Chapter 11 Surface Preparation Instrumentation

Question 1

1. Types of soluble salt contamination include:

Answer 1

Chlorides, Sulfates, Nitrates

Question 2

2. If inspection is to be effective with regards to soluble salts, the specification should very clearly state:

Answer 2

• Limits of soluble salts to be accepted
• Specific salts to be limited on the substrate
• Test method to use
• Frequency of testing
• Where to administer tests

Question 3

3. Test for soluble salts include:

Answer 3

• Potassium ferricyanide
• Bresle patch
• Sleeve test
• Soluble salt meters
• Conductivity

Question 4

4. Depth of surface profile can be evaluated by several methods:

Answer 4

ISO comparators
Replica tape
Digital profile gauge

Question 5

5. The ISO comparator grades may be recorded:

Answer 5

Finer-than-Fine
Fine
Medium
Coarse
Coarser-than-Coarse

Question 6

6. The two types of replica tape that are commonly used:

Answer 6

Coarse (20 to 64 um)
Extra Coarse (38 to 115 um)

Question 7

7. List the standards for using the replica tape:

Answer 7

NACE Standard SP0287
ASTM D 4417
Method C
ISO 8503-5

Question 8

8. When using replica tape common error include:

Answer 8

1. Inherent variation in point-to-point profile over the surface being measured.
2. Dirt particles on either the replica tape or gauge.
3. Gauge accuracy.
4. Rubbing technique. Either excessive or inadequate burnishing force.