<p>In coal mining and conveying, coal slurry adheres to mechanical equipment for a long time, which causes structural corrosion, economic losses, and even safety accidents. To investigate the natural corrosion of common metals (#0 zinc, 1060 aluminum, AZ31B magnesium alloy, T2 pure copper, and 304 stainless steel) in coal slurries, static immersion tests were conducted at ambient temperature. The morphologies and chemical compositions of the metal surfaces after immersion were analyzed using scanning electron microscopy and X-ray energy dispersive spectroscopy. The results showed that the zinc and magnesium alloys generated a flaky structure and formed flower-like corrosion products, the aluminum corrosion products had a rice-like structure, the 304 stainless steel corrosion products had a block-like structure, and the pure copper corrosion products were agglomerated nanoparticles. The corrosion resistance, process, and mechanism of common metals in coal slurry filtrate were discussed to provide a research basis for protecting metals against corrosion.</p>