Why rust can appear on cutlery?
In principle, any steel can rust under certain conditions, but chromium and nickel in stainless steel essentially prevent the formation of rust on cutlery. Corrosion occurs mainly on knife blades, which are made of blade steel, and they have a lower chromium and nickel content but a higher hardness and better edge retention.
What kind of rust is occurs on cutlery?
Due to the high humidity, the iron dust in the dishwasher oxidizes and settles on your cutlery in the form of brownish stains. This iron dust is called flash rust, and one reason for stains can also be the additives necessary for cleaning. To prevent this, check whether your dishwasher is sufficiently supplied with rinse aid in addition to detergent.
Why does the cutlery have rust stains even though it is dishwasher-safe?
Rust can also settle on high-quality stainless steel cutlery, even though it does not rust. Flash rust forms during the rinsing process and happens, for example, on screws in lids or other non-stainless objects. Sometimes the coating of the dishwasher basket also comes loose and exposes rust particles, which are then found on the cutlery.