Industrial titanium screws do not require special preparation for fusion welding with contact welding. When there is a thicker oxide film layer, you need to use the mechanical cleaning of the party did not or in a 5% solution of hydrofluoric acid will remove it.
Titanium screw manufacturer
Titanium screws arc welding, in a clean Bai sex gas (helium, argon) gas weave, and with direct current can achieve better results, when the tungsten electrode is the cathode.
Direct fusion of titanium screws with nickel, brocade chromium alloys and other alloys containing nickel is not suitable because of the formation of harmful fusible eutectic crystals. In this case, between materials of different nature, it is necessary to place spacers with a thickness of 15-20 microns, they are usually molybdenum, tantalum or niobium. In compliance with this condition, titanium screws or parts fused to nickel or nickel alloys can be annealed and degassed very smoothly at temperatures up to 1500°C in vacuum or inert gas.
Anodes for platinum-plated titanium screws have been in use for many years. The methods of platinum plating on titanium screws are electroplating (molten salt plating) and pyrolysis, but also direct cladding, such as explosive compounding. Platinum plating is usually carried out in a cyanide molten salt bath with a cyanide ratio of 53% sodium cyanide and 47% potassium cyanide at a temperature of 520°C. The platinum sheet is used as a soluble anode. The thickness of the plating is 1500 um and the deposition rate is 20-25 um/h. With aqueous solution plating, the deposition rate is low and a thicker layer is not obtained.
Aqueous silver plating process is simple and easy to operate, but the thickness of the plating layer - generally can not exceed 2.5um. titanium screw manufacturers if the use of extra-vein plating process, you can get 3-6um thick bright platinum plating. The aqueous solution is H2Pt(NO2)z2S04, containing 5-l0g of platinum per liter of solution, with sulfuric acid pH 1.2-2, the temperature is 50 ℃, the current waveform is cloudy, the break-through ratio is 5-9, the average current density is 50-100A/m2, the anode is the anode. 100A/m2, the anode is pure platinum. Iridium and platinum coatings on titanium have a very low chloride precipitation electrovalence in the chloride, the research and application of this titanium screw anode has received more attention. The use of thermal decomposition method to prepare this type of Chin electrode DingYi and the preparation of rust-oxide electrode is similar to the case: the platinum and iridium chloride dissolved in butanol and anisole volume ratio of 3:1 mixture, tI, its small noble metal content of 2.13mg/cm3, where the mass ratio of platinum and iridium is 6:4; in the titanium specimen brush coated with this mixture, dry at 500 ℃ for heating film formation. This needs to be repeated several times until the required thickness is reached, and the thickness is usually controlled at about 20g/m2.