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Waukesha Cherry-Burrell
Care of Stainless Steel
Stainless Steel
Corrosion
Elastomer Seal
Replacement
Following
Passivation
August 2008
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.
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.
95-03076
Care of Stainless Steel
Page 5
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