Macromechanical model for predicting the susceptibility to acid corrosion and hydrogen embrittlement of austenitic thin sheet metals and foils manufactured by complex forming technologies

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Despite the fact that the microstructure influences the corrosion behavior, corrosion rates can only be predicted in few cases and are insufficiently accessible by macromechanic FEM simulations according to the state of the art. In the previous DFG project AW 6/27-1/LA 1274/27-1, qualitative and quantitative correlations were found between microstructure and surface-corrosion rate for the materials DC04 and Al99.5. These correlations were implemented into a macromechanical FEM simulation. Based on these findings, the present project aims for expanding the applicability of the model with regards to (a) a more complex material (steel 316L), (b) hydrogen embrittlement, and (c) the complex, multiaxial forming process of deep drawing of thin metal foils (thickness < 0.5 mm). For this, new mathematically and physically based concepts as well as numerical approaches will be derived and implemented into the FEM. Hence, for the first time, the corrosion rate of the material 316L and its susceptibility to hydrogen embrittlement will be predictable in dependency of the microstructural condition that has been influenced by forming. As a result, in bipolar plates produced from 316L, numeric calculations of the optimum microstructure and processing route will be possible. Thus, an improved corrosion resistance will be achieved for the application in fuel cells and a long service life with high efficiency will be assured.