In the field of brake disc coating, equipment is becoming increasingly intelligent. However, what truly determines coating stability and long‑term operational performance is often not the equipment alone. The coating liquid is the core medium that runs through the entire coating system.
If the production line defines the upper limit of production capacity, the coating liquid determines whether this line can operate over the long term, stably, and at a low cost.
The coating liquid is not merely a “material” — it is an integral part of the process system.
Brake disc coating imposes distinct industry‑specific requirements on the coating:
- Stable anti-corrosion performance
- Uniform coating layer and consistent appearance
- Compatibility with different disc types and spraying methods
- Resistance to production cycle variations and long‑term operation
This means that brake disc coating liquid is not simply a chemical material, but a systemic element deeply integrated with equipment, processes, and production cycles.
A truly mature brake disc coating liquid must be “production-line friendly”:
- Adaptable to automated and intelligent spraying rhythms
- Suitable for multi-variety, flexible production scenarios
- Capable of maintaining a stable processing window during high-efficiency operation
As brake disc coating enters the era of intelligent manufacturing, with faster production cycles and more precise process control, higher demands are placed on the processing stability of coating liquids.
An excellent brake disc coating liquid should feature:
- Strong processing adaptability to minimize impacts from process fluctuations
- Consistent film-forming performance to ensure batch-to-batch uniformity
- A favorable physical property window to reduce debugging and maintenance costs
Only when the coating liquid is highly matched with the production line can coating quality be truly system-guaranteed, rather than experience-dependent.
Based on its in-depth understanding of the long‑term operating rules of brake disc coating, Junhe believes that the value of brake disc coating liquid should not be limited to “meeting specifications”.
In practical applications, the real test of a coating liquid lies not in its short-term performance, but in its ability to maintain consistent stability under different production line conditions, varying production cycles, and diverse product structures.
It is against this background that Junhe has always positioned coating liquid development from the perspective of the entire coating system — not as an independent material, but as a critical component serving intelligent and flexible production lines.
Junhe Brake Disc Coating Liquid
JUNHE® 310G Waterborne Zinc-Based Coating Liquid for Metal Corrosion Protection is a chromium-free coating solution. Developed to meet the corrosion protection requirements of brake discs in the automotive industry, it is designed for high-frequency induction heating applications. Adopting advanced technical formulations and high-quality imported raw materials (Patent No.: ZL2003101061714), this product contains no toxic heavy metals such as chromium, mercury, lead, or cadmium. It improves production efficiency, saves energy consumption, enables intelligent operation, and reduces labor requirements.
1. Product Overview
This coating liquid consists of three components: A, B, and C.
- Component A: A silver-gray paste mainly composed of ultra-fine flake zinc, aluminum, and water-soluble organic additives.
- Component B: An additive component of the coating liquid, which is an aqueous solution formulated with corrosion inhibitors, special regulators, and other functional additives.
- Component C: A thickening component of the coating liquid, mainly a white to yellowish powder of cellulose-based materials.
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| Serial No. |
Item |
Specification |
| 1 |
pH value |
4.8-7.5 |
| 2 |
Specific Gravity |
1.35±0.05 |
| 3 |
Viscosity |
2# Chai Cup, 25–45 seconds (Spraying) |
| 4 |
Operating Temperature |
20±2℃ |
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2. Features & Advantages
- Eco-friendly and chromium-free, with excellent leveling property, fine surface finish and no hydrogen embrittlement.
- Only 7.5–10 seconds of heating per cycle by high-frequency induction heating.
- Passes the cross-cut test in accordance with GB/T 9286-1998, reaching Grade 0.
- Heat resistant up to 300–400 °C with stable salt spray performance at high temperatures.
- The product provides outstanding corrosion resistance in salt spray test: 240 hours with one coat and one cure.
- Complies with EU RoHS and REACH regulations.
- Meets Volkswagen standard TL 193-2012-12.
- Listed in Volkswagen’s supplier directory.
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