Acid Zinc-Nickel Plating Equipment
Acid Zinc-Nickel Plating Equipment (JYC-CZNi-Series)
Built for High-Volume Fastener Production
Bolts, nuts, and washers. These automotive fasteners are produced in hundreds of thousands or even millions per day. Our Acid Zinc-Nickel Plating Equipment is designed for this high-volume production. It uses a chloride acid zinc-nickel system. Current efficiency reaches 95%. Deposition is fast. Overall plating time is reduced by 30% to 40%. The coating nickel content stays stable at 10% to 14%. Neutral salt spray tests show 500 to 700 hours with no red rust. The coating is easy to solder and paint adheres well. It is especially good for parts that need thread-locking compound or Dacromet coating. The process meets ASTM B841 and ISO 15727 standards.
How We Solve the Corrosion Problem
Acid zinc-nickel solutions have chloride ion concentrations up to 130 g/L. Ordinary materials cannot withstand this. All parts that contact the liquid use strong chlorine-resistant materials. The tank has a carbon steel shell with a fluoroplastic liner. Heaters use pure titanium or SMO 254 advanced stainless steel. The filtration system uses acid-resistant magnetic pumps and PP filter cartridges. Absolute filtration precision is 10 microns. For barrel plating, we use fully immersed cross-bar barrels. This gives better conductivity uniformity.
Three Core Advantages
First, hydrogen embrittlement sensitivity is very low.
Even at high current densities, coating internal stress is under 60 MPa. We can also add a vacuum dehydrogenation furnace. Temperature is 190 to 220°C for 8 to 24 hours. This fully meets ASTM F1941. It is suitable for high-strength parts with HRC 39 to 44.
Second, the current density range is wide and composition is uniform.
We add special complexing agents. In the range of 0.5 to 8 A/dm², coating nickel content changes very little. High and low current density areas on complex parts get consistent corrosion protection.
Third, post-treatment compatibility is strong.
We include trivalent chromium blue-white passivation, black passivation, or clear sealer. The passivation film and zinc-nickel alloy layer form a dual barrier. Corrosion resistance is better.
What Buyers Often Ask
Buyers ask us: "Can one line handle all the processes?" Yes. Fully automatic rack or barrel plating are both available. All drive motors have variable frequency and thermal overload protection. Exhaust gas uses scrubbers for hydrochloric acid mist and chlorine gas. Wastewater uses secondary precipitation or membrane separation. This ensures nickel ion discharge is below 0.1 mg/L. We do EPC turnkey projects. From process tanks to automation to wastewater and exhaust, we handle it all.
Technical Specifications
|
Parameter |
Specification |
|
Current Efficiency |
≥ 95% |
|
Coating Nickel Content |
10% – 14% |
|
Salt Spray Test |
500 – 700 h (no red rust) |
|
Coating Internal Stress |
< 60 MPa |
|
Current Density Range |
0.5 – 8 A/dm² |
|
Applicable Standards |
ASTM B841, ISO 15727, ASTM F1941 |
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