摘要
文章选取了一款市售普通发动机油作为研究对象,研究了甲醇及其燃烧副产物对该润滑油主要性能的影响。微动摩擦磨损试验机(SRV)摩擦磨损试验(往复模式)结果显示:甲醇及其燃烧副产物对该发动机油的减摩抗磨性能具有较大的负面影响,使摩擦副的平均摩擦系数增大19%、磨损率增大54%。这是由于甲醇及其燃烧副产物与润滑油中的减摩抗磨剂二烷基二硫代磷酸锌(ZDDP)和二烷基二硫代氨基甲酸钼(MoDTC)发生反应,导致其析出所致。抗氧化试验结果显示:加入甲醇、甲醛、甲酸三者的混合物,使得该发动机油的起始氧化温度降低7℃,在210℃下的氧化诱导期缩短7 min。曲轴箱模拟试验表明:甲醇对结焦行为影响最大,而三者混合物的引入使得该发动机油的结焦评级达10级,结焦量增加400%。此外,甲醇及其燃烧副产物的加入会使润滑油碱值下降幅度增大,并导致黏度指数改进剂析出,从而使其运动黏度下降。
A commercially available regular engine oil was selected as the research subject of the paper,and the effects of methanol and its combustion by-products on the main properties of the lubricating oil were investigated.The results of the SRV friction-wear tests in reciprocating mode show that methanol and its combustion by-products have negative effects on the friction reduction and anti-wear properties of the engine oil,leading to the increase of the average friction coefficient by 19%and of the wear rate by 54%of the friction pair.This is because methanol and its combustion by-products react with friction reduction and anti-wear additive such as zinc dialkyldithiophosphate(ZDDP)and molybdenum dialkyldithiocarbamate(MoDTC)and separate them from the lubricating oil.Besides,the oxidation resistance test shows that adding a mixture of methanol,formaldehyde,and formic acid reduces the initial oxidation temperature of the engine oil by 7℃ and shortens the oxidation induction time(OIT)at 210℃ by 7 minutes.Moreover,crankcase simulation tests show that the methanol has the greatest influence on coking behavior,while the introduction of the ternary mixture gives a ten-grade coking rating and increases the coking amount by 400%.Furthermore,the addition of methanol and its combustion by-products will increase the drop rate of the base number of the lubricating oil and result in the precipitation of the viscosity index improver,thereby reducing its kinematic viscosity.
作者
张晟卯
张玉娟
李正浩
张平余
张治军
王卫攀
王硕
王学宇
ZHANG Sheng-mao;ZHANG Yu-juan;LI Zheng-hao;ZHANG Ping-yu;ZHANG Zhi-jun;WANG Wei-pan;WANG Shuo;WANG Xue-yu(Engineering Research Center for Nanomaterials of Henan University,Kaifeng,Henan 475004,China;Daoqi Science and Technology Co.,Ltd.,Zhengzhou,Henan 450000,China)
出处
《润滑油》
CAS
2024年第2期46-51,64,共7页
Lubricating Oil
基金
河南省重点研发专项(231111230600)
国家自然科学基金(21671053)。
关键词
甲醇燃油汽车
发动机油
摩擦学性能
抗氧化性能
结焦行为
methanol-fueled vehicle
engine oil
tribological property
oxidation resistance
coking behavior
