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To prevent rusting of cast iron guardrails, the following measures can be taken:

??? 1. Protect the surface of the iron product from crystallization and drying;

??? 2. Cover the steel surface with protective layer (such as painting, anti-rust oil, burning, plating, baking blue, etc.);

??? 3, in the change of the internal structure of iron, the title synthesis just.

3.博洛尼亚大学,城市
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