Posting on the Cybertruck Owners Club forum, a user named Raxar risked the wrath of the Tesla faithful—already exercised by the Cybertruck's numerous alleged design flaws—by stating that when they collected the $61,000 truck, 'the advisor specifically mentioned the Cybertrucks develop orange rust marks in the rain.' In a separate thread, the user vertigo3pc reported that 'corrosion was forming on the metal' of his Cybertruck after it spent 11 days in the rain in Los Angeles.
There are five basic families of 'stainless steel': austenitic, ferritic, martensitic, duplex, and precipitation hardened. Some containing chromium among other constituents, such as nickel and molybdenum, are more corrosion-resistant than others, forming an impervious and protective molecular-scale surface barrier of chromium oxide. Stainless steel discoloration usually takes the form of small, dark brown pits on the steel's surface.