Corrosion Cleaning & Painting Flashcards
(18 cards)
(1)In the Corrosion process , it is the Cathodic area or dissimilar cathodic material that can corrodes.(2)In the Galvanic or Electro chemical Series for metals , the most anodic metals are those that will give up electron most easily .
Only 2 is true
Intergranular corrosion in aluminum alloy parts …..
cannot always be detected by the surface indications.
Which of the following are the desired effects of using Alodine(r) also known as Bonderite(r) on Aluminum alloy .
A slightly rough surface and increased corrosion resistance .
of the following ,when and where is galvanic corrosion most likely to occur ?
At the interface a steel fastener and aluminum alloy inspection plate in the presence of an electrolyte .
The rust or corrosion that occurs with the most metals is the result of …
a tendency for them to return to its natural state
Corrosion caused by galvanic action is the result of
contact between two unlike metals
For which of the the following reasons would a water break be conducted ?
To make certain that a bare metal surface is sufficiently coated .
A primary cause of inter granular corrosion is
Improper Heat Treatment
A non-electrolytic chemical treatment for aluminum alloys to increase corrosion resistance and paint bonding qualities is called
Alodizing
Which of the listed conditions is NOT one of the requirements for corrosion to occur ?
The presence of a oxide film
The caustic( reactive ) cleaning products used on aluminum structures have the effect of
corrosion
One way of obtaining increased resistance to stress corrosion cracking is by
creating compressive stresses (via shot peening ) on the metal surface .
The lifting or flaking of the metal at the surface due to delamination of the grain boundaries caused by the pressure of corrosion residual product build up is called
exfoliation
Galvanic corrosion is likely to be most rapid and severe when …
the surface area of the anodic metal is smaller than the surface area of the cathodic metal
A correct use for acetone is to
remove grease from fabric
When humidity
is low, what is likely to occur is hydrated wash primer is applied to unpainted aluminum and then , 30 to 40 mins later , a finish top coat is applied ?
A glossy blush-free finish
What is used to slow the drying time of some finishes and to prevent blush ?
Retarder
If registration numbers are to be applied with a letter height of 12 inches, what is the minimum space required for the registration mark N1683C?
Note:
2/3 xHeight= character width
1/6 x height = width for 1
1/4 x 2/3 height= spacing
1/6 x height= stroke or line width
52 inches
