Definition
Hollow steel tubing made from an alloy that contains chromium (and often nickel) so it strongly resists rust and chemical attack. In aircraft it is used in fluid lines and structural applications where exposure to moisture, fuel, oil, hydraulic fluid, or high temperatures would corrode ordinary steel.
Plain English
Steel tubing made with extra ingredients so it does not rust easily, used on the aircraft in places where regular steel would corrode.
Context Anchor
Seen in aircraft maintenance when inspecting, repairing, or replacing metal tubing in systems such as brakes, hydraulics, fuel, or engine-related lines.
Derivation
Corrosion comes from the Latin corrodere, meaning 'to gnaw away.' That captures what corrosion does to metal -- it eats it slowly. 'Corrosion resistant' simply means the steel is built to resist that gnawing.
Why Pilots Care
Using non-resistant tubing risks leaks, pressure loss, or system failure from corrosion in critical fluid lines.
Intuition Check
Corrosion resistant does not mean corrosion proof. It means the steel is much better at resisting rust and chemical damage, but it still needs proper inspection and care.
Example Sentence 1
The hydraulic line near the engine was replaced with corrosion resistant steel tubing because of the heat and fluid exposure in that area.
Example Sentence 2
Inspect all fuel lines for signs of damage and replace any sections with corrosion resistant steel tubing as required.