The corrosion-resistant effect of polymer coatings on metals
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Protecting metal structures in the atmosphere with organic coatings is the most widespread method of corrosion prevention. The coating is applied to the metal surface and forms a porous film upon drying; although it cannot completely isolate the metal from the medium, it increases its value by reducing the corrosion current through the diffusion resistance of the micropores and the electrical resistance of the solution. In mild environments such as the atmosphere and seawater, the corrosion of metal at the micro-pores occurs slowly; the corrosion products can block these micro-pores, resulting in a long service life. However, this material is not suitable for highly corrosive solutions, as the metal corrodes more rapidly and hydrogen is generated, which can cause the paint coating to crack.
Polymer coatings play an important role in metal corrosion prevention. By forming a porous film on the metal surface, although the coating cannot completely prevent contact between the metal and the environment, it can significantly increase the diffusion resistance of corrosive agents, thereby reducing the corrosion current. In milder environments such as the atmosphere and seawater, the corrosion rate of the metal at the bottom of the micropores is slower, and the corrosion products can block these micropores, thereby extending the service life of the coating. However, in highly corrosive solutions, metal corrodes at a faster rate, and the generation of hydrogen can lead to the breakdown of the coating. .
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