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This is what you'd get without those oxidation layers, which is a common problem in metalness workflows, and is the result of strictly sticking to 0 or 1 metal values. It's also wrong, which is why you should be using grey values in your metal maps.

Here it is side by side in the same image. Left is with oxides filling in grey values, and right is just a rust to steel transition without the intermediate steps.

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