ZDDP (Zinc Dialkyldithiophosphate)
Time：
2026-03-23
ZDDP (Zinc Dialkyldithiophosphate)
Zinc Dialkyldithiophosphate (ZDDP) is a coordination compound functioning as the primary anti-wear and secondary antioxidant additive in internal combustion engine oils by forming a sacrificial polyphosphate tribofilm on metal surfaces.
Test Standards
- ASTM D4951 - Standard Test Method for Determination of Additive Elements in Lubricating Oils by ICP-AES.
- ASTM D4172 - Wear Preventive Characteristics of Lubricating Fluid (Four-Ball Method).
- ASTM D2622 - Standard Test Method for Sulfur in Petroleum Products by WDXRF.
Formulation Significance
ZDDP decomposes under extreme localized heat and boundary friction. The resulting thermal degradation yields a zinc polyphosphate glass layer. This solid tribofilm physically separates interacting metal asperities, actively mitigating scuffing, spalling, and catastrophic valvetrain wear. It concurrently acts as a peroxide-decomposing antioxidant, neutralizing destructive oxidation precursors before base oil degradation initiates.
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