Impact-sliding fretting tribo-corrosion behaviors of Inconel 690 alloy pretreated with HTHP immersion for different durations

Abstract

This study subjected Inconel 690 alloy tubes to pre-immersion treatment in high-temperature and high-pressure (HTHP) artificial seawater (3.5 wt% NaCl) for different days (untreated, 1 day, 2 days, and 3 days). Then, impact-sliding fretting tribo-corrosion test rig was used to investigate its damage failure mechanism and electrochemical-corrosion dynamic response behaviors. Results showed that the oxidized corrosion layer that formed among the Inconel 690 alloy tubes surface increasingly densified with increased pre-immersion duration. These reduced the damage degree of fretting interface. However, the pre-formed oxidized corrosion layer accelerated the alloy tube’s electrochemical corrosion process. Additionally, the main impact-sliding fretting tribo-corrosion mechanisms of all test samples were abrasive wear, plastic deformation, and spalling.