Tribofilm physical parameters

C) The effect ofphysical parameters on tribofilm chemistry. The effect of physical parameters (adsorption, rubbing, temperature, concentration, load, surface roughness, tribofilm thickness) and on the chemistry of tribofilms was studied by many investigators, see Table 4.3. 

Physical parameters and the chemical nature of antiwear tribofilms... 

A) The mechanism of antiwear tribofilm formation. A new mechanism and chemistry for antiwear tribofilm formation is proposed from XANES spectra after considering many effects of physical parameters is summarized in Table 4.3, and discussed below ... 

Physical parameters By using Table 4.3. The effect of physical parameters such as adsorption, rubbing, temperature, concentration, load, surface roughness on antiwear performance of ZDDPs , which term is described by the physical parameter (a) the tribofilm accumulated on the surface becomes thicker with adsorption time (b) long-chain phosphates are formed on the topmost surface, but short-chain phosphates were present in the bulk (c) sulfur and phosphorus ratio changes with rubbing time and (d) when load increased the concentration of (S) and decreased that of (P) ... 

Innumerable tribologieal researeh papers have demonstrated the eflfeetiveness of the derivatives of thiophosphorie aeids, sueh as the elass of zine dithiophosphates, as lubri-eant additives for ferrous materials. In the last 20 years, great progress has been made in determining the surfaee eomposition of the films formed—even if the meehanism of film formation from mixed-element additives is poorly understood and sometimes eontradictory. This might be due to differences in temperature, test duration, applied load, and, last but not least, different in situ and ex situ analytical techniques and their individual effects on tribofilm composition. The aim of the present study is to assess the respective roles of physical and instrumental parameters. 

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