Microradiographic detection of corrosion pitting

A microradiographic characterization of corrosion pitting in 2024-T3 aluminum alloy is reported. Using projection magnification the radiographic parameters were optimized to reduce system unsharpness. Contrast sensitivity of less than 2 percent and pit size detection of less than 10 {micro}m (0.0004 in.) were achieved using the microradiographic system developed. Reduction of scattered radiation and improvement of signal-to-noise ratio and contrast are additional advantages of the use of projection magnification in microradiography. The microradiographic images of corrosion were further optically magnified to enhance detectability. Comparison of images taken by micro and conventional radiography shows significant advantages in the microradiographic method. Using samples with artificial pits calibration curves were established for corrosion-pitting depth determination in aluminum.