基于数字处理技术的航空铝合金材料孔蚀率计算研究

通过航空LD2材料的加速腐蚀试验,获取该材料试件不同腐蚀周期的腐蚀形貌图像,对腐蚀形貌图像进行基于数字处理技术的一系列处理,最终通过二值特征提取方法得到二值化腐蚀图像,并依据二值化结果计算LD2材料不同腐蚀周期的孔蚀率。计算结果表明,此种方法得到的孔蚀率变化规律与该材料的电化学腐蚀机理较为吻合,并且该方法克服了传统方法计算孔蚀率精确性差的问题,为航空铝合金的孔蚀率计算及相关分析提供了新思路。

Research on Pit Corrosion Ratio Computation of Aero Aluminum Alloy Material Based on Digital Processing Technique

Accelerated corrosion tests were carried out on LD2 aluminum alloy and corrosion images of the specimen of different corrosion periods were obtained.A series of digital processing technics was applied to analyze the corrosion images and the binarization corrosion images were obtained by the binary characteristic extraction.The pit corrosion ratio of LD2 specimen was calculated based on the obtained binarization corrosion image.The computation results showed that the evolvement of LD2 specimen pit corrosion ratio was better coincidence with the electrochemistry corrosion mechanism of LD2,and the calculation precision of the analysis method is highly better than the traditional pit corrosion ratio calculation method.The purpose was to provide reference for pit corrosion ratio calculation and relative analysis.