When stainless steel corrodes, it does not rust all over like non stainless steel but acquires small localized pits or holes.
The majority of spoons and forks are made from stainless steels that have such excellent corrosion resistance that they are virtually immune to pitting. For knives, however, the blade steel is selected to give a compromise between corrosion resistance and cutting properties. In order to achieve a lasting edge, a steel that is much harder but of lower corrosion resistance that spoon and fork steel is used.
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As soon as the dishwasher has completed its cycle, remove the knives and wipe them dry. It is particularly undesirable to leave them overnight in the damp atmosphere of a dishwasher.
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Observe the dishwasher manufacturer?s instructions concerning the type and quality of detergent used and the method of loading cutlery in the compartments provided.
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Water with a high salt content is particularly corrosive to stainless steel. Dishwashers are often fitted with water softeners that must be regenerated with salt. After adding salt, make certain that the machine is put through the program recommended by the supplier before washing knives in the machine.