In this work, a series of experiments were conducted to evaluate the effect of applied potential on the tribocorrosion behavior of 410SS using a tribometer integrated with an electrochemical workstation. Results show that tribocorrosion rate of 410SS varies with applied potential and reaches a maximum at À0.1 V. By applying potential pulse method, it indicates that the repassivation kinetics of 410SS is much slower than general stainless steels.The XPS results reveal great changes in the composition of tribocorrosion products, which are enriched in Fe 3 O 4 and Fe(OH) 2 in the lower potential range while become Fe 2 O 3 , FeOOH, and Fe(OH) 3 at more positive potential. The characteristics of tribocorrosion products depend on surface chemistry which varies in compliance with applied potential, and thus, alters the tribocorrosion rate of 410SS. Moreover, the synergistic effect between wear and corrosion was quantified, showing that pure mechanical wear and corrosion-induced wear were the main reasons for the degradation of 410SS.
This work is focused on the influence of solution pH on the tribocorrosion behavior of a tribosystem between nickel aluminum bronze (NAB) and Al 2 O 3 . To explore the interaction mechanism between wear and corrosion, a pin-on-disc tribometer equipped with a potentiostat was used and the frictional, electrochemical responses were reported in situ during tribocorrosion processes as a function of the solution pH. Results revealed that a high pH solution would aggravate corrosion and give rise to accelerated material loss. In addition, the corrosion mechanism of NAB was dependent on solution pH, that is, the NAB oxidation was driven by the dissolution of Κ II phase at pH below 4.2, whereas its anodic behavior was dominated by the preferential corrosion attack of copper-rich α-phase within the α + Κ III eutectoid when pH was higher than 4.2. Combined with quantitative calculation at various pHs, it was found that the pure mechanical and corrosion-accelerated wear, presented delamination and abrasion, were the main reasons for material degradation.
K E Y W O R D Scorrosion, nickel aluminum bronze, synergistic effect, wear
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