Study of surface films of the ZDDP and the MoDTC with crystalline and amorphous overbased calcium sulfonates by XPS

被引：24

作者：

Costello, Michael T. ^{[1
]}

Urrego, Roberto A. ^{[1
]}

机构：

[1] Crompton Corp, Middlebury, CT 06749 USA

来源：

TRIBOLOGY TRANSACTIONS | 2007年 / 50卷 / 02期

关键词：

overbased sulfonate; sulfurized olefin; molybdenum dithiocarbamate; XPS; four-ball EP; surface chemistry; metalworking lubricants;

D O I：

10.1080/10402000701271051

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The role of amorphous or crystalline overbased detergent and sulfur containing AW/EP additives on the surface films created in a tribometer was investigated. In the crystalline overbased sulfonate containing samples the weld point was higher than for the equivalent blend using an amorphous overbased sulfonate. The calcium carbonate core of the overbased sulfonates was deduced to be present in the surface film when combined with either ZDDP or MoDTC. For samples containing ZDDP the crystalline overbased sulfonate, reduced the phosphate film, thickness, while for the MoDTC it reduced the MoS2 film thickness. In both cases significantly more carbon, likely as calcium carbonate (which acts to improve the EP/AW properties of the lubricant), was present when using the crystalline overbased calcium sulfonate compared to the amorphous overbased calcium sulfonate.

引用

页码：217 / 226

页数：10

共 19 条

[1]

Bovington C.H, 1997, CHEM TECHNOLOGY LUBR, P320

[2] Study of surface films of amorphous and crystalline overbased calcium sulfonate by XPS and AES [J].