Abstract
Stainless steels applied to exterior walls and roofs of buildings even in coastal areas. These cases have been increasing lately.
In this study, atmospheric corrosion of stainless steels used for eaves of buildings and effects of environmental factors were investigated.
Results are as follows.
1) Stainless steels used for the eaves corroded more severely than those for the roof. The average pit depth of specimens on the eaves was deeper and the number of pits was larger than that of specimen on the roof. The steeper the eaves' angle, the more the stainless steel corroded.
2) The corrosion of the stainless steels on the eaves and the roof corresponded to the amount of chloride ion in atmospheric dust on the specimens. Atmospheric dust on the eaves was hardly washed away by the rain. Therefore, the accumulation of chloride ion on the eaves was much more than that on the roof. The humidity around the eaves was more favorable for atmospheric corrosion (RH 33 to 75%). It was though these two environmental factors (the accumulation of chloride ion, the favorable humidity) facilitated the atmospheric corrosion of stainless steels on the eaves.
