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Care of Stainless Steel
Waukesha Cherry-Burrell
Page 8
95-03080
12/2010
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 corro-
sion 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 repu-
table 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 con-
tact 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 discolor-
ation, deposits or pitting may occur under product deposits or
under gaskets. Keep surfaces clean, including those under gas-
kets or in grooves or tight corners. Clean immediately after use.
Do not allow equipment to set idle, exposed to air with accumu-
lated foreign material on the surface. Corrosion pitting may occur
when stray electrical currents come in contact with moist stain-
less steel. Ensure all electrical devices connected to the equip-
ment are correctly grounded.
Elastomer Seal
Replacement Following
Passivation
Passivation chemicals can damage product contact areas of
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.
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