基于腐蚀电流的加速腐蚀关系可靠性模型

Reliability Model of Accelerated Corrosion Relationship Based on Corrosion Current

目的通过对加速腐蚀关系的研究,为飞机的日历寿命的确定提供依据。方法首先提出基于腐蚀电流的加速腐蚀关系可靠性模型,并通过测试极化曲线的方法得到LY12和ZL115两种飞机常用铝合金材料在蒸馏水及不同浓度Na Cl溶液中的腐蚀电流。结果由于材料缺陷分布的随机性,铝合金的腐蚀电流具有随机特征,且随着盐浓度的增加而增大。两种铝合金材料的加速腐蚀关系系数在统计上存在较大的差异,在3.5%盐浓度下(温度)考虑95%置信度的加速腐蚀关系系数,LY12铝合金为3.53、ZL115为2.32。结论本文基于腐蚀电流的加速腐蚀关系的研究可以很好地为飞机日历寿命确定提供依据。

Objective To provide a basis for determining the calendar life of aircraft through studying the relationship of accelerated corrosion.Methods The reliability model of accelerated corrosion relationship based on corrosion current was proposed.The corrosion current of LY12 and ZL115 aluminum alloy materials in distilled water and NaCl solution with different concentration were obtained by means of polarization curve test.Results The corrosion current of random aluminum alloy with defect distribution was random and increased with the increase of salt.The accelerated corrosion relationship coefficient of the two kinds of aluminum alloy materials was statistically different.Accelerated corrosion relationship coefficient of LY12 aluminum alloy with 95% confidence under 3.5% salt concentration (temperature) was 3.53,ZL115=2.32 respectively.Conclusion The study of accelerated corrosion relationship based on corrosion current in this paper can provide a basis for determining the calendar life of aircraft.