 60 / 673,858 filed Apr. 22, 2005, the disclosure of which is incorporated by reference.FIELD OF THE INVENTION [0002] The invention relates to lubricating compositions and other functional fluids. The compositions comprise at least one triazole-containing species and at least one thiadiazole-containing species. In preferred lubricating compositions, at least one extreme pressure (EP) component and at least one phosphorus-containing antiwear component are also present. In preferred embodiments the compositions are particularly useful in manual transmission oils. BACKGROUND OF THE INVENTION [0003] Emerging industry requirements for manual transmission fluids in the areas of micropitting and corrosion protection have created a need for new lubricant compositions. In order to meet these requirements, new additive systems suitable for blending with appropriate base stocks are nee...

AI Technical Summary

Benefits of technology

The invention is a lubricant composition that includes a combination of triazole-containing species and thiadiazole-containing species. The composition also includes ingredients such as extreme pressure components and phosphorus-containing antiwear components. The composition has been found to provide improved corrosion protection for manual transmissions and is effective in preventing copper corrosion. The invention also provides formulated lubricants that meet specific requirements for high temperature performance. The technical effects of the invention include improved protection against corrosion, wear, and micropitting.

Problems solved by technology

However, corrosion may be seen in the field with the use of S, P-based lubricants, particularly when copper-containing components, e.g. coolers, are employed.

Consequently, OEMs are issuing specifications which make it difficult for formulators to use S, P-containing additives.

Therefore, many have stopped using S, P-containing additive systems because of corrosion issues.

New demands with respect to micropitting, corrosion protection and durability are placing severe demands even on MTOs not using S, P chemistry.

Conventional S, P packages struggle to meet a satisfactory level of performance.

Given the enormous number of ingredients proposed for additive packages, it is a formidable task to find the right combination capable of meeting the number of new requirements desired in driveline fluids such as MTOs while maintaining traditional performance standards in other areas.