Grease composition

Abstract

The present invention provides a grease composition containing at least one lubricating base oil selected from a mineral oil and a synthetic oil, and 1 to 40% by mass of a thickener and 0.5 to 15% by mass of an alkenyl succinimide based on the total amount of the grease composition, the grease composition being used for a lubricating part in which at least one of members is made of a non-ferrous metal. According to the grease composition of the present invention, galling (seizure) and wear can be sufficiently suppressed and sliding properties can be achieved at a high level even in the case where sliding is performed under extreme pressure conditions where a sliding part having a non-ferrous metal is subjected to a high load.

1 . A grease composition containing:
 at least one lubricating base oil selected from a mineral oil and a synthetic oil, and   1 to 40% by mass of a thickener and 0.5 to 15% by mass of an alkenyl succinimide based on the total amount of the grease composition,   the grease composition being used for a lubricating part in which at least one of members is made of a non-ferrous metal.   
     
     
         2 . The grease composition according to  claim 1 , wherein the alkenyl succinimide is at least one selected from an alkenyl succinimide not containing boron and a boron-containing alkenyl succinimide whose boron content is more than 0% by mass and 1.0% by mass or less based on the total amount of the boron-containing alkenyl succinimide. 
     
     
         3 . The grease composition according to  claim 1 , wherein the succinimide compound has a polybutenyl group whose weight average molecular weight is 2000 or less. 
     
     
         4 . The grease composition according to  claim 1 , wherein the non-ferrous metal is at least one selected from aluminum, magnesium, copper, titanium, nickel, chromium, zinc, tin, lead and titanium, and alloys thereof. 
     
     
         5 . The grease composition according to  claim 1 , wherein a Vickers hardness of the non-ferrous metal is 150 or less. 
     
     
         6 . A lubricating method of bringing the grease composition according to  claim 1  into contact with a lubricating part in which at least one of members is made of a non-ferrous metal.