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Cause of hose corrosion
The metal reacts with oxygen in the atmosphere to form an oxide film on the surface. The iron oxide formed on the ordinary carbon steel continues to be oxidized, so that the rust is continuously enlarged, and finally a hole is formed. The carbon steel surface can be ensured by electroplating with paint or oxidation resistant metals (e.g., zinc, nickel, and chromium), but as is known, this protection is only a film. If the protective layer is destroyed, the underlying steel begins to rust.