The method of chemical blackening of titanium alloy surface, chemical blackening solution according to volume concentration is, sulfuric acid 90 ~ 120g/L, hydrofluoric acid 50 ~ 60g/L, lactic acid 100 ~ 120g/L, acetic acid 180 ~ 200g/L, citric acid 8 ~ 12g/L, sodium diethyl dithioformate 4 ~ 6g/L, the rest is distilled water. Includes the following steps: chemical degreasing of titanium and titanium alloy workpieces; Remove the workpiece and rinse it under running water; The titanium and titanium alloy workpiece is etched black; Take the titanium and titanium alloy workpieces out and stand in the air; The workpiece is washed by running water; Dry the cleaned workpiece. The invention has the advantages of simple preparation process, easy operation, high efficiency and low cost; The solution formula and the whole processing process are pollution-free, harmless to human body and environmentally friendly.
Titanium alloy has the characteristics of high specific strength, no magnetic, good corrosion resistance, wide use temperature (can work at 550℃ and minus 250℃ for a long time and maintain the same performance), and is widely used in aerospace, ships, weapons and other military industries. Titanium and its alloys are used in aircraft fuselage and skin, engines, tail cones, nozzles, ejection pods, fire walls, sandwich structures, connectors, aerospace cameras and other parts. In these fields, in order to reduce the thermal radiation of the equipment, improve the stealth ability of the equipment, improve the practical performance of the equipment such as corrosion and wear resistance and extinction and other functional purposes, it is necessary to carry out black coloring treatment on the titanium alloy surface. Moreover, the black coloring treatment of the titanium alloy surface can also meet the needs of differentiation and decoration of medical devices, daily necessities, etc.
The chemical blackening solution of titanium alloy surface is prepared by distilled water, sulfuric acid, hydrofluoric acid, lactic acid, acetic acid, citric acid and sodium diethyl dithiocarbamate. Titanium alloy surface chemical blackening solution.
