海洋气候大气腐蚀过程环境因素对薄液膜内物质传递的影响

Effect of Environmental Factors on Material Transfer in Thin Liquid Film During Atmospheric Corrosion Process in Marine Environment

通过多因素正交试验模拟了湿热海洋环境下受盐雾影响的金属大气腐蚀过程,研究了稳态环境条件下表面覆盖薄液膜的Cu腐蚀机理。根据温度、湿度等环境条件计算了液膜的状态变化,分析了不同厚度与Cl^(-)浓度的薄液膜下溶解氧的迁移过程,最终通过对比试验与理论计算结果,揭示了环境因素对薄液膜尺寸、浓度等状态与腐蚀传质动力学过程的影响关系。

The occurrence of atmospheric corrosion is always companied initially with the formation of electrolyte film on the surface of metals,and then the corrosion process is affected by soluble substances such as oxygen from the surrounding environment and the nature of metals themselves.The process of atmospheric corrosion reaction relates to the phase transition of the gas,solid,and liquid substance,as well as the material transfer among different phases.This study simulated the atmospheric corrosion process of the pure copper plate in humid and hot environmental conditions as well as sea fog atmosphere by the multi-factor orthogonal corrosion test.The corrosion mechanism of copper plates beneath thin liquid films in steady state environment was also studied.By calculating the state changes of the thin liquid film with the variation of temperature,humidity and other environmental conditions,the migration process of dissolved oxygen within the thin liquid films of different thicknesses and Cl^(-)concentrations was analyzed.The influence of environmental factors on the thin liquid film,electrolyte concentration,and corrosion kinetics was revealed eventually by comparing the experimental data and theoretical calculation results.