Potassium borate/graphene nanocomposite lubricant additive with anti-friction/wear and anti-corrosion functions for marine diesel engine burning low sulfur fuel

• Published in: Wear Vol. 550-551; p. 205395
• Main Authors: Hou, Xianbin, Tang, Huahao, Dai, Leyang, Li, Xianglin, Lan, Guanglin, Ai, Zhiqiang, Jiang, Yanhua, Sheng, Chenxing, Wan, Hong
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.07.2024
• Subjects: Anti-friction/wear and anti-corrosion; Low sulfur fuel; Marine diesel engine; Potassium borate/graphene lubricant additive; Anti-friction/wear and anti-corrosion; Potassium borate/graphene lubricant additive; Marine diesel engine; Low sulfur fuel
• ISSN: 0043-1648; 1873-2577
• DOI: 10.1016/j.wear.2024.205395

To suppress the corrosion and wear of cylinder liner of marine diesel engine burning low sulfur fuel, potassium borate/graphene lubricant additive was prepared by plasma assisted ball milling. Tribological tests were conducted by simulating operating condition of diesel engine to evaluate the anti-friction/wear and anti-corrosion properties of potassium borate/graphene additive. The effect of additive on cylinder liner corrosion and wear was verified by bench test of diesel engine. The results of tribological tests indicated tribochemical reaction occurred on the surface of the cylinder liner-piston ring and generated a tribochemical film composed of graphene, FeO, Fe2O3, Fe3O4, B2O3 and Fe2B with anti-friction/wear and anti-corrosion properties. Bench test shown that potassium borate/graphene additive had good anti-friction/wear and anti-corrosion functions, and reduced fuel consumption and exhaust emissions of the engine. •The cylinder liner, piston ring, cylinder oil and cylinder oil residue obtained from the vessel of “Han Ren” were used as experimental lubricating oil and experimental materials.The cylinder liner, piston ring, cylinder oil and cylinder oil residue obtained from the vessel of “Han Ren” (Type of vessel: general cargo ship. Power source: diesel engine. Type of the application engine: MAN B&W 6S42MC7) were used as experimental lubricating oil and experimental materials.•The anti-friction/wear and anti-corrosion properties of PB/GN in cylinder oil and cylinder oil residue under different working conditions were studied by using disk-pin friction pair to simulate the reciprocating movement of cylinder liner and piston ring of marine diesel engine burning low sulfur fuel.•The suppression effect of PB/GN on cylinder liner wear and corrosion under diesel engine combustion condition were verified by bench test.•The anti-friction/wear and anti-corrosion mechanism of the additive was studied by surface analyses (SEM, EDS, Raman and XPS) of the worn surface under different load and different temperature.