rusty cog

air auto back background blue car chain cog cogs colors colours corode coroded coroding corosion crack cracked cracking cracks damage damaged damp deep defunct eaten eating grain grit ground iron link machine machinery macro metal moist motor neglect neglected oil old orange oxide oxides oxidise oxygen paint painted part parts patch patchy pattern red rot rott rotten rotting rust rusted rusting rusty sand shape sky sprocket sprockets steel strip stripped surface texture unused water wet wheel