Avionics News June 2020 - 73

Table
1. The
effects
of corrosion
onequipment
avionics equipment
Table
1: The
effects
of corrosion
on avionics
Component
Antenna Systems
Chassis, housing, covers,
and mount frames.
Shock mounts and
supports
Control box mechanical
and electrical tuning
linkage and motor contacts
Water traps
Relays and switching
systems
Plugs, connectors, jacks,
and receptacles

Multi-pin cable connectors
Power cables
Display lamps and wing
lights
Wave guides
Fluid cooling system lines
Printed circuits and
microminiature circuits
Batteries
Busbars
Coaxial lines

Failure Mode
Short circuits or changes in circuit constants and structural
deterioration.
High VSWR, which causes poor reception and low transmitter power.
Contamination, pitting, loss of finish, and structural deterioration.
Deterioration and loss of shock damping effectiveness.
Intermittent operation and faulty frequency selection.
Structural deterioration.
If water is trapped at an antenna location, expect high VSWR, poor
reception, and low power output.
Mechanical failure, short circuits, intermittent operation, and signal
loss.
Short circuits, increasing resistance, intermittent operation, and
reduced system reliability.
Water can collect between a soldered-on connector and a circuit board.
Corrosion can follow the water path, causing an unwanted connection
between pins.
Short circuits, increasing resistance, intermittent operation, and
reduced system reliability.
Disintegration of insulation and wire/connector deterioration.
Intermittent operation, mechanical and electrical failures.
Loss of integrity against moisture, pitting, reduction of efficiency and
structural deterioration.
Reflection of radar energy strong enough to damage the radar R/T unit.
Failure of gaskets, pitting, and power loss.
Short circuits, increased resistance, component and system failures.
High resistance at terminals, failure of electrical contact points, and
structural deterioration of mounting. Erroneous cockpit signals.
Increased alternator or generator noise in the audio system.
Structural and electrical failures.
Impedance fluctuations, loss of signal, and structural deterioration of
connectors.
High VSWR, which causes poor reception and low transmitter power. In
severe cases, transmitter damage can occur.

process is reversed during a charge. When you see an old
car, the iron in the vehicle has turned into iron oxide, more
commonly called rust.
Direct chemical attack corrosion is a result of the
exposure of a bare metal surface to some type of caustic
liquid or gas. Common causes are battery acid spills,

battery fumes, residual flux deposits from welding or
soldering, and caustic cleaning solutions. Fortunately, the
items on this list are controllable through careful handling
and cleaning. Not so easy to control are the effects of
Continued on following page
avionics news

*

june

2020

73



Avionics News June 2020

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