Detectable warning plate with patina

Stages of Rust

When oxidation occurs, the metal’s surface forms a scale that darkens to a patina. The alloy in question will determine if the corrosion is invasive or not. In cast iron, rust—a ferrous oxide—can form a thin, protective layer against pitting.

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A rough aluminum casting shows some shiny machined surfaces as well as metal and red plastic inserts and attachments

Secondary Processing

After a casting is done, cleaned, heat treated and tested, there may be secondary processing needed to finish it for its application. Read about machining, assembling, and finishes that happen in the foundry or off-site to finalize the casting for use.

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