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Zinc Trivalent Chromate Sealer Salt Spray Test - Technical Update
Salt Spray Test Background
Five hundred pieces of customer hardware were barrel plated and chromated in Saporito Finishings high-corrosion resistant chromate. Two sample sets were submitted for zinc trivalent salt spray testing based on ASTM B117-95, 5% neutral Salt Spray Test.
Following barrel plating on all 500 parts, 50 pieces were subjected to a subsequent treatment in a chromate sealer that enhances the corrosion resistance of the chromate.
Two sets were prepared:
- Five customer parts processed through the barrel process and trivalent chromate.
- Five blanks taken from the processed parts and sealed
Salt Spray Testing Procedure
The parts were placed in the salt spray chamber / cabinet, supported by polypropylene rods and cable ties.
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SET 1
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96 Hours |
120 Hours |
144 Hours |
168 Hours |
240 Hours |
| PART 1 |
1=5% WC* |
1=5-10% WC |
1=10-15% WC |
No Change From
144 Hours |
1=15-20% WC |
| PART 2 |
1=1% WC |
1=1-3% WC |
1=5-10% WC |
1=10-15% WC |
| PART 3 |
N/C** |
1=1% WC |
1= 1-3% WC |
2= 5-10% WC |
| PART 4 |
N/C |
N/C |
2= 1% WC |
N/C |
| PART 5 |
N/C |
N/C |
N/C |
N/C |
% = Percent of surface part that is corroded
*WC = White corrosion
** N/C = No corrosion
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SET 2 (SEALED)
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96 Hours |
120 Hours |
144 Hours |
168 Hours |
240 Hours |
| PART 1 |
NC** |
1=1% WC |
1=1% WC |
No Change From
144 Hours |
2=1-3% WC |
| PART 2 |
N/C |
N/C |
N/C |
3=1% WC |
| PART 3 |
N/C |
N/C |
N/C |
N/C |
| PART 4 |
N/C |
N/C |
N/C |
N/C |
| PART 5 |
N/C |
N/C |
N/C |
N/C |
% = Percent of surface part that is corroded
*WC = White corrosion
** N/C = No corrosion
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Salt Spray Test Results
A set of the as plated and zinc Trivalent chromated parts were tested along with parts, which were zinc Trivalent chromated and sealed. Both sets met the 240-hour salt spray requirement; however, the Zinc Trivalent sealed parts performed better.
To receive more details about the benefits of zinc trivalent chromate sealer, please call 708-222-5317, or send us an e-mail , or submit the quick and easy form on the Contact Us page. |
