A measuring method for B10 corrosion product film thickness and corrosion damage based on white light interferometer

Abstract

This paper proposes an accurate and high-throughput testing technique to characterize the film thickness of corrosion products and the corrosion surface damage. This method first selected the optimal instrument parameters and sample preparation methods. Secondly, three approaches were implemented to improve test accuracy: eliminating initial errors, optimizing post-processing processes, and excluding the impact of critical data. Finally, this technology is applied to evaluate the corrosion resistance of B10 pipes. The results in the range of 4 mm × 4 mm indicate that when the fluctuation range is −400 μm ∼ 100 μm and the magnification 20 × 1, the optimal combination of acquisition time and image quality could be achieved. After implementing three processing methods to improve accuracy, the difference between the measurement result and the conventional value is reduced to 0.03 μm, and the variance is reduced to 0.002. This method is verified to accurately characterize a corrosion height of approximately 0.2 µm.