火箭推进

针对2A14铝合金局部硬质阳极氧化工艺进行了深入研究,提出以双重封闭后的铬酸阳极氧化膜代替传统的涂漆保护,作为2A14铝合金局部硬质阳极氧化的遮蔽层。利用极化曲线、阻抗谱(EIS)和点滴试验等测试方法,研究了双重封闭后铬酸阳极氧化膜的腐蚀行为,并与重铬酸钾封闭、水封闭后氧化膜进行比较。与重铬酸钾封闭、水封闭相比,双重封闭后铬酸阳极氧化膜的腐蚀电流密度下降2个数量级,氧化膜多孔层电阻Rp值提高500倍以上,氧化膜点滴试验时间提高2倍～5倍。结果表明,双重封闭技术能有效提高铬酸阳极氧化膜的封孔质量,增强了耐腐蚀、耐电压性能,可作为2A14铝合金局部硬质阳极氧化遮蔽层。采用该工艺制备的局部硬质阳极氧化膜均匀致密,厚度可达60 μm,平均硬度可达360,满足设计要求(厚度≥40 μm,硬度≥329)。

The local hard anodizing process of 2A14 aluminum alloy has been studied and it was proposed that the double-sealed chromic acid anodizing film can be used as the shielding layer for the local hard anodizing of 2A14 aluminum alloy instead of the traditional painted protection.The corrosion behavior of the double-sealed chromic acid anodizing film was studied by means of polarization curve, electrochemical impedance spectroscopy(EIS)and dropping test, which was also compared with the oxidation film sealed by potassium dichromate and water.According to the comparison results, after double sealing, the corrosion current density of the chromic acid anodizing film decreases by two orders of magnitude, the resistance Rp value of porous oxide film is increased by more than 500 times, and the dropping test time is increased by 2 to 5 times.The results show that the double-sealed technology effectively improved the sealing quality of the chromic acid anodizing film so that it can be used as the local hard anodizing shielding layer of 2A14 aluminum alloy with good corrosion resistance and voltage resistance.The local hard anodizing film prepared by this process is uniform and dense, with the thickness up to 60 μm and the average hardness up to 360, which meets the design requirements(thickness≥40 μm and hardness≥329).

引言
1 技术改进方案
2 试验研究
3 结果与分析
4 机理分析
5 产品验证
6 结论

表1 2A14铝合金主要成分<br/>Tab.1 Main composition of 2A14 aluminum alloy

表1 2A14铝合金主要成分
Tab.1 Main composition of 2A14 aluminum alloy

图1 局部硬质阳极氧化试块照片<br/>Fig.1 Photographs of local hard anodizing test coupon

图1 局部硬质阳极氧化试块照片
Fig.1 Photographs of local hard anodizing test coupon

图2 1 mol/L NaCl溶液中铬酸阳极氧化膜的动电位极化曲线测试结果<br/>Fig.2 Test results of potential dynamic polarization curves of chromic acid anodizing film in 1 mol/L NaCl solution

图2 1 mol/L NaCl溶液中铬酸阳极氧化膜的动电位极化曲线测试结果
Fig.2 Test results of potential dynamic polarization curves of chromic acid anodizing film in 1 mol/L NaCl solution

表2 不同封闭条件下的铬酸阳极氧化膜层的电化学参数<br/>Tab.2 Electrochemical parameters of chromic acid anodizing film under different sealing conditions

表2 不同封闭条件下的铬酸阳极氧化膜层的电化学参数
Tab.2 Electrochemical parameters of chromic acid anodizing film under different sealing conditions

图3 1 mol/L NaCl溶液中铬酸阳极氧化膜电化学阻抗谱图<br/>Fig.3 Electrochemical impedance spectroscopy of chromic acid anodizing film in 1 mol/L NaCl solution

图3 1 mol/L NaCl溶液中铬酸阳极氧化膜电化学阻抗谱图
Fig.3 Electrochemical impedance spectroscopy of chromic acid anodizing film in 1 mol/L NaCl solution

表3 不同封闭条件下铬酸阳极氧化膜层的电化学阻抗谱拟合数据<br/>Tab.3 Fitting date of electrochemical impedance spectroscopy of chromic acid anodizing film under different sealing conditions

表3 不同封闭条件下铬酸阳极氧化膜层的电化学阻抗谱拟合数据
Tab.3 Fitting date of electrochemical impedance spectroscopy of chromic acid anodizing film under different sealing conditions

表4 不同封闭条件的铬酸阳极氧化膜点滴试验结果<br/>Tab.4 Dropping test results of chromic acid anodizing film under different sealing conditions

表4 不同封闭条件的铬酸阳极氧化膜点滴试验结果
Tab.4 Dropping test results of chromic acid anodizing film under different sealing conditions

图4 阀体局部硬质阳极氧化照片<br/>Fig.4 Photographs of valve body after local hard anodizing

图4 阀体局部硬质阳极氧化照片
Fig.4 Photographs of valve body after local hard anodizing

表5 阀体膜层的检测结果<br/>Tab.5 Test results of valve body film

表5 阀体膜层的检测结果
Tab.5 Test results of valve body film

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备注

引言

1 技术改进方案

2 试验研究

3 结果与分析

4 机理分析

5 产品验证

6 结论

期刊信息