Hartzell HC-B3-2 Series Owner's Manual And Logbook page 50

Term
Corrosion (Steel)
Corrosion Product
(Aluminum)
Propeller Owner's Manual
Typically, an electrochemical process
that requires the simultaneous presence
of iron (component of steel), moisture
and oxygen. The iron is the reducing
agent (gives up electrons) while the
oxygen is the oxidizing agent (gains
electrons). Iron or an iron alloy such
as steel is oxidized in the presence of
moisture and oxygen to produce rust.
Corrosion is accelerated in the presence
of salty water or acid rain. Part failure
can occur from corrosion due to loss of
structural steel converted to corrosion
product, pitting, a rough etched surface
finish and other strength reduction
damage caused by corrosion.
A white or dull gray powdery material
that has an increased volume
appearance (compared to non-corroded
aluminum). Corrosion product is not
to be confused with damage left in the
base aluminum such as pits, worm
holes, and etched surface finish.
INTRODUCTION
139
Definition
61-00-39
Rev. 17 Apr/20
Page 1-20