Abstract:
Fundamental understanding of materials corrosion is drawing research interests since the degradation of materials from corrosion has been recognized in a wide range of applications. This talk focuses on the study of molten salt corrosion and anti-corrosion coating. Molten salt corrosion resulted from the selective dissolution of metal elements is a challenge for the development next-generation nuclear and solar power plants. It is important to understand the formation and propagation of pores from molten salt corrosion. This work proposed the kinetic mechanism of Ni-20Cr corrosion in molten KCl-MgCl2 via in situ synchrotron X-ray nano-tomography. By observing and quantifying the 3D morphological evolution, the dealloying (corrosion) of alloy was revealed to be determined by long-range-controlled diffusion. The formed porous materials underwent coarsening effect controlled by surface diffusion forming isolated pores and ligament pinch-off. Further studies on in situ synchrotron diffraction studies on Cr in molten salt identified the formation of new structure besides simply dissolution. In addition, environmentally friendly Zr-based chemical conversion coating is significant for corrosion prevention in automobile and aerospace applications. This work studied the effect of additives on the formation of the hybrid Zr-based conversion coating by a combination of electron and X-ray techniques. The organic additive played an important role controlling the morphology and chemical distribution of the coatings. The elemental and morphological change of the coatings in corrosive solution was studied by in situ synchrotron X-ray nano[1]tomography and fluorescence mapping. The works in this presentation broads the insights on the fundamental understanding of corrosion by applying in situ synchrotron X-ray characterization frameworks for developing corrosion mitigation methods.
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