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INTRODUCTION
Simple operation. Utilizes the easily controlled soluble mixed catalyst.
It has high cathode current efficiency, and can be operated at high current density.
The workpiece can be well activated and a has wide bright range.
Good tolerance to impurities.
Excellent covering power and throwing power.
EQUIPMENT
Tank: hard PVC or steel tank lined with soft PVC.
Rectifier: requires enough amperage loads lie on tanks, ripple ratio 5%, and voltage is greater than 15V.
Anode: lead-tin alloy (tin 4-7%) or lead-antimony alloy, the ratio of cathode and anode is 1:2-3.
Heat system: titanium, lead or polytetrafluoroethylene.
Cooling pipe: titanium or lead.
ROLE OF THE COMPOSITIONS
Chromic acid: the necessary composition of bath. When the concentration of chromic acid increases, the conductivity of the solution increases and the cathode current efficiency decreases. When chromium content is insufficient, the workpiece is easy to burn in high current area.
Sulfuric acid: the solution must contain a certain amount of sulfate to reduce hexavalent chromium to metallic chromium. The ratio of chromic acid and sulfuric acid should be controlled at 200:1. If the proportion is too high (insufficient sulfuric acid), the deposit rate and gloss of the coating will be reduced, as well as the coating will appear black stripes and brown chrome stains. On the contrary, if the proportion is too low (overmuch sulfuric acid), although the brightness of the coating is slightly improved, the cathodic current efficiency, deposition speed and depth power are reduced. If the sulfuric acid content of the bath is too high, excessive sulfuric acid can be precipitated by barium carbonate, and 1 g of sulfuric acid can be deposited per 2 g of barium carbonate.
Trivalent chromium: trivalent chromium will be gained after electrolysis of the new plating solution, its content is generally 0.5-2 g/l. Too low of the trivalent chromium will lead to slow deposition rate, soft coating and poor plating power. When the trivalent chromium is too high, the bright range of the coating decreases, also the solution’s conductivity. The concentration of trivalent chromium is affected by the proportion of cathode and anode area. The electrolysis of small cathode area and large anode area reduces excessive trivalent chromium; on the contrary, the content of trivalent chromium can be increased. Normally, the anode area and cathode area are 1.5:1 to 1:1.
REPLENISHMENT OF THE ADDTIVES
RC-842 make-up is added while make-up and switch, consumed due to the process of electroplating and drag-outs. When the content is insufficient, the bright range becomes narrow, and the covering power decreases, which can be replenished with a small amount according to the situation. Usually, only RC-842 replenishment is needed, add 4-5 l of RC-842 for per 100 kg chromic anhydride.
SAFETY & ENVIRONMENTAL PROTECTION
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
Make-up (RC-842) is a brown-red liquid with plastic barrel packaging. The packaging specification is 25 kg/pcs.
Replenishment (RC-843) is a brown-red 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.