Two potential novel environmentally friendly ashless vegetable oil additives,2-mercaptobenzothiazole derivatives,di-n-dodecyl-[2-(2-benzothiazolyl)thio]ethylborane(LBN) and di-n-dodecylthio-[2-(2-benzothiazolyl) thio]ethylborane(LBNS),were synthesized and their tribological performance as additives in rapeseed oil(RSO) was evaluated using a four-ball wear tester.Their anti-corrosive properties and thermal stability were also examined. The worn surface of the steel ball was analyzed by means of scanning electron microscopy(SEM) and X-ray photoelectron spectroscopy(XPS).The results showed that 2-mercaptobenzothiazole derivatives exhibited excellent anti-corrosive property and high thermal stability.Moreover,they both had good load-carrying capacities and anti-wear and friction-reducing properties.The P_B values of samples decreased in the following order:LBNS>LBN>RSO.The results of XPS examination illustrated that the excellent tribological behavior of the prepared compounds used as additives in RSO was attributed to the formation of a protective lubrication film on the worn surface,which consisted of an adsorption layer and a reaction layer containing Fe_3O_4,FeS,Fe_2(SO_4)_3,FeB,and organic nitrogen-containing compounds. Two potential novel environmentally friendly ashless vegetable oil additives, 2-mercaptobenzothiazole derivatives, di-n-dodecyl- [2- (2- benzothiazolyl) thio] ethylborane (LBN) and di-n-dodecylthio- [2- thio] ethylborane (LBNS), were synthesized and their tribological performance as additives in rapeseed oil (RSO) was evaluated using a four-ball wear tester. their anti-corrosive properties and thermal stability were also examined. The worn surface of the steel ball was analyzed by means of scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results showed that 2-mercaptobenzothiazole derivatives exhibited excellent anti-corrosive property and high thermal stability. More over, they both had good load-carrying capacities and anti-wear and friction-reducing properties. The P_B values ​​of samples were in the following order: LBNS> LBN> RSO. The results of XPS examination illustrated that the excellent tribological behavior of the prepared compounds used as addi tives in RSO was attributed to the formation of a protective lubrication film on the worn surface, which consisted of an adsorption layer and a reaction layer containing Fe_3O_4, FeS, Fe_2 (SO_4) _3, FeB, and organic nitrogen-containing compounds.