径向力对Inconel690合金在碱性溶液中微动腐蚀的影响

Influence of Radial Force on Fretting Corrosion of Inconel 690in Alkaline Solution

研究了在NaOH(pH=9. 8)溶液中,不同径向力下Inconel 690合金的微动腐蚀行为。试验结果表明,径向力对690合金在微动过程中的微动区域特性、微动行为和电化学行为有着重要的影响。当微动区域处于完全滑移区时,随着径向力的增加,微动磨损量持续增加,钝化膜的破坏导致微动磨损表面更加活跃,Inconel 690合金更容易发生腐蚀,但随后的氧化反应会在一定程度上修复钝化膜,从而导致腐蚀的降低。随着径向力的进一步增加,微动区域从完全滑移区转变为部分滑移区,材料微动磨损量和腐蚀明显减小,钝化膜逐渐变得稳定。

Fretting corrosion behavior of Inconel 690 in NaOH solution （pH =9.8） at different radial forces is investigated. The test results indicate that the slip regime, wear behavior and electrochemical behavior strongly depend on the radial force. When the fretting regime is in gross slip regime, the fretting wear volume will increase with the increase of radial force. Fretting wear surface is found to be more active and more prone to be corrosive due to the break of protective passive film, and the corrosion resistance of material decreases with the increase of radial force. The passive film is subsequently repaired by oxidation reaction, which leads to the decrease of corrosion reaction. By comparison, when the fretting regime is changed to partial slip regime, fretting wear volume and corrosion reaction decrease significantly, and the passive film is not easy to be broken with further increase of radial force.