Waukesha Cherry-Burrell Care of Stainless Steel
10/2010 95-03009 Page 7
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
a
tta
ck. 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
de
po
sits 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
wh
en 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.
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