Zinc
MAR TRIBLACK I PASSIVATE
The MAR TRIBLACK I PASSIVATE is a unique easy to use all trivalent black passivation coating that can be applied to electrodeposited barrel zinc/nickel. MAR TRIBLACK I PASSIVATE produces a comparable finish to hexavalent black conversion coatings when used in conjunction with newly developed sealer such as the MAR Tri Black Sealer TC-08B. This system complies with the European ELV directive and further environmental RoHS and WEEE directives. The finish further meets the RoHS requirements of China. The passivated coatings generated with MAR TRIBLACK I PASSIVATE are temperature stable up to 200°C, so all parts can be coated before treatment for hydrogen embitterment
The MAR TRIBLACK I PASSIVATE is two-part system with long bath life and easy control. When sealed properly, it will exceed 96 hours of 5% neutral salt spray before the appearance of white corrosion products. MAR TRIBLACK I PASSIVATE can be operated at ambient temperatures.
WARRANTY AND DISCLAIMER: This information is based on our experience and is, to the best of our knowledge, true and accurate. MAR-Tech Holdings Inc. gives no warranty, expressed or implied and the products are sold upon condition that the purchasers will make their own tests to determine the quality and suitability of the product. Any information or suggestions are given without warranty of any kind and the purchasers are solely responsible for any loss arising from the use of such information.
MAKE UP AND OPERATING PARAMETERS
BLACK PASSIVATION FOR BARREL ZINC/NICKEL
| MAKE UP: | 50 ml/litre of MAR BLUE 1 |
| 25 ml/litre of MAR BLACK 1 PART 2 (10 – 40 ml/litre) | |
| pH: | 1.8 - 2.2 |
| TEMPERATURE: | ≥ 20 oC |
| TIME: | 30 – 120 seconds |
SOLUTION MAKE UP
- Be sure the tank being used is leached of all hexavalent chromium products before charging.
- Fill tank to approximately 60% of final volume preferably with deionized water.
- Add the required amount of Sodium Nitrate
- Add the required amount of MAR BLUE 1.
- Add the required amount of MAR BLACK 1 PART 2.
- Bring tank to final working volume and check pH of the solution.
- To raise the pH, use dilute Sodium Hydroxide, and to lower the pH use Sulphuric Acid.
SOLUTION MAINTENACE
Routine additions via metering pump or regular "over the side" tank additions should be incorporated into the operating procedures. It is not wise to allow the solution to become almost depleted and "recharged" with large amounts of chemistry. Addition rate should be determined empirically through analysis of the passivation bath with a correlation of the amount of work going through the line. Typical replenishment rate of 1 litre MAR BLACK 1 PART 2 for every 100 – 150 square feet of work being processed should be used as a guide. Replenishment o of MAR BLUE 1 should be done by analysis. Part configuration and drag out should be taken into consideration when determining the exact add back rate.
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