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INTRODUCTION
It can produce a uniform and blue passive film on an acid or alkaline zinc coating. The stock solution does not contain hexavalent chromium, which meets the requirements of environmental protection.
Excellent corrosion resistance.
Suitable for both rack and barrel plating.
EQUIPMENT
Tank: steel tank with rubber lining or polyethylene/polypropylene, PVC/polyester. Do not set trivalent chromium passivation tank after the general passivation tank to prevent hexavalent chromium contamination.
Temperature control: required, PTFE heating tube and heat exchanger are recommended.
Agitation: uniform and mild air agitation.
Filtration: required.
Ventilation: required.
REPLENISHNMENT AND MAINTENANCE
New prepared solution | Operating control | |
RC-380H | 1.1 g/l | 0.9-1.3 g/l |
Impurity content of metal: Zinc Iron Copper Lead | - | <15 g/l <50 mg/l <5 ml/l <5 ml/l |
It meets the requirement of high anti-corrosion.
Copper and lead metal contamination should be avoided.
In general, the consumption of this product is 10-15 ml/m2.
Due to the higher drag-outs, the consumption should be increased to 20-30 ml/m2 for barrel plating.
MATTTERS NEEDING ATTENTION
It is recommended that 0.3% nitric acid should be used for bright dipping before workpiece passivation, then triple rinsing after passivation.
ANALYSIS OF TRIVALENT CHROMIUM
1. Pipette 5 ml sample into an Erlenmeyer flask.
2. Add 10 ml 5 mol/l sodium hydroxide.
3. Add 20 ml of hydrogen peroxide, then add anti-bumping granules and the Erlenmeyer flask needs to be covered by the filter funnel.
4. Heat to boiling then keep it for 30 minutes, hydrogen must be completely removed.
5. Cool the solution to room temperature.
6. Add 20 ml 2.5 mol/l sulphuric acid.
7. Add 1 g of potassium iodide and mix evenly. Put the solution in the dark for 3-5 minutes, and add a 1 ml starch solution.
8. Titration with 0.1 mol/l sodium thiosulfate standard solution until blue disappears end point.
Calculation: trivalent chromium content (g/l) = 0.1 mol/l sodium thiosulfate titration ml x 0.346
SAFETY AND ENVIRONMENTAL
A Material Safety Data Sheet (MSDS) includes product safety instructions and environmental protection instructions. Read and review the MSDS for appropriate health and safety warning before use.
WARRANTY
1. We provide guarantee for product quality under the valid law.
2. The quality of the product after reprocessing or repackaging by customer is not included in the guarantee.
3. Please feel free to contact us if you have any questions or issues about the products, we are ready to answer at any time.
COLOR & PACKAGING
RC-380H is dark green liquid with plastic barrel packaging. The packaging specification is 25 kg/pcs.
?IMPORTANT NOTICE REGARDING THIS INSTRUCTION BOOK
The product information and recommendations contained in this document are based on our experimental theory and data. Due to the particularity of the surface processing, further as the actual use of our products by others is beyond our control, NO GUARANTEE of any kind is made as to the effects of such use, and NO RESPONSIBLE for any consequences. Also, all the information in this document cannot be used as evidence of copyright infringement.