clean titanium alloy

Now life to use fasteners, so the cleaning of fasteners is important, the following titanium screws to talk about the experience: not to mention a good way to clean, mainly for cold heading or cutting Titanium screws attached to the cooling oil surface oil, heat treatment oil after quenching the surface of the fastener cleaning oil. Titanium screws The first method Alkali cleaning method: The simplest alkaline cleaning is direct heating or indirect heating type cleaning tank, cleaning solution is 3% ~ 10% of N2CO3 or NaOH solution. Of carburizing or carbonitriding self-tapping titanium screws, intermediate cleaning before tempering and more heated to 50 ~ 70 ℃ 5% ~ 10% sodium carbonate solution. Connected Belt Furnaces fall into this category. Titanium screws on-line cleaning titanium screws commonly used spray and immersion double way, if the effect of rinse with hot water better, and finally the use of high-pressure airflow drying. The main disadvantage of the alkaline cleaning method is that the cleaning effect is not very good, especially the blind holes and the groove parts of the fastener are prone to stains and residues. Wastewater generated from alkaline cleaning must be neutralized and recycled to meet relevant environmental requirements before it can be discharged. The second method of titanium alloy metal cleaning agent cleaning method is: to overcome the shortcomings of alkaline cleaning method to improve the cleaning effect, the current special metal cleaning agent can be used, the cleaning agent in 40 ~ 70 ℃ water diluted into 1% to 3 % Solution, the fasteners soaked in solution 15 ~ 20min, then rinsed with hot water, and finally with a dehydrator for dehydration. Can be used in the washing machine. Disadvantages of metal cleaning agent cleaning methods are expensive, unpleasant odor and corrosive effect on titanium alloy screws. The waste water pollutes the environment, therefore, the waste water must be disposed of and the waste oil recovered. The third method of titanium screws organic solvent cleaning method: the use of trichloroethane, trichlorethylene and other organic solvents, cleaning effect is good. When the hardened fasteners are cleaned by soaking or spraying at atmospheric pressure, the volatile and splashes of organic solvents contaminate the environment. To this end, the application of vacuum decontamination solvent vacuum cleaning a full set of devices, the use of a vacuum pump to discharge air, titanium screws in the absence of air and high-density solvent vapor contact, to further improve the cleaning effect, and rely on the vacuum distillation solvent and oil recovery . The solvent content of the recovered oil decreased from 20% to less than 4%, below 50 ppm of the trichlorethylene sanitation regulations. The fourth method of titanium screw combustion burning method: cold heading or machining titanium screws into the heat treatment process, you need to wash the surface of the oil. To this end, the fasteners in the degreasing furnace can be heated to 350 ~ 400 ℃ to vaporize or burn the oil, in order to achieve the purpose of titanium screws to the surface of the oil or the effect of phosphorus removal. Burning degreasing method is only applicable to the cleaning before the heat treatment, but also to clean the cooling oil, antirust liquid and other light, low viscosity and low boiling point oil. High viscosity, high boiling point heavy quench oil will burn a lot of residue and carbon black attached to the fastener surface, reach the cleaning purpose. Fasteners that require highly clean surface finishes such as aviation bolts, automotive engine connecting rod bolts, etc., currently employ advanced cleaning techniques such as vacuum or ultrasonic to replace the commonly used chlorine-containing hydrocarbon substances that have a damaging effect on the atmospheric ozone layer as a solvent Method, you can achieve efficient environmental cleaning.