Binary eutectic solutions are analyzed as a foundation for a Generalized Lattice Model of each component. Phase transitions of binary solutions depending of concentration of its components and temperature are determined with equations for invariant two-phase equilibriums by construction of binary-phase diagrams. The paper demonstrates a possibility to construct binary-phase diagrams with minimal error with respect to reference sources. An example of cadmium-zinc alloy is used to show changes in its characteristics depending on percentages of its components. An application is suggested for items with cadmium-zinc coating.