Corrosion 2 Flashcards
What is a visual inspection?
The process of using the eye, either alone or with aids, to determine the condition of a unit under inspection.
What is the greatest Non Destructive Testing Tool?
Visual/eyes
What does liquid penetrant inspection reveal?
Surface-breaking cracks in solid, nonporous materials.
List the steps involved in liquid penetrant inspection.
- Pre-cleaning
- Application of the penetrant
- Removal of excess penetrant
- Application of developer
- Examination under appropriate light
- Post cleaning, if needed.
What are the major limitations of penetrant inspection?
- Detects only surface discontinuities
- Cannot detect subsurface defects
- Surface roughness or porosity can limit use.
What types of parts can penetrant inspection be used on?
Most airframe parts and assemblies accessible to its application.
What is the purpose of effective visual inspection?
To locate signs of corrosion, bulges, lifted surfaces, and defects.
What are the tools and aids used in conducting visual inspections?
- Flashlights
- Hands
- Magnifying inspection mirror
What is radiographic testing?
A non-destructive testing method using x-rays or gamma rays to examine the internal structure of manufactured components.
What is the purpose of evacuating the aircraft and surrounding area before radiographic inspection?
To avoid exposing maintenance personnel to the effects of ionizing radiation.
What does eddy current testing primarily detect?
Surface flaws in conductive materials.
How does eddy current testing work?
An alternating magnetic field induces a current in a conductor, generating a new magnetic field that is detected by a receiver coil.
What is the role of the developer in liquid penetrant inspection?
To pull the penetrant back out of a defect for visibility and to spread it around the defect.
What is ultrasonic inspection?
A method using high frequency sound energy to detect internal flaws or characterize materials.
How does ultrasonic testing generate high frequency ultrasonic energy?
By converting high voltage electric pulses through a transducer.
What is the definition of Non Destructive Testing (NDT)?
Any means of determining the strength and integrity of an object without destroying it.
What are some terms associated with Non Destructive Testing?
- Non Destructive Inspection
- Non Destructive Evaluation.
What can Effective Visual Inspection do?
- locate chipped, missing and
lifted paints which can lead
to the corrosion of the
metal underneath. - locate
dished and popped rivets evident
signs that the dissimilar metals
are affected by galvanic
corrosion. - locate
skin bulges or lifted surfaces evident
signs that intergranular corrosion
and exfoliation corrosion have
already started.
Non-Destructive Testing
Liquid Penetrant Inspection, also called Fluorescent penetrant testing
liquid penetrant inspection
used to reveal
surface-breaking cracks in solid, nonporous
materials
liquid penetrant
has the capacity
to enter the crevice’s opening on
the surface of a material
developer
effectively pull the penetrant back out of
a defect to allow it to be seen by an
inspector
Why it is important to clear a/c surrounding before radiographic testing?
to avoid effects of ionizing
radiation
Eddy Current testing
method of nondestructive testing mainly
used to detect surface flaws in conductive materials – ideal for the
relatively thin metal material found in aircraft
Eddy Current
*An alternating magnetic field induces a
current in a conductor
The Eddy Current generates a new superposed magnetic field. This field is detected by?
receiver coil
Used to measure the depth of corrosion
Depth Dial Gauge
Depth Dial Gauge
Measure the hole
