Issues to consider in the design of corrosion-resistant coatings

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When designing a coating, it is first necessary to understand the operating conditions of the workpiece as well as the properties that its surface should possess. It is important to accurately identify the factors that can lead to the failure of the workpiece, such as the medium in which it operates, the temperature, the nature and magnitude of the forces acting on it, as well as the material, structure, and dimensions of the workpiece. Based on this information, the requirements for the coating can be determined, including aspects such as adhesion strength, hardness, thickness, the amount and size of pores, surface precision, wear resistance, corrosion resistance, heat resistance, and other properties. The selection of corrosion-resistant coating materials is quite complex. The operating condition of the parts, operating temperature, operating environment, and various corrosive agents all increase the requirements for coating materials. Corrosive environments can be aqueous solutions, gases, or various chemical media, and may also have a wide range of temperatures. In the presence of gas, the burning gases or unburned fuel can also react with other substances at appropriate temperatures, creating a very complex corrosion environment.