Pendulum tribometer

In contrast to film materials, express estimates of the protective ability of inhibited structural plastics have been insufficiently elaborated so far. For example, the effect of inhibited plastics on the wear rate of metal samples has been studied by the authors of [100] using a pendulum tribometer containing a plastic-metal friction pair. Corrosion tests of systems such as inhibited structural plastic-metal counterparts are usually conducted in real operation regimes [44]. 

Model experiments were carried out to study the relation between friction and kinetics of electrochemical processes occurring during polarization of metal-polymer pairs [62]. The experiments employed a pendulum tribometer 1 (Fig. 4.14a) whose advantage is the presence of only one friction pair for examination at a time. The tribometer consists of a pendulum 2, a support 3, and a prism 4 on which the pendulum hangs. Support 3 is made as a vessel containing an electrolyte into which the friction surface in the form of one of the prism faces is immersed. The pendulum is set in motion at a constant initial amplitude. Attenuation of oscillations is recorded in terms of contracting amplitudes of the sinusoidal signal from the inductive pickup 6, into which the bow-shaped core 5 is in turn inserted as the pendulum oscillates. 

Fig. 4.14. Scheme of a pendulum tribometer (a) and electrochemical cell for polarization of the friction zone (b) (1) tribometer (2) pendulum (3) support (4) prism (5) bow-shaped core (6) inductive pickup (7) rectifier unit with a generator (8) amplifier (9) self-recording potentiometer (10) voltage stabilizer (11) electrolyte (12) platinum electrode (13) metal tray (14) electrolytic switch (15) vessel with electrolyte (16) reference electrode (17) potentiostat... 

A pendulum tribometer (see Fig. 4.14) whose prism was made of a PE-based composite, mineral oil and Cl were used in the investigations. Cl of the class of surfactants with a carboxyl or hydroxyl group (inhibitors of series A), as well as organic amines and sulfur acids (B set) readily dissolving in oils thanks to the hydrocarbon part of macromolecules were used in the experiments. Compositions with different PE content were prepared for each inhibitor type. Formulation 1 had 36 wt %, formulation 2 had 45 wt % and formulation 3 had 65 wt %. The trays (prism support) were made of copper, aluminum, and carbon steel. 0.1 N solution of Na2S04 was used as the... 

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See also in sourсe #XX -- [ , ]

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