Process for phosphating titanium alloys using a zinc-magnesium-calcium-based solution

The invention relates to a process for phosphating titanium alloys using Zn-Mg-Ca-based phosphating solutions, in order to obtain thin, porous layers capable of promoting osseointegration and biocompatibility of implants made of titanium alloys, by increasing corrosion resistance and achieving a morphology that favors cell adhesion. This involves depositing a Zn-Mg-Ca-based phosphate layer through a phosphating process that includes grinding, degreasing, pickling, and surface activation steps. The phosphating solution contains, magnesium carbonate, calcium nitrate tetrahydrate, as well as corrosion accelerators and inhibitors. In practice, the invention offers the following advantages: it is easily applied by immersion at low cost; it allows for the formation of coatings with high adhesion to the substrate; the formed layers exhibit long-term stability; it improves osseointegration due to increased corrosion and wear resistance of the substrate, as well as due to morphological characteristics favorable to cell adhesion.