In this paper, taking a certain type of high-power diesel engine exhaust valve abnormal wear phenomenon as an example, we conduct research on the exhaust valve surface micromorphology characteristics, contact surface accumulation products, additive transition layer, and combustion test. These passed diesel sulfur content comparative test, diesel additive composition analysis, and high-sulfur-content and low-sulfur-content diesel and diesel oil additive action test. At present, there is no authoritative research on the influence of sulfur content in diesel on valve seat wear of high-power diesel engines, and the protection mechanism of diesel additives on the valve seat is not clear. The sulfur in diesel, like the lead in gasoline, has long been known to resist wear in the valve seats of high-power diesel engines; just as gasoline additives compensate for the loss of lead, diesel oil additives seem to compensate for the loss of sulfur. Tests show that a uniform carbon deposition layer is formed on the contact surface after the diesel is burned, and the carbon deposition layer is more densely and uniformly adsorbed on the contact surface under the action of diesel additives to form an antiwear layer. Tests also show that the sulfur in diesel has no effect on the wear resistance of the valve seat.

中文翻译：

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硫及添加剂对气缸盖排气阀座磨损的影响

本文以某型大功率柴油机排气门异常磨损现象为例，对排气门表面微观形貌特征、接触面堆积产物、添加剂过渡层、燃烧试验等进行研究。这些产品通过了柴油硫含量对比试验、柴油添加剂成分分析、高硫和低硫柴油和柴油添加剂作用试验。目前还没有关于柴油中硫含量对大功率柴油机气门座磨损影响的权威研究，柴油添加剂对气门座的保护机理也不清楚。长期以来，柴油中的硫和汽油中的铅一样，可以抵抗大功率柴油发动机气门座的磨损。正如汽油添加剂弥补了铅的损失，柴油添加剂似乎弥补了硫的损失。试验表明，柴油燃烧后在接触面上形成了均匀的积碳层，在柴油机添加剂的作用下，积碳层更致密、均匀地吸附在接触面上，形成抗磨层。试验还表明，柴油中的硫对阀座的耐磨性没有影响。