①Blackening Treatment

1. Excellent protective performance: The dense oxide film can effectively isolate corrosive media such as air and moisture. Combined with subsequent anti-rust treatment, it can significantly improve the corrosion resistance of bearings. Meanwhile, it can block hydrogen atoms from penetrating into the bearing material, reducing the risk of cracking.

2. Optimized friction characteristics: The film layer has good lubrication compatibility, which can enhance the adhesion of lubricants, improve anti-slip performance, and reduce micro-pitting and wear under low-lubrication conditions. It is particularly suitable for the running-in stage of bearings, enabling rapid chemical running-in.

3. Precise adaptation to scenarios: The process does not affect the dimensional accuracy of bearings, making it suitable for scenarios with strict precision requirements such as aviation, precision instruments, and wind power gearboxes. It can reduce the risk of fretting wear in vibrating environments and lower equipment downtime and maintenance costs.

4. Environmental protection and high efficiency: Modern blackening processes have overcome the high energy consumption and high pollution drawbacks of traditional high-temperature oxidation. They adopt medium-to-low temperature technology, generate no harmful gases, and feature simple operation and rapid film formation.

Applicable Areas

· Large bearings can bear dynamic loads and impact loads, which are used in wind power gearboxes and high-speed shafts;

· Precision bearings with high requirements for dimensional accuracy and protection, which are used in aerospace and precision instruments;

· Bearings for mechanical transmission systems that require reduced light reflection and improved appearance decorativeness.

②Phosphating Treatment

1. Superb adsorption and lubrication: The microporous structure can adsorb anti-rust oil and grease strongly, and form a stable lubricating protective layer, which improves the wear resistance and oxidation resistance of bearings in humid and high-temperature environments significantly, and extends service life.

2. Wide adaptability: It is suitable for various bearing base materials such as steel, cast iron, and cast steel. It can solve the problem of inconsistent treatment colors for different materials in traditional processes, and achieve a uniform surface effect.

3. Stable and controllable process: The film has fine crystals and strong adhesion. Both the salt spray test and corrosion resistance can meet national standard requirements (e.g., resistance to 3% CuSO₄ immersion＞180s). Additionally, the bath solution is stable, do need complex on-site test, only need regular replenishment to maintain the process effect.

4. Multi-functional expansion value: The phosphating film has protection and lubrication function, which also can serve as a coating base to enhance the adhesion of subsequent coatings. During the bearing processing and assembly with pressure, it can reduce frictional resistance effectively and protect the workpiece surface from damage.

Applicable areas

· Deep groove ball bearings with block used in humid, dusty environments with corrosive media;

· Bearings for automotive transmission systems and construction machinery, which need to withstand harsh working conditions for a long time;

· Bearing components require subsequent coating or pressure processing.

Existing phosphating classifications:

1. Zinc series

2. Zinc-calcium series

3. Manganese series