Electrochemical and Wear Behavior of TC4 Alloy in Marine Environment
With the rapid development of utilization and exploitation of deep-sea resources,the de-mand of marine engineering structural materials with lightweight and corrosion-resistant becomes urgent.TC4 alloy has attracted widespread attention for its excellent strength and corrosion resistance in seawa-ter.Herein,the electrochemical behavior and friction-wear performance of TC4 alloy in simulated seawa-ters with different pH value is studied.The alloy performs better in the neutral simulated seawater(pH=7)rather than in the acidic ones(pH=2).After examination of the friction and wear behavior of TC4 alloy in the simulated seawater,it is indicated that the presence of seawater is favorite the reduction of the fric-tion coefficient and wear loss.The existence of the seawater made the wear mechanism changed from the oxidative-and abrasive-wear in air to the corrosive-and fatigue-wear.At the same time,through the experiments by the combination of electrochemical corrosion-wear loading in the simulated seawater,it follows that by the combined action of sea water and the cyclic wear load,the passivation film on the TC4 alloy surface may experience alternating damaging-and repairing-processes.When the damage speed of passivation film exceeds repair speed,its protective effect no longer exists,in other word,the dam-aged passivation film may accelerate the TC4 alloy corrosion.However,when the cyclic load is removed,the passivation film of TC4 alloy may completely be repaired in the simulated seawater.
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