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    承力快卸锁的局部腐蚀及防护的数值模拟

    Numerical Simulation of Localized Corrosion and Protection of Bearing Quick Release Latches

    • 摘要: 针对承力快卸锁的局部腐蚀进行防护涂层优选。采用COMSOL软件,基于二次电流分布物理场建立了承力快卸锁的三组件的电偶腐蚀模型。通过电化学试验测量了不同涂层的电化学参数,并将其导入COMSOL软件。比较了各组件的阳极电流密度和腐蚀深度,确定了最佳保护方案:球面底座为Ti-6Al-4V阳极氧化+MoS2涂层;收口螺母为17-7PH钝化+MoS2涂层;螺母支座为17-7PH钝化+MoS2涂层。盐雾试验结果验证了承力快卸锁腐蚀主要是局部积水导致的电偶腐蚀,且局部积水区域腐蚀速率大于其他区域。通过COMSOL软件模拟,可为结构件的涂层优选提供新的思路,节省时间和经济成本。

       

      Abstract: Optimal selection of protective coatings for localized corrosion of load-bearing quick release locks was carried out. Using COMSOL software, a galvanic corrosion model for three components of a load-bearing quick release lock was established based on the physical field of secondary current distribution. The electrochemical parameters of different coatings were measured through electrochemical experiments and imported into COMSOL. The anode current density and corrosion depth of each component were compared, and the optimal protection scheme was determined: the spherical base was Ti-6Al-4V anodized+MoS2 coating; the closing nut was passivated with 17-4PH and coated with MoS2; the nut support was 17-7PH passivated+MoS2 coated. The salt spray test results confirmed that the corrosion of the load-bearing quick release lock was mainly caused by galvanic corrosion due to localized water accumulation, and the corrosion rate in the localized water accumulation area was higher than that in other areas. Through COMSOL software simulation, new ideas can be provided for coating optimization of structural components, saving time and economic costs.

       

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