Magnetic stainless steel sheets. What are the reasons

Magnetic stainless steel sheets materials appear rusting phenomenon, there may be several reasons: there are 1 magnetic stainless steel sheets  ion environment. Chloride ions exist widely, such as salt, sweat, sea water, sea breeze, soil etc.. Magnetic stainless steel sheets in the presence of chloride ions in the environment, corrosion is very fast, even more than ordinary low carbon steel. So the use of stainless steel environmental requirements, but also need regular cleaning, remove dirt, keep clean and dry. (so you can give him a "improper use".) One example: the Stainless steel sheet metal  of an enterprise with an oak container containing a chlorine ion, the container has been used for hundreds of years, the last century ninety's plans to replace, because the oak not enough modern, the leakage due to corrosion of stainless steel container for 16 days after replacement.