飞机起落架镀镉4130钢在甲酸钾溶液薄液膜下腐蚀电化学行为研究

doi:10.11902/1005.4537.2016.221

中国腐蚀与防护学报

2017, Vol. 37

Issue (6): 567-574 DOI: 10.11902/1005.4537.2016.221

研究报告

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飞机起落架镀镉4130钢在甲酸钾溶液薄液膜下腐蚀电化学行为研究

林修洲^1,²(

), 杨丽², 梅拥军³, 郑兴文¹, 罗淑文³, 崔学军^1,²

1 四川理工学院材料腐蚀与防护四川省重点实验室自贡 643000
2 四川理工学院材料科学与工程学院自贡 643000
3 中国民航局第二研究所成都 610041

Corrosion Electrochemical Behavior Beneath Thin Electrolyte Layer of Potassium Formate Solution of Cd-plated 4130 Steel Used for Aircraft Landing Gear

Xiuzhou LIN^1,²(

), Li YANG², Yongjun MEI³, Xingwen ZHENG¹, Shuwen LUO³, Xuejun CUI^1,²

1 Materials Corrosion and Protection Key Laboratory of Sichuan Province, Sichuan University of Science ＆ Engineering, Zigong 643000, China
2 School of Materials Science and Engineering, Sichuan University of Science ＆ Engineering,Zigong 643000, China
3 The Second Research Institute of CAAC, Chengdu 610041, China

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摘要:

采用自制薄液膜腐蚀试验装置,研究了飞机起落架镀镉AISI 4130钢在低温除冰液 (主要成分甲酸钾) 薄液膜下的腐蚀电化学行为。结果表明：镀镉4130钢在甲酸钾溶液中的腐蚀过程主要受氧扩散控制,薄液膜下腐蚀产物沉积对腐蚀过程产生较大影响。液膜较厚 (≥240 μm) 时,液膜厚度变化对阴极极限扩散电流密度和溶液电阻影响不大;液膜较薄时,阴极极限扩散电流密度和溶液电阻随液膜厚度减小而增大。在相同液膜厚度下,镀镉4130钢腐蚀电位随溶液浓度增大而降低。在低浓度甲酸钾溶液中,镀镉4130钢腐蚀速率较低,腐蚀电位和腐蚀速率受液膜厚度影响不大。在高浓度甲酸钾溶液中,镀镉4130钢腐蚀电位随液膜厚度减小而正移;薄液膜下腐蚀速率明显高于全浸,且随液膜厚度减小先增大后减小,在液膜厚度约为150 μm时出现极大值。

关键词 ：镀镉4130钢, 甲酸钾溶液, 除冰液, 薄液膜, 腐蚀电化学

Abstract：

The Cd-plated AISI 4130 steel is being widely used for aircraft landing gear and potassium formate is the main composition of the common deicing fluid. Therefore, it is worthy to investigate the corrosion electrochemical behavior of Cd plated AISI 4130 steel beneath thin electrolyte layer of potassium formate solution at low temperature. Results showed that the corrosion process of the Cd-plated AISI 4130 steel in potassium formate solution is mainly controlled by the diffusion of dissolved oxygen, and influenced by the deposition of corrosion product beneath the thin electrolyte layer. When the thickness of the electrolyte layer is higher (240 μm or more), there is little influence of the thickness of the electrolyte layer on the cathodic limited diffusion current density and solution resistance. When the thickness of the electrolyte layer is thinner, the cathodic limited diffusion current density and solution resistance are increased with the decrease of the thickness of the electrolyte layer. For the same thickness of the electrolyte layer, the corrosion potential of the Cd-plated AISI 4130 steel decreases with the increase of solution concentration. For the dilute solutions, the corrosion rate of the Cd-plated AISI 4130 steel is lower, and the corrosion potential and corrosion rate are less affected by the thickness of the electrolyte layer. When the concentration of potassium formate solution is higher, the corrosion potential of the Cd-plated AISI 4130 steel is positively shifted with the decrease of the thickness of the electrolyte layer. The corrosion rate of the Cd-plated AISI 4130 steel beneath thin electrolyte layer is obviously higher than that of full immersion test, and the corrosion rate for the former case increased first and then decreased with the decreasing thickness of the electrolyte layer, and reached the maximum value when the thickness of the electrolyte layer is about 150 μm.

Key words： AISI 4130 steel plated by cadmium potassium formate solution deicing fluid thin electrolyte laye corrosion electrochemistry

收稿日期: 2016-11-21

ZTFLH:

TG172

基金资助:国家自然科学基金 (U1333103和U1633118),四川省青年科技创新研究团队项目 (2016TD0024) 和四川理工学院人才引进项目 (2016RCL12)

作者简介:

作者简介林修洲,男,1974年生,博士,教授

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引用本文:

林修洲, 杨丽, 梅拥军, 郑兴文, 罗淑文, 崔学军. 飞机起落架镀镉4130钢在甲酸钾溶液薄液膜下腐蚀电化学行为研究[J]. 中国腐蚀与防护学报, 2017, 37(6): 567-574.
Xiuzhou LIN, Li YANG, Yongjun MEI, Xingwen ZHENG, Shuwen LUO, Xuejun CUI. Corrosion Electrochemical Behavior Beneath Thin Electrolyte Layer of Potassium Formate Solution of Cd-plated 4130 Steel Used for Aircraft Landing Gear. Journal of Chinese Society for Corrosion and protection, 2017, 37(6): 567-574.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.221 或 https://www.jcscp.org/CN/Y2017/V37/I6/567

图1 薄液膜腐蚀试验装置示意图

图2 镀镉4130钢在不同厚度的25%甲酸钾薄液膜下的阴极极化曲线

图3 镀镉4130钢实验前后的表面形貌

图4 实验后试样表面EDS分析结果

图5 镀镉4130钢腐蚀电位与极限扩散电流密度随甲酸钾溶液浓度的变化

图6 镀镉4130钢腐蚀电位与极限扩散电流密度随薄液膜厚度的变化

图7 镀镉4130钢在不同厚度的25%甲酸钾溶液薄液膜下的电化学阻抗谱

图8 腐蚀体系的等效电路模型

表1 EIS拟合得到的腐蚀体系部分参数值

图9 溶液电阻随薄液膜厚度的变化

图10 1/Rt随薄液膜厚度的变化

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