Corrosion 1 Flashcards
Magnesium
highly susceptible to corrosion.
Corrosion appears as white spots
Susceptible to pitting corrosion.
HAE (Harry A. Evangelides) Anodized Coating
coating applied to magnesium
DOW 17 Magnesium Anodized Coating
corrosion-resistant coating to all magnesium components.
green or dark green finish.
Steel
red rust
Stainless steel
dark corrosion
Aluminum Alloys
Anodized or conversion coatings
White-to-gray powder.
Ion Vapor Deposition (IVD)
depositing pure aluminum to prevent corrosion
Titanium
Highly corrosion-resistant.
Cadmium
sacrificial plating to protect steel.
White powdery deposit to brown/black mottling.
used on landing gear
Nickel Alloy
Corrosion-resistant but prone to surface pitting in stagnant seawater.
Green powdery deposit.
Copper-based Brass & Bronze
Blue or blue-green powdery deposit.
common corrosion location in aircrafts
- Engine Exhaust Area
- Battery Compartments & Vent Openings
- Lavatories & Food Service Areas
- Wheel Well & Landing Gear
- External Skin Areas
- Water Entrapment Areas
- Engine Frontal Areas & Cooling Air Vents
- Control Cables
- Electronic Equipment
engine exhaust area
High temperature and corrosive exhaust gases accelerate corrosion.
Commonly affected areas: Gaps, seams, hinges, fairings.
Battery Compartments & Vent Openings
Acid fumes from overheated electrolyte cause rapid corrosion.
Requires regular cleaning and neutralization of acid deposits.
Lavatories & Food Service Areas
Organic waste and food debris hold moisture, leading to corrosion.
Areas behind galleys and lavatories need extra attention.
Wheel Well & Landing Gear
Subjected to debris, winter chemicals, and abrasion.
Protective lubricants and coatings may wear off.
External Skin Areas
Corrosion often starts at seams and lap joints.
Water and cleaning solvents may get trapped in lap joints.
Water Entrapment Areas
Moisture collection can lead to corrosion.
Drainage holes should be checked regularly.
Engine Frontal Areas & Cooling Air Vents
Continuous exposure to air and contaminants increases corrosion risks.
Control Cables
Carbon and stainless steel cables can corrode, especially in bare spots.
Requires cleaning, inspection, and preservative application.
Electronic Equipment
Copper, lead, and tin in wiring and circuit boards are prone to corrosion.
Protected by transparent films to block oxygen and moisture.
Corrosion is most common in
high-moisture
high-temperature
enclosed areas.
