tech talk
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Disadvantages:
a. Corrosion protection for the housing is removed
b. The pin becomes a secondary wear surface due to the poor corrosion inhibitor
c. Less expensive manufacturing costs, but a higher total cost of ownership due to the need to eventually
replace the bushing, pin, and housing
1. There is no corrosion protection for the
housing.
• Corrosion will begin to form almost immediately
on the inner portion, where there is no bushing
material.This corrosion will flake off and begin
to prematurely wear both the bushing and pin
simultaneously.
• Corrosion will begin to form between the outer
diameter of the bushing and the inner diameter
of the housing, which will cause the housing to
shrink around the bushing. Doing this will reduce
the clearance between the bushing and pin, and
increase friction and the wear rate of the bushing.
2. The pin will deteriorate at higher rate due to
the absence of an effective corrosion inhibitor.
• Commonly used corrosion inhibitors, such
as zinc, nickel, and chrome, are very thin layers
applied to a pin and are quickly worn off during
normal operation.
• Once the inhibitor is removed, the base alloy
gets exposed to the environment and the surface
finish will become much rougher than any plain
bushing can successfully run on.
• This corrosion and degradation of the surface
finish may be unnoticeable during continuous
operation. However, once the machine is idle for
any length of time, the corrosion will be able to
expand rapidly, and in some instances, cause the
pivot to seize altogether.
By the removing grease used for lubrication, you have inadvertently introduced two critical issues that
will cause premature failure in an application:
Result of a housing without corrosion protection
Result of using a thin, ineffective corrosion inhibitor
on a shaft after only one season
