Research On Double Glow Plasma Iron Infiltration On Zr17Ti73Al6V4 Alloy Surface And Their Properties

Titanium alloys are widely used in medicine, chemical, aerospace and other fields because of their light quality, high specific strength, high melting point and high corrosion resistance. Zr and Ti elements belong to the same group elements and their nature are similar. Both Zr and Ti have high strength, high hardness and high melting point. Some Ti elements of TC4 alloy are replaced by Zr elements will form a new type of ZrTiAlV alloys. But the low hardness, low wear resistance and low corrosion resistance of ZrTiAlV alloys limit its application. Based on double glow plasma alloying technology in ZrTiAlV alloy surface preparing Fe alloying layer, in order to improve its corrosion resistance and wear resistance.The experiment explores the distance between source and workpiece, work pressure,holding temperature, holding time, source voltage, workpiece voltage, and other parameters, taking advantage of XRD and EDS detection means to analysis the layer to optimum parameters of iron infiltration: temperature 900±10℃, the time 4 h, work pressure 40 Pa, source voltage 770~950V, cathode voltage 380~520 V, distance between source and workpiece 15 mm, the thickness of the alloy layer obtained is 198μm, the alloy layer consists FeTi, ZrFe2, surface hardness is up to 660 HV.Through the study of the friction and wear performance of the alloy layer and corrosion resistance test, compared with the matrix, it learned that the friction coefficient of iron infiltrated ZrTiAlV alloy had a obviously declined, wear width and wear scar depth was significantly smaller, wear quantity was smaller, wear resistance increased. At5% H2SO4 solution, layer’s corrosion potential increased, and the corrosion current density of alloy layer was one orders of magnitude smaller than the matrix, polarization resistance increased, and the corrosion resistance improved. In 3.5% NaCl and 0.5 mol/L HCl solution, after iron infiltration, alloy layer had a obvious passivation area, corrosion potential increased, and the corrosion current density of alloy layer was smaller than the matrix, the polarization resistance increases, and further enhance the corrosion resistance.