SURFACE-CHEMISTRY OF CHLORINATED-HYDROCARBON LUBRICANT ADDITIVES - PART II - MODELING THE TRIBOLOGICAL INTERFACE

In Part I (1), the concept of ''Type I'' antiseizure behavior for chlo rinated hydrocarbons in extreme-pressure (EP) lubrication of ferrous m etals was introduced; interfacial temperature measurements and surface analyses revealed that a solid lubricating layer consisting of ferrou s chloride (FeCl2) and carbon prevents seizure and acts as a solid lub ricant at less than similar to 1000 K. In this paper, careful measurem ent of the film growth and removal rates successfully rationalizes thi s tribological behavior. Thermodynamic calculations also show that iro n carbides are favored at higher decomposition temperatures. Analysis of films formed from the thermal decomposition of carbon tetrachloride (CCl4) and chloroform (CHCl3) at similar to 1000 K using Mossbauer sp ectroscopy demonstrates that iron carbide is indeed formed in this cas e; tribological measurements also confirm this material as critical an tiseizure material at high loads in ''Type II'' tribological behavior for chlorinated hydrocarbons with ferrous metals.