Pre-treatment of the metal surface can improve corrosion resistance
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Before being exposed to the operating environment, metals are treated with passivators or film-forming agents, which result in the formation of a stable and dense passivation layer on their surface, thereby greatly enhancing their corrosion resistance. It differs from the corrosion inhibitor method in that no further addition of corrosion inhibitors is required in the subsequent usage environment. Aluminum, when subjected to anodic treatment, develops a film on its surface that is denser than one formed in atmospheric conditions; such films exhibit excellent corrosion resistance in mild corrosive environments. The blueing of steel surfaces is also based on this principle.
Yes. Pre-treating the metal surface (such as through passivation, film formation, or application of protective coatings) allows for the creation of a stable and dense passivation layer or oxide layer, which effectively prevents direct contact between corrosive agents and the metal substrate, thereby enhancing its corrosion resistance. This method is different from using corrosion inhibitors; no additional corrosion inhibitors need to be added in the actual operating environment after surface treatment. For example, aluminum alloys can have a denser protective oxide film formed on their surface through anodization, thereby enhancing their corrosion resistance ； The blueing treatment of steel surfaces works on a similar principle. .