What type of device is used to remove surface corrosion from a magnesium alloy?

• A. A steel wire wheel.
• B. A stiff hog-bristle brush.
• C. A copper wire brush.
• D. A standard nylon brush.

Answer: (B)

When cleaning magnesium alloy surfaces, you want an abrasive action that removes corrosion without introducing contaminating metals. Magnesium is reactive and can form galvanic cells if ferrous or copper particles get embedded on the surface, which accelerates corrosion. A steel wire wheel would be too harsh and can gouge the surface and leave steel particles behind. A copper wire brush can deposit copper on the surface, creating a potential galvanic site. A standard nylon brush may be too gentle for heavier corrosion deposits. A stiff hog-bristle brush strikes the right balance: its natural fibers provide enough abrasive action to lift surface corrosion without embedding metal or causing significant surface damage, making it the safest and most effective choice for this purpose.