Black chrome plating additives

It can be directly plated on the bottom layer of stainless steel, copper, nickel, chromium and so on, with good binding force. The plating solution is stable, the formula is simple and the operation is convenient.

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Product Description

Black chrome plating additives

CR—3 black chromium additive


OneFeatures and uses

(1) It can be directly electroplated on the bottom layer of stainless steel, copper, nickel, chromium, etc., with good bonding force.      

(2) The plating solution is stable, the formula is simple, and the operation is convenient.      

TwoComposition and process conditions

Chromic anhydride

180-220 g/l

Sodium nitrate

3.5-4.5 g/l

CR—3 black chromium additive




Current density

10-50A/dm 2


2-5 minutes

ThreePreparation of plating solution

     1. Dissolve the calculated amount of chromic anhydride in an appropriate amount of distilled water, stir to dissolve it, and add 2-5 g/L of barium carbonate to remove the sulfate radical in the chromic anhydride. After the solution is clear, pour it into the plating tank.

     2. Dissolve sodium nitrate with distilled water, and pour the clear liquid into the tank.

     3. Add the CR-3 black chromium additive in formula amount.

     4. Finally, add distilled water to the specified volume, fully stir and electrolytic test plating.

Fourth, the role of plating solution components

     1. Chromic anhydride is the main component in the plating solution. When the content of chromic anhydride is low, the covering ability of the plating solution will be poor; when the content of chromic anhydride is too high, the hardness of the coating will decrease, generally controlled between 180-220 g/L.

     2. CR-3 black chromium additive can improve the dispersion ability of the plating solution and the blackness of the coating. If the content is too high, it will cause brittleness of the coating and shelling. During the production, the content of additives should be controlled within the process range, and the consumption is 300-400ml/KA·H.

     3. Sodium nitrate is a blackening agent in the plating solution. When its content is low, the coating is not black, and when its content is high, the dispersion and covering ability of the plating solution is poor.

Five, the maintenance points of the solution:

     1. When electroplating black chromium, due to the high current density used, the temperature of the bath is likely to rise during the electroplating process. When the temperature exceeds 40°C, the quality of the coating is poor. Therefore, it is best to install a cooling device.

     2. Sulfate and chloride are harmful impurities in electroplating black chromium solution. When the plating solution contains sulfate radicals, the coating is light yellow, and the sulfate radicals can be removed with an appropriate amount of sodium carbonate; when the plating solution contains chloride ions, the coating is yellowish brown, and the dispersibility of the plating solution is significantly reduced. Use an appropriate amount of chloride ions The silver nitrate is removed.

     3. It is better to use lead anodes containing 10-15% tin in this process.

Black chrome plating additives FAQ

1. Q: Do you make the products yourself? Are you a trader or a manufacturer?

     A: Yes, the products are produced by our company. Our company is a manufacturer focusing on the R&D and manufacturing of environmental protection electroplating additives. Our factory has 5000 square meters with an annual capacity of 15000 tons.

2. Q: Can your company send samples for trial?

     A: We can provide samples for trial.

3. Q: What is the quality of your products?

     A: Our company all products core raw materials is used by Germany BASF, American Dow Chemical and other international brand products. The production process is strictly in accordance with the ISO9001 quality management system, from the incoming inspection, product inspection, according to the strict inspection standard, ensure that every drop of products qualified. Product quality you can rest assured, like BYD, Huawei, Foxconn such enterprises are also using our products.

4. Q: How long is the shelf life of your products?

     A: The shelf life of our products is two years. If you do not use up the products within a short time after you buy them, we suggest you store them in a cool place, not in the sun or in a high temperature environment.

5. Q: Are your products environmentally safe?

     A: Our products have passed the SGS test and are recognized as "Green and Environment-friendly Promotion Products". Many auto parts and electronic products which use our products can pass the strict environmental protection test when they are exported to Europe and America. Therefore, we can be trusted in terms of environmental protection and safety.

6. Q: Can your company provide technical services?

     A: Yes, our company has a technical service team of more than 10 people. The technical engineers all have more than 20 years' experience in electroplating factory. They can provide customers with comprehensive technical of pre-sales and after sales.

7. Q: Is it possible to visit your company?

     A: Yes, of course. You are very welcome! We can meet you at Jieyang airport, If you can come to our city. Also you can visit our factory through live video.

8. Q: Can you customize products according to our needs?

     A: Yes, our company has research and development strength, the product formula derived from Europe and the United States laboratory, European and American engineers technical support, work together with domestic universities. Our company has a member of Guangdong province expert enterprise workstation, Shantou university science and technology correspondent workstation, Jieyang city environmental protection engineering research center for electroplating additive.Therefore, it can meet all kinds of customized requirements proposed by customers.

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