Preparation of epoxy coatings by plasma-electrostatic spraying

In this work, low-temperature plasma was introduced into the traditional electrostatic spraying process. The highly active groups in the plasma were used to increase the thickness and density of the electrostatic spray coating. The analysis of the properties of the coating shows that the introduction of oxygen, nitrogen, or air plasma can effectively increase the thickness, reduce the porosity, and improve the barrier property of the coating. Among the three kinds of plasma, the modification effect with oxygen plasma is the best. The thickness of the oxygen plasma-modified coating can reach 140 µm; the porosity is 0.75 dot/cm2; and the bonding strength is 2.59 ± 0.27 MPa.