Recently, some Tesla Cybertruck owners reported that after the rain, orange rust spots appeared on the stainless steel body of this pure electric pickup truck, which looked very ugly. In response, Wes Morrill, chief engineer of Cybertruck, director of engineering at Tesla, responded to Cybertruck: "Wipe it down(Wipe it off).
Looking at the entire automotive industry, apart from the Cybertruck, it seems that there is no second production car that uses a stainless steel body to be directly exposed. It may be said that the Delorean DMC-12 in the film "Back to the Future" also had a stainless steel body, but only 9,000 units were produced in the three years of 1981-1983. There are very few of them in existence, so it is rarely seen on the streets. 
Therefore, the Cybertruck can be said to be the only new car with a stainless steel body still in production, and this model that can be "bulletproof" in the mouth of Tesla CEO Elon Musk does not seem to be enough in terms of "waterproof" performance. On the Cybertruck Owners Club forum, a user named Raxar mentioned that his Cybertruck had orange rust after driving it in the rain in California for two days. 
The netizen also specifically mentioned that when picking up the car, the sales consultant said that the Cybertruck had orange rust marks after the rain and the vehicle needed to be polished. But I didn't take it to heart at the time, and I didn't realize the seriousness of the problem until the orange rust spots appeared. 
For the surface rust, Wes Morrill, chief engineer of Tesla's Cybertruck, gave a solution very "intimately". "Stainless steel is reactive, and the free iron on it rusts, but that's just a surface contamination and can be easily removed," says Wes Morrill. He also recommends using the "bar keeper."'S Friend" and "Citrisurf77" cleaners, and said that "the stain removal effect is very good". 
In fact, in theory, stainless steel is more corrosion-resistant than other steels. The stainless steel and corrosion resistance of stainless steel is due to the formation of a chromium-rich oxide film (passivation film) on its surface, which isolates the metal from the external medium, prevents the metal from being further corroded, and also has the ability to self-repair. 
It is understood that the Cybertruck uses a cold-rolled process stainless steel called Ultra-Hard 30X, which can be seen from the label 30X This material is a variant of 300 series stainless steel, but unlike all 300 series stainless steel on the market, the material used by Cybertruck is customized by SpaceX's material scientists, and only the outer skin of Cybertruck and SpaceX Starship uses this material. 
When the chromium content reaches a certain percentage, the corrosion resistance of steel undergoes a sudden change, that is, from easy rust to not easy to rust, from non-corrosion resistant to corrosion resistance. The chromium content is the fundamental factor that determines the properties of stainless steel. It is reported that the standards of Europe and the United States and other countries stipulate that the minimum chromium content shall not be less than 105%, Japan is 11%, and China is 12%. 
This also shows that stainless steel is not invulnerable, and it can still rust when humidity and temperature reach a certain level. Tesla also wrote in the vehicle manual the care precautions for the stainless steel body: "Avoid hot water and direct sunlight washing." "This is equivalent to admitting the fragility of stainless steel, and it also completely does not take into account the environment of the car owners, generally work vehicles such as pickup trucks, basically parked outdoors, not in the garage. Therefore, the owners of the Cybertruck should find a tarp and cover the car, which is indeed a bit "squeamish". 
Looking up the Cybertruck's warranty policy, it can be seen that Tesla's engineers seem to have expected the problem of rust for a long time. Therefore, it is stipulated in the warranty, the warranty coverage of body corrosion is: "rust perforation caused by defects in materials or workmanship", and the warranty duration mileage is: 12 years Unlimited mileage. The warranty mileage is very sincere, but "perforation" refers to the rust penetrating the panel to form a hole, how long can it be parked to perforate? This means that the surface rust currently experienced by users is not covered by the warranty. Netizens made the following picture interestingly to mock the rust problem of the Cybertruck. 
However, it is not without a solution, in addition to the frequent wipe, Tesla also provided the Cybertruck with polyurethane film for $5,000. The official description reads: "Wrap your Cybertruck in our high-quality satin clear paint film, this configuration is only officially available through Tesla". It can be seen that Tesla has the ability to achieve "both beautiful and rust-resistant", but it has turned this basic configuration on every car into an option.
During this time, the Cybertruck is touring various cities in China, and there is definitely no chance to take a car out for testing, and they are all parked in shopping malls, and they are wiped by special people, and they can't even leave fingerprints, let alone whether they will rust. I think that since the Cybertruck is a pickup truck and a work car, it is normal to have some rust on its body, it is nothing more than to buy a few more bottles of cleaning agent and wipe it frequently, and there is no need to spend an extra $5,000 on a film. Besides, $5,000 can buy as many bottles of detergent as you want.
References: 1. Twittercom/cybertruck2、www.cybertruckownersclub.com3、www.the***cn