SERVICE MANUAL & ICA
8750 AMPHIBIAN/SEAPLANE FLOATS ON CESSNA 208/208B
Revision IR
Page 25 of 104
P/N 1005723 Doc. No. W8750-24-01
1.3 CORROSION
Corrosion is the process by which metals are
turned into oxides. It is a natural and ultimately
unavoidable chemical reaction that is
accelerated by dissimilar metals in contact with
each other, and enclosed spaces and
contaminants like dirt and exhaust deposits that
hold moisture against the metal. If that moisture
is salt water or fresh water that is polluted, it
conducts the electrolytes better and the process
of corroding is faster.
Most aircraft and most floats are made out of
aluminum due to its strength to weight ratio, and
its ability to withstand fatigue and remain field
repairable.
Steel is used for strength in hardware and
landing gear parts, and these are often areas
where these dissimilar metals cause corrosion.
Areas where moisture and dirt mix and stay wet
against metal are common sites of oxidation.
Float strut attach points, water rudders, and skin
joints are examples of areas where this occurs.
CORROSION HOT SPOTS
-
DISSIMILAR METAL CONTACT
LIKE LANDING GEAR, FLAOT
ATTACH POINTS AND OTHERS.
- ENCLOSED SPACES THAT STAY
MOIST LIKE LANDING GEAR
FLAOT INTERIORS, SKIN LAP-
JOINTS, AND OTHERS.
- CONTAMANINATES ON THE
METAL LIKE DIRT, SALT, ENGINE
EXHAUST AND OLD OR
OTHERWISE COMPRISED GREASE