Wet corrosion occurs in the presence of a liquid containing ions, an electrolyte. Problems with wet corrosion attacks in stainless steels occur in mineral acids, process solutions, seawater and other chloride containing media. Examples of wet corrosion forms are:

There are various corrosion phenomenon included in the above corrosion forms. For example, microbiologically influenced corrosion (MIC) and atmospheric corrosion in stainless steels are special cases of pitting and/or crevice corrosion. Selective corrosion is a special case of galvanic corrosion.