Practical Test Questions Flashcards
Tooke gauge non universal, what is the standard used
ASTM 4138 - measurement of dry film thickness of protective coating systems by destructive means (method A)
Took gauge measurements range(s) for 1x
1 mil reticle and 20-100 mils max range
Took gauge measurements range(s) for 2x
.5mil reticle and 3-20mil max range
Tooke gauge measurements range(s) for 10x
0.1mil reticle and 0-3mils max range
what dft gauge can be used for non metal coatings and substrate
UT-DFT gauge
What standard is used for UT-DFT gauge?
ASTM D6132 - standard test method for nondestructive measurement of dry film thickness of applied organic coatings using an ultrasonic gauge
What is the standard method for Pull-off Adhesion testing
ASTM D 4541 - standard Test method for pull off strength of coatings using portable adhesion testers
Adhesion testing- what does cohesion failure mean?
Failure within a coating layer (the one coating itself failed) a,b,c,d, etc
Adhesion testing- what does adhesion failure mean?
by the interfaces at which they occur, A/B, B/C, C/D, etc (whole coat fail to another or substrate
Adhesion testing- max allotted time for continuous pressure?
100 seconds
What is eddy-current DFT gauge used for
Non-ferrous metals- Aluminum, copper, Brass, and stainless steel.
What standard is used for eddy-current DFT gauges?
SSPC-PA 2
What standard should be used for barcol impressor?
ASTM D 2583, standard test method for indentation hardness or rigid plastic by means of barcol impressor
What does a test with barcol impressor tell you
Indication of cure
How to field verify calibration of barcol impressor?
Hard and soft alloy disks and glass disk given reading of 100.
When using the barcoll impressor what phenomenon occurs
Cold flow, creep. Take reading before it occurs
What is considered alkaline pH?
7.0 - 14.0 pH
What is considered acidic pH?
0.0 - 7.0 pH
What is considered neutral PH?
7.0 pH
What is LP WC?
5,000 PSIG - power-washing (low-pressure water cleaning)
What is HP WC?
5,000-10,000 PSIG - high pressure water cleaning
What is HP WJ?
10,000 - 30,000 PSI ( high-pressure water jetting)
What is UHP WJ?
Above 30,000 PSIG ( ultrahigh-waterjetting)
What is nace WJ1
Clean to bare substrate, matte finish. free of all visible everything
What is Nace WJ-2?
Very thorough cleaning - staining and tightly adherent material shall be limited to no more than 5% of each unit area surface
What is Nace WJ-3?
Thorough cleaning - staining or tightly adherent matters shall be limited to 33%
What is Nace WJ-4?
Light cleaning - residual material shall be tightly adherent to the metal substrate
