醋酸钾型除冰液薄液膜厚度对飞机用2024铝合金腐蚀电化学行为的影响

Corrosion Electrochemistry Behavior of 2024 Aluminum Alloy Under Thin Electrolyte Layers of Potassium Acetate Deicing Fluid

利用新型低温薄液膜腐蚀实验装置,对飞机用2024铝合金在低温(-5℃)条件下的醋酸钾型除冰液薄液膜下的电化学腐蚀电化学行为进行了研究。结果表明:在较薄(低于240μm)的除冰液薄液膜下飞机用铝合金腐蚀电流密度随液膜厚度增加而增加,电荷转移电阻1/R ct随薄液膜厚度增加而增加;在较厚(高于240μm)的除冰液薄液膜下飞机用铝合金腐蚀电流密度随液膜厚度增加而减小,电荷转移电阻1/Rct随薄液膜厚度增加而减小。研究表明除冰液薄液膜对飞机铝合金的腐蚀速度随薄液膜厚度增加呈现先增加后减小的规律。

A new low-temperature thin electrolyte layers corrosion experimental device is used to study the electrochemical corrosion and electrochemical behavior of 2024 aluminum alloy for aircraft under the electrolyte layers for low temperature(-5℃)of potassium acetate deicing liquid.The results show that under thin electrolyte layers(less than 240μm)of deicing liquid,the corrosion current density of aircraft aluminum alloys increases with the thickness of the thin electrolyte layers,and the charge transfer resistance 1/R ct increases with the thickness of the thin electrolyte layers.Corrosion current density of aircraft aluminum alloy decreases with the increase of electrolyte layers thickness under thicker(more than 240μm)of deicing liquid,and the charge transfer resistance 1/R ct decreases with the increase of thin film thickness,indicating that The corrosion rate of the thin liquid film of ice liquid on aircraft aluminum alloys increases first and then decreases with the increase of the thickness of the thin liquid film.