690TT合金高温高压微动磨损-腐蚀耦合机制研究OA

In order to investigate the effects of sodium chloride concentration on the fretting wear-corrosion behavior of 690TT alloy under high temperature,high pressure and random vibration conditions,by constructing flow-induced vibration working condition,combined with profile measurements,SEM analysis,EDS line scan and potentiodynamic polarization curve testing,the damage characteristics of 690TT alloy were systematically evaluated.The results show that as the sodium chloride concentration increases from 0 mol/L to 0.1 mol/L,the maximum wear depth increases from 15 μm to 19 μm,and the total damage volume increases from 17.284×106 μm³ to 82×106 μm³.The corrosion current density after fretting is generally higher than in the stationary state.The corrosion current density is 3.27×10-3 A/cm² under 0.1 mol/L sodium chloride concentration.The wear-corrosion synergistic factors at each sodium chloride concentration are greater than 1,with the overall synergistic factor α increasing from 2.82 to 10.3.The synergistic effect damage volume accounting for over 60%of the total damage volume,indicating that the interaction between wear and corrosion cannot be neglected in high temperature and pressure chloride environments.The research reveals the influence mechanism of sodium chloride concentration on the wear-corrosion coupling behavior in high temperature and pressure environments,which can provide a theoretical basis for the life assessment of alloy materials under harsh service conditions such as nuclear power.