||Cavitation attack in liquids generate various states of stresses in surface layers of metals. Differences in stress state effects the hydrogen absorption activated by the cavitation implosion. Results of an XRD investigation and FEM modeling show the inhomogenity of the process.
Models of positive charge distribution under cavitation and an analysis of stress states show that at the microscopic level the edge areas of a cavitation microjet become particularly susceptible to the impact of hydrogen. These areas feature concentrations of hydrogen in the form of ions H+ ( H3O+ ) and tensile stresses. The process of adsorption and diffusion of hydrogen runs nonhomogeneously, where the main determinant is the probability of implosion of a bubble with boundary energy within a given surface microarea. At the macroscopic level the deciding factor is a change in hydrogen concentration close to the crack bottom.