Abstract
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.
Highlights
Metal corrosion is harmful, causes problems in everyday life, and results in great economic loss.1–3 According to incomplete statistics, the annual economic loss caused by metal corrosion in China can be as high as 280 × 109 yuan, which is the sum of the losses caused by other natural disasters, such as floods and typhoons.4 At present, the corrosion protection of steel mainly uses coating protection and electrochemical protection.5–7 Coating protection methods have been widely used in engineering applications because of their low price, simple operation, low environmental pollution, high working efficiency, and wide range of applications.8–10The most common method of coating preparation is the brush method
To ensure the accuracy of the test results, the samples prepared were all of the maximum thickness that could be achieved with the process
The test results show that the thickness of the coating produced by the traditional electrostatic spraying equipment is only 112 ± 15 μm
Summary
Causes problems in everyday life, and results in great economic loss. According to incomplete statistics, the annual economic loss caused by metal corrosion in China can be as high as 280 × 109 yuan, which is the sum of the losses caused by other natural disasters, such as floods and typhoons. At present, the corrosion protection of steel mainly uses coating protection and electrochemical protection. Coating protection methods have been widely used in engineering applications because of their low price, simple operation, low environmental pollution, high working efficiency, and wide range of applications.. The electrostatic powder spraying method have greater porosity than those created by the traditional coating brush method. These coatings have a lower bonding strength than the coatings prepared by traditional electrostatic spraying and can peel off under the action of an external force. The modification of the sprayed powder by plasma can improve the thickness and bonding strength of the coating and reduce the porosity to effectively improve the protective performance and increase the service life of a coating
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