《Table 4 Effects of ZDDP and ZDDC on lead corrosion》

《Table 4 Effects of ZDDP and ZDDC on lead corrosion》   提示:宽带有限、当前游客访问压缩模式
本系列图表出处文件名:随高清版一同展现
《A Study of Lead Corrosion of Diesel Engine Oil》


  1. 获取 高清版本忘记账户?点击这里登录
  1. 下载图表忘记账户?点击这里登录

The sulfur-containing multi-functional additives ZDDP and ZDDC were added separately into the same baseline formulation comprising identical base oil blend,viscosity index improver and detergent,dispersant,etc.,to determine their effects on lead corrosion.The results in Table 4show a decrease of lead weight loss with the increase of ZDDP dosage.This fact indicates that ZDDP was effective to inhibit lead corrosion.However,the improvement in lead corrosion was not significant when the ZDDP dosage was greater than 2.0%.Too high a dosage of ZDDP in fully formulated lubricants would have an adverse effect on the wear protection performance[7].Therefore,the ZDDP treat level in engine oil should be controlled to be no more than adequate to protect the engines.Table 4shows the effect of ZDDC on lead corrosion.Similarly,lead weight loss decreased with the increase of ZDDC dosage.However,the lead corrosion inhibition effect of ZDDC was less significant than ZDDP at the same or similar treat level.This indicates that the ZDDP is a more effective lead corrosion inhibitor than ZDDC.