Mapping the fretting corrosion behaviors of 6082 aluminum alloy in 3.5% NaCl solution

Abstract

The fretting-corrosion performance of 6082 aluminum alloy in 3.5% NaCl solution was investigated in this work. The effects of displacements (5–50 μm) and loads (10–80 N) were considered. A running condition fretting map (RCFM) was established, which was composed of partial slip regime (PSR), mixed fretting regime (MFR), and slip regime (SR). In PSR and MFR, the worn surface could be divided into the outer micro-slip zone and the central sticking zone and the wear mechanism was mainly adhesive wear with slight corrosion. In SR, the whole contact surface was in slip, and the wear mechanism was mainly severe abrasive and corrosive wear. Compared to the static corrosion, the corrosion of 6082 alloys in MFR and SR was accelerated. However, the corrosion in PSR was weakened, which may result from the lackage of oxygen in the contact zone. The wastage level, the dominant mechanism of fretting corrosion, and synergy between corrosion and wear under different loads and displacements were quantitatively analyzed, and micro-abrasion-corrosion maps were constructed.