Suppression of the surface roughness and fluctuation frequency by electric method

Qin, R. S. (2021). Suppression of the surface roughness and fluctuation frequency by electric method. Materials Today Communications, 28, article no. 102512.



The descriptions of materials surface geometry by noise theory and metrological method have been compared. An equation to reproduce the roughness and fluctuation frequency is suggested to model the surface. Numerical calculation shows that the surface area is dependent not only on the roughness but also the fluctuation behaviour. Using Boltzmann distribution to describe the forming possibility of various surface geometries enables to link possibility to system free energy. Through the numerical calculation of electric free energy, it is fount that electric field possess a significant retardation effect to the amplitude and frequency of surface fluctuation. The critical value of electric potential gradient to generate an electric effect to be comparable to surface energy is typically around 1 volt/cm, which is achievable in engineering practise. Further calculation shows that the critical values for various liquid iron surfaces are between 2.27 and 4.10 volts/cm and that for liquid aluminium are between 0.26 and 0.47 volts/cm. The reduced surface fluctuation curvature and surface area contribute to lubrication, corrosion resistance, crack initiation and wear resistance of materials.

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