Image analysis of atmospheric corrosion of field exposure high strength aluminium alloys |
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Authors: | Lei Tao Xiaoyun Zhang Feng Lu |
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Institution: | a School of Materials Science and Engineering, Tianjin University, Tianjin 300072, PR China b State Key Laboratory for Corrosion and Protection of Metals, The Chinese Academy of Sciences, Shenyang 110016, PR China c Institute of Aeronautical Materials, Beijing 100095, PR China |
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Abstract: | The corrosion morphology image acquisition system which can be used in the field was established. In Beijing atmospheric corrosion exposure station, the image acquisition system was used to capture the early stage corrosion morphology of five types of high strength aluminium alloy specimens. After the denoise treatment, wavelet-based image analysis method was applied to decompose the improved images and energies of sub-images were extracted as character information. Based on the variation of image energy values, the corrosion degree of aluminium alloy specimens was qualitatively and quantitatively analyzed. The conclusion was basically identical with the result based on the corrosion weight loss. This method is supposed to be effective to analysis and quantify the corrosion damage from image of field exposure aluminium alloy specimens. |
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Keywords: | Atmospheric corrosion Aluminium alloys Corrosion morphology Image analysis Field exposure |
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