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The aim of this paper is to investigate the growth of pitting corrosion in CUSTOM 450 stainless steel and to obtain strain values in growing pits at the maximum bending region. In this regard, a two-point bending specimen was made and subjected to a potentiostatic test under the potential of 350 mV_SCE in the 3.5 wt% sodium chloride solution. Then, the depth of the grown pits is calculated using Eddy Current device. By simulating a sample under the pitting corrosion in COMSOL Multiphysics software and matching its results with the results of the Eddy Current device, it was found that the simulation can largely replace the laboratory test. To calculate the tensile stress distribution in the cross section of the sample under pitting corrosion, the Laplace equation governing the sample was discretized. The same results were obtained by solving the discrete equations and comparing them with the results of COMSOL Multiphysics software. According to the results, the pit tends to grow superficially. This means that the surface growth of the pit is greater than its growth in the direction of depth. This is due to the fact that near the sample surface, tensile stress and electrical potential are high, as well as chemical reactions and corrosion in areas near to the pit surface.

Keywords: Pitting Corrosion, CUSTOM 450 Alloy, Stress Distribution, Boundary Element Method, Vompressor Blade

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