Numerical Simulation of Gas-Particle Two Phase Flow in the Process of Cold Spraying Aluminum Zinc-Base Alloy Powder

Abstract

The gas velocity and particle velocity in and out of the nozzle have great influence on the coating effect in the process of cold spray. An axis-symmetric two-dimensional mathematical model was presented to study the flow field in and out of cold spray nozzle, and the effect of different pressure, temperature, spraying distance and particle diameter on gas axial velocity and particle velocity were researched. The simulation results showed that the gas axial velocity and particle velocity increased when the gas pressure and temperature were increased, spray distance had little effect on the flow field in the nozzle, and small diameter particle was more easily accelerated.

Investigation on the Cathodic Protection Effect of Low Pressure Cold Sprayed AlZn Coating in Seawater via Numerical Simulation

“…The residual corrosion rate of Q235 steel can be written as Equation (11) [23]. (11) In which i c is the corrosion current density of metal under a controlled potential η c . i corr is the corrosion current of metal under open circuit potential, which can be obtained by Tafel extrapolation from Figure 6.…”

“…Cold spray methods can deposit a composite coating simply by spraying mechanically-mixed Al and Zn powders, which can simplify the coating deposition process significantly. In addition to its high cohesion strength, low porosity, and low oxidation, cold spraying methods have attracted great attention in the corrosion field; the research results also indicate that cold-sprayed coatings have advantages in anticorrosion [11][12][13]. There have already been numerous simulation studies (BEM, boundary element method) on the corrosion behaviors of thermal-sprayed AlZn coating in atmosphere environment simulation studies (BEM, boundary element method) on the corrosion behaviors of thermal-sprayed AlZn coating in atmosphere environment for thermal-sprayed AlZn coating [14].…”