Mechanism of lubricating action of polyphosphate and heteropolyphosphate additives in tribosystems

Resumo

The phase diagrams of the Zn(PO₃)₂–Ca(PO₃)₂ and Zn(PO₃)₂–Ni(PO₃)₂ systems were studied, and the double phosphates CaZn(PO₃)₄ and NiZn(PO₃)₄ were allocated. The anions of these compounds are chain polyphosphates with PO₄ tetrahedra in the period of identity. The structures and mechanism of the action of these compounds as additives to lubricants were described using quantum-chemical analysis. Improvement of the physicochemical and tribotechnical characteristics of lubricating materials containing these phosphates compared to the traditionally used lubricating materials was confirmed in tribotechnical tests.