The corrosion product of which metal consists of a roughened surface with a red, brown, or black stain?

The corrosion product that is characterized by a roughened surface and presents a red, brown, or black stain is primarily associated with iron. When iron corrodes, especially in the presence of moisture and oxygen, it forms iron oxides, commonly known as rust. This process results in the formation of a distinct surface that can exhibit these colors, which correspond to different forms of iron oxide, such as Fe2O3 (red rust) or Fe3O4 (black rust).

Corrosion-resistant steels, often referred to as stainless steels, have alloying elements like chromium that help prevent corrosion. Although they can corrode under certain conditions, the corrosion products typically do not create a roughened surface or the same coloration pattern as iron rust. Instead, corrosion in these materials usually leads to a more uniform film or discoloration without the rough surface characteristics that define iron corrosion. Hence, the correct answer is that the described corrosion products are primarily associated with iron.