Finite element analysis method (that Ansys Mechanical solver or Autodyn solver or LS-DYNA solver uses) cannot simulate corrosion. If you can find another method/way to model the thinning of the parts due to being immersed in acid and get the final dimensions of your part, then you can simulate the effect of forces, pressures and other mechanical loads on this part in Ansys Mechanical.
Hope this helps.
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