Análise tribológica na interface aço carbono SAE 1020 e poliamida 11 em sistemas de deslizamento automotivos

Abstract

Sliding systems with interface formed by low alloy steels and various polymers are widely used in the automotive industry in torque transmission systems subjected to axial loading. Usually these systems are coupled to steering systems and interact almost directly with the final user of the vehicle. To know the most severe wear conditions which these systems are submitted and attempt to overcome them, the tribological analysis was proposed on tribometer of the pin-on-disk type, on an interface formed by SAE 1020 steel with polyamide 11 in distilled water, 5 wt% aqueous solution of sodium chloride and 184,21 g/l natural sand aqueous solution in accordance with the automotive technical standards VW PV1210: 2010-02 and VW PV2982: 2013-07. The tests were performed at frequencies of 3.0 Hz and 1.5 Hz with a fixed amount of rotation of 10,000 cycles. The corrosion potential on open circuit was monitored throughout the test and the wear rate was calculated. It was highlighted higher friction coefficients, higher wear rates and higher corrosion potential amplitudes in samples assayed in sand solution; with milder values for the samples tested in distilled water and intermediate values for samples tested with sodium chloride solution.