Contrary to complex coacervation, simple one is not much quantitatively studied. Some authors examine polyphosphate coacervate properties such as thermal evolution 1, viscosity 2 or solubility in acid solutions 3. We experimentally induced sodium polyphosphate coacervation by univalent cation supply. This result seems to be inexplicable by present theories 4-5. So, we studied different parameters relating to coacervation and developed a theory of this phenomena for sodium polyphosphate solutions.

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In industrial application, the polyphosphate coacervates present some interest for coating metallic pieces. To explain the good mechanical properties of this coating with some metal's substrate, we have studied the interface. To obtain a good coating we have to form layer rich in phosphide near the metal bulk. This layer stops the metal diffusion in the glass coating. For metal, like iron, which may present a formation of an important layer of oxides during the curing step, it is necessary to lay down a thin layer of reducible metal like aluminum on the substrate.

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