The multiple roles of a chemical tribofilm in hydrogen uptake from lubricated rubbing contacts

Abstract

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Thermo-mechanical analysis of hydrogen permeation in lubricated rubbing contacts

“…This novel apparatus enables quantitative measurement of hydrogen permeation from a lubricated contact. This method was employed to study the effect of water contamination, anti-wear and friction modifier additives on tribologically-induced hydrogen uptake from a lubricated interface [13,23].…”

“…Some of these hydrogen atoms diffuse into the metal membrane and the rest form hydrogen molecules and escape from the surface. Details of this measurement technique can be found in [23].…”

“…Once the rubbing started, the oxidation current is captured every 10 s. The hydrogen permeation transient curve and its key features were described previously [13]. Mathematical analysis derived from the Fick's second law can be used to calculate total amount of hydrogen permeation into the steel [23]. Each experiment was repeated at least twice, where the permeation current density was calculated using the average over a longer period of time in the plateau region.…”

“…In this work a combination of computational modeling and experimental results are employed to investigate the complex interplay between operational factors and the hydrogen uptake rate into the steel. A newly developed in-situ measurement technique [13,23] is used to monitor hydrogen intrusion into the steel under various temperature and pressure testing conditions. A reactive MD model is developed to explore experimental measurements through a close replica of the actual tribochemical environment.…”

A review of advances in tribology in 2020–2021

“…It is reported that the wear resistance of titaniummatrix composite (TMC) against M35 steel was improved by adding multilayer graphene (MLG)/Fe 2 O 3 nanocomposite and MLG + Fe 2 O 3 mechanical mixture into base oil, but the addition of MLG or Fe 2 O 3 had no effect [339]. Esfahani et al [340] found that the tribofilm formation of zinc dialkyldithiophosphate (ZDDP) and molybdenum dithiocarbamate (MoDTC), www.Springer.com/journal/40544 | Friction as well as water contamination in oil can impede hydrogen ingress in the steel substrate, by impeding the formation of fresh metal surfaces. This reduces the generation of hydrogen atoms by preventing the decomposition of hydrocarbon molecules.…”