Jeg fandt lidt om problemer med vandindtrængen i SKFs vedligeholdelsesbog på nettet.
Corrosion is another problem that occurs as a result of an ineffective sealing arrangement, mostly at standstill.
Water, acid, and many cleaning agents de- teriorate lubricants, resulting in corrosion.
When water, acid or cleaning agents enter an application, it negatively affects the ability of the lubricant to protect steel surfaces from oxidation. As a result, when a machine is at
a standstill, deep-seated rust forms easily.
Over time, the excessive moisture will form an acid in the lubricant and etch the surface black, as shown in fig. 54.
In the presence of water and due to capillary action, the area next to the rolling element contact zone might become corroded
(† fig. 55). This corrosion appears as greyish black streaks across the raceways, which usu- ally coincide with the distance between the rolling elements († fig. 56).
Fig. 54
Moisture acids in a spherical roller bearing
ISO classification: Moisture corrosion
Due to capillary action, the area next to the rolling element contact zone might become corroded.
ISO classification: Moisture corrosion
Fig. 55

Kilde
http://www.skf.com/files/895549.pdf