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| RELATIVITY BETWEEN IMAGE GRAYSCALE AND CORROSION CHARACTERISTICS |
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| 中国石油大学 |
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Abstract The relationship between corrosion image grayscale and pit depth was studied based on experimental data. A good linear relationship was observed and their relatioship coefficient was high up to 0.95 for corrected image of isolated and regulation holes by double-direction scanning. For actual corrosion images, the relationship was still linear under confidence leel 0.95. however, the complex deep pits might cause error and corresponding image grayscale became higher in values(brighter). Moreover the correlation curve of statistical distribution between gray and pit depth showed two lines with different slopes, which turning point was 0.045cm. Therefore it could be decided that corrosion morphology diagnoses based on image grayscale were more suitable for early corrosion stages. Inaddition, the relationship between image grayscale and corrosion parameters was also investigated and the results showed that image grayscale range was good characterization for average corrosion rate and max. pit depth, that they had good linear relationship under confidence level 0.95.
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Received: 11 July 2005
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