【作者】

Catherine AMBLARD，Serge ESSON

【摘要】

论文已在中国上海举行的2013年CIMAC大会上发表。论文的版权归CIMAC所有。 As a result of the drastic lowering of sulphur content in HFO or the introduction of LNG fuel,the basicity of future generation Marine Cylinder Lubricants should be decreased provided a high level of neutralization efficiency can be maintained. The efficiency of the neutralization reaction will be a key parameter if specific engine operating modes and future engine designs are more likely to produce acids and therefore more sensitive to corrosive wear. Such protection can be delivered by using innovative ashfree neutralising chemistries to replace the traditional CaCO3 which has been shown to be a poor neutralising agent and prone to generate hard deposits during oil degradation. With the objective to differentiate and quantify this basicity efficient and further to the publication of the Efficient BASicity (EB- AS) concept (ISME2011, paper 528) , we have developed an analytical method, derived from ASTM D4739. The chemical background to this method is described, as well as experimental details, such as repeatability, reproducibility, selectivity and discriminating ability. EBAS is complementary to BN (ASTM D-2896), therefore the two values should qualify the neutralization capability of a finished lubricant. We also report on our in service experience with such methods and our efforts to correlate them with engine reliability. Monitoring 2-stroke engines in service is the way to correlate and couple EBAS/BN with Fe content of drain oils, or to other indicators of engine condition such as the position in the viscosity-basicity diagram (ISME 2011, paper 529) .

【会议名称】

第27届CIMAC会议

【会议地点】

上海

【下载次数】

1

返回