The heats of adsorption of zinc di n-alkyl dithio phosphates onto pure iron, cast iron and ferric oxide surfaces
作者:W.G. Jones、M.I. Pope
DOI:10.1016/0040-6031(88)87059-x
日期:1988.8
to octyl, is described. Heats of adsorption of these compounds from n-heptane solution on to pure iron, cast iron and ferric oxide have been determined by flow microcalorimetry. Negligible adsorption was observed on high purity iron; cast iron containing 2.8% carbon and ferric oxide both behaved in a similar manner, maximum heat of monolayer formation occurring with the n-butyl ZDDP. All the isotherms
摘要 二烷基二硫代磷酸锌用作润滑油中的抗氧化和抗磨添加剂。描述了从丙基到辛基的二正烷基二硫代磷酸锌 (ZDDP) 的同源系列的合成。这些化合物从正庚烷溶液吸附到纯铁、铸铁和氧化铁上的吸附热已通过流动微量热法测定。在高纯铁上观察到可忽略不计的吸附;含 2.8% 碳的铸铁和氧化铁的行为方式相似,单层形成的最大热量发生在正丁基 ZDDP 上。所有等温线均为高亲和型。看来由于吸附单层的形成而放出的热量最初随着烃链长度的增加而增加,反映了摩尔质量的增加。