Care of Stainless Steel
Waukesha Cherry-Burrell
Page 6
95-03057
11/2012
Care of Stainless Steel
Stainless Steel Corrosion
Corrosion resistance is greatest when a layer of oxide film is
formed on the surface of stainless steel. If film is disturbed or
destroyed, stainless steel becomes much less resistant to
corrosion and may rust, pit or crack.
Corrosion pitting, rusting and stress cracks may occur due to
chemical attack. Use only cleaning chemicals specified by a
reputable chemical manufacturer for use with 300 series stainless
steel. Do not use excessive concentrations, temperatures or
exposure times. Avoid contact with highly corrosive acids such as
hydrofluoric, hydrochloric or sulfuric. Also avoid prolonged
contact with chloride-containing chemicals, especially in
presence of acid. If chlorine-based sanitizers are used, such as
sodium hypochlorite (bleach), do not exceed concentrations of
150 ppm available chlorine, do not exceed contact time of 20
minutes, and do not exceed temperatures of 104°F (40°C).
Corrosion discoloration, deposits or pitting may occur under
product deposits or under gaskets. Keep surfaces clean,
including those under gaskets or in grooves or tight corners.
Clean immediately after use. Do not allow equipment to set idle,
exposed to air with accumulated foreign material on the surface.
Corrosion pitting may occur when stray electrical currents come
in contact with moist stainless steel. Ensure all electrical devices
connected to the equipment are correctly grounded.
Elastomer Seal
Replacement Following
Passivation
Passivation chemicals can damage product contact areas of
WCB equipment. Elastomers (rubber components) are most
likely to be affected. Always inspect all elastomer seals after
passivation is completed. Replace any seals showing signs of
chemical attack. Indications may include swelling, cracks, loss of
elasticity or any other noticeable changes when compared with
new components.
