Hartzell HC-E4 3 Series - Page 47

Propeller Owner’s Manual
147
INTRODUCTION
61-00-47
Page 1-21
Rev. 16 May/20
Term Denition
Corrosion Product
(Aluminum)
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nish.
Corrosion Product
(Steel)
When iron or an iron alloy such as steel
corrodes, a corrosion product known as
rust is formed. Rust is an iron oxide which
is reddish in appearance and occupies
approximately six times the volume of
theoriginalmaterial.Rustisakeyand
crumbly and has no structural integrity. Rust
is permeable to air and water, therefore
the interior metallic iron (steel) beneath a
rust layer continues to corrode. Corrosion
product is not to be confused with damage
left in the base steel such as pits and etched
surfacenish.
Crack Irregularly shaped separation within a
material, sometimes visible as a narrow
opening at the surface
Debond Separation of two materials that were
originally bonded together in a separate
operation
Defect An imperfection that affects safety or utility
Delamination Internal separation of the layers of
composite material
Dent Thepermanentdeectionofthecross
section that is visible on both sides with no
visible change in cross sectional thickness