Black passivation solution for zinc-nickel alloy plating

zinc-nickel alloy trivalent chromium black passivation agent produces a black decorative passivation layer with high corrosion resistance on the zinc-nickel alloy coating with a nickel content of 12-18% through a simple dipping process .

Send Inquiry


Product Description

Black passivation solution for zinc-nickel alloy plating

Zn-327 zinc-nickel alloy trivalent chromium black passivation agent

Zn-327 zinc-nickel alloy trivalent chromium black passivation agent produces a black decorative passivation layer with high corrosion resistance on the zinc-nickel alloy coating with a nickel content of 12-18% through a simple dipping process .


1. Suitable for black passivation of zinc-nickel alloys containing 12-16% nickel.

2. The time for coating corrosion to appear in the neutral salt spray accelerated corrosion test: NSS >240 hours (white rust), NSS >1000 hours (red rust).

3. After passivation, it will show a uniform and bright black appearance.

4. It has good bonding force and scratch resistance.

5. Environmentally friendly products, comply with ROHS regulations.

Product Process

Solution composition and operating conditions




best value

Zn-327 black zinc water

80-150 ml / liter

100 mL / L


20-40 ℃

30 ℃

Soaking time

40-90 seconds

60 seconds





Mechanical or air agitation

Air agitation


Continuous filtration

Continuous filtration



 Post-treatment (rack plating and barrel plating) 


best value

Sealant 76

100-200 ml / liter

150 mL / L

Sealant 77

0-10 ml / liter

5 mL / L


40-50 ℃

45 ℃

Soaking time

8-20 seconds

10 seconds




Operating procedures

              Zinc-nickel electroplating → washing 2 times → hydrochloric acid 0.1% → washing 2 times → Zn-327 → washing 2 times → sealing → drying



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.

Product Tag

Related Products

Send Inquiry

Should you have any enquiries, please kindly fill in the Enquiry Form below . We will reply you within 24 hours.