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Adhesion
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Specimen #
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Deposit Thickness
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Fracture Area (mm2)
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Tensile Force (kg) |
Bond Strength (MPA) |
Comments
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1
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.001 - .002" |
461.86
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505 |
10.78 |
Epoxy
Failure at
Deposit
Interface
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2
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.0025 - .0035" |
481.00 |
1380 |
28.12 |
Epoxy
Failure |
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3
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.004 - .005" |
490.87 |
1487 |
29.70 |
Epoxy
Failure |
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Deposit Hardness - KNOOP - 100 gram load
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Substrate
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A1 2024-T4
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A1 6061-T6
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A1 7075-T651 |
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CeraFuse MCC-631
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1772 Kn100 |
1660 Kn100
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1509 Kn100 |
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Hard Anodize
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468 Kn100 |
493 Kn100 |
506 Kn100 |
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Electrical Resistance
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Substrate Alloy
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Deposit Thickness
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Deposit Condition
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Breakdown Voltage-DC |
Breakdown Voltage-AC |
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A1 2024-T6
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.001 - .0015" |
As Deposited
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500 - 800
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300 - 700
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A1 2024-T3
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.003 - .0035"
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As Deposited
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300 - 400
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520 - 650
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A1 6061-T6
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.001 - .0015"
.0025 - .003"
.0035 - .004"
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Impregnated - Hi Therm BC - 346A
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3000 - 3500
4200 - 4500
5500 - 7000
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None to 3000
None to 3000
None to 3000
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| Testing performed per ASTM-D-3755-86. Testing conducted at OMEGA Metal Laboratories. |
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Corrosion Resistance
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Specimen #
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Deposit
Thickness
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Hours in Test Until Initial Evidence of Corrosion
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Comments
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19
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.001 - .0015" |
1268
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Deposit surface polished before testing
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20
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.002 - .0025" |
1436 |
Deposit surface polished before testing |
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21
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.004 - .0045" |
1700 |
Deposit surface polished before testing |
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22
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.001 - .0015" |
None at 1700 |
Deposit surface polished and impregnated before testing |
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23
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.002 - .0025" |
None at 1700 |
Deposit surface polished and impregnated before testing |
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24
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.004 - .0045" |
None at 1700 |
Deposit surface polished and impregnated before testing |
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Corrosion testing per ASTM B-117. The initial duration of the test (per specification) was 336 hours. Since no evidence of corrosion was present at that point, the specimen was cleaned and the test continued with examination intervals of 24 hours. Substrate material is A1 6061 - T6. Testing conducted at OMEGA Metal Laboratories and QC Metallurgical Laboratories.
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Taber Abraser Test Data
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Sample I.D.
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Wear Index (10,000 Cycles)
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Wear Index (20,000 Cycles)
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Wear Index (30,000 Cycles) |
Wear Index (40,000 Cycles) |
Wear Index (50,000 Cycles)
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1-A
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9.49 mg |
4.49 mg
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2.38 mg |
1.95 mg |
1.70 mg
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2-A
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8.95 mg |
4.02 mg |
2.44 mg |
1.85 mg |
1.77 mg |
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3-L
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2.38 mg |
1.52 mg |
1.64 mg |
1.27 mg |
1.32 mg |
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4-L
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1.79 mg |
1.14 mg |
1.45 mg |
1.26 mg |
1.23 mg |
Testing performed per MIL-A8625F. Testing conducted at QC Metallurgical Laboratories. Substrate material is A1 6061-T6.
Wear Index calculated as follows:
WI (wear index)=(A-B)x 1000/C
A=Weight of specimen before abrasion cycle B=Weight of specimen after abrasion cycle C=Number of abrasion cycles recorded
Samples 1-A and 2-A were processed in the "as-deposited" condition. Samples 3-L and 4-L were finished to Ra 16-24 prior to testing.
Note that Taber Abraser test results on CeraFuse™ microarc oxidation deposits can be somewhat misleading if taken only at face value. It is apparent that the "layers" of the deposit, even though they appear homogenous, abrade at different rates during a Taber test. As might be expected, the outer or granular layer abrades very rapidly. As that layer is removed and the test apparatus contacts the more dense, functional layer, the deposit exhibits a marked reduction in weight loss per 1000 cycles. |
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