Ultrasonic bath. Part 2

In the previous part, we learned what the device consists of and how to configure it. We learned how to correctly calculate the resonant inductor and many other subtleties in this craft.

The first part



Now we feed and we see that the timer immediately draws zeros, and thereby goes into standby mode. Turning the encoder knob starts the bath for a predetermined time interval. The shallow left variable resistor performs a rough adjustment of the resonance frequency, which can be judged by the current consumption on the ammeter. In my case, the scale is three amperes. A large right-hand resistor provides more accurate frequency tuning. It is important to ensure that the current does not exceed more than three amperes, otherwise the power supply will go into spacing, at least mine.



It is time for water treatments. Pour water about one quarter of the total volume. We adjust the frequency until funny structures from cavitation bubbles, popularly called spider webs, begin to form. These mobile milk clots from which "tentacles" curl, resemble streamers of electrical discharges in dense media. Although their nature is of course different.

Let's try to lower a piece of foil. This method is used to objectively evaluate the force of cavitation formed in ultrasonic media. It destroys the oxide film on the surface of the foil.



We add the remaining water to the gastronome containers and we get exactly a liter.Turn the knob and find the resonance. It can be seen that the cavitation areas are not uniformly distributed, they walk in time with the blushing surface of the water. The life of small bubbles is complex and amazing. They oscillate, grow, reach a critical size and then collapse.

When a bubble collapses, a converging shock wave forms inside it. As a result, local sections with very high pressure and temperatures (up to 10 thousand degrees) are formed in the liquid. It is because of such cavitation bubbles that even ordinary water becomes chemically active. Such a destructive force lurks around us.



Let's get back to resonance.With a small amount of water, the maximum that happens is the Hladni figures, which depend on the frequency. We add a little liquid and the resonance will go away, but if you find a resonance again, the effect of work will already look like a humidifier. If you pour a lot of water, we get a mound on the surface. In general, the fluid level must be selected experimentally. I even observed the regimes when the liquid itself evaporated from the gastronome container, which seemed slippery like ice if you touch it with your fingers. A piece of foil perfectly demonstrates the effect of vibrational sliding along the bottom of the bath. Something reminded of air hockey in a local amusement park.

Pour some magic powder to obtain figures. Hladni formed by the accumulation of small particles near antinodes or on nodal lines on the surface of an elastic vibrating plate. Drawings are named after the German physicist Ernst Hladni, who discovered this effect.



We figured out the principle of work, now we can move on to the next part. The hamsters were given the task of scrapping all kinds of junk through the gouges with which they did a good job. But before you start irradiating rare things with ultrasound, I will check the effectiveness of cleaning on my fingers. It feels like acupuncture, as if a bunch of needles at the same time stabs you in the finger. And what kind of white crap is separated from the skin, I do not even want to know. Doing so is definitely not worth it!



Let's see what happens with rusty glands.Of interesting specimens, there was a buckle from the time of ancient Russia, and a hefty bolt that you unscrew with your hands figs. We turn for help to ordinary table vinegar, which, as you know, perfectly copes with any traces of rust. Pour it in a small amount so that the level rises above the parts by about a centimeter. In short, we do not regret acid. We put a piece of iron at the bottom, wait a couple of minutes, then we start the gravitsap



Now about the results. This is how the pieces of iron looked before cleaning, and so after. Surprised by the old nail, all the results of many years of metal destruction became visible on it.

The buckle was surprisingly vigorous in terms of destruction, apparently the blacksmith knew a lot about his business. The nut began to unscrew effortlessly, though there were still traces of rust under it, but this is nothing considering that cleaning is even in such inaccessible places.



All inscriptions were readable on the die, and the cutting part inside returned to its original youth. The whole process took no less than two hours. You say a lot ?! Oh come on!



Such an iron shmat is a good load for an ultrasound system. Therefore, for a normal result, it takes time. Now the place of the rusty die has become rusty water. I was also pleased with the look of the buckle, for the first time in many centuries it stirred. I’ll fit it to my watch.

Another interesting effect was discovered when vinegar in the bath was not enough. The entire volume of liquid from the middle tried to evaporate somewhere. I suppose there is simply an area of ​​increased pressure, which is pushed into the area of ​​reduced pressure.



Here is another example, Penny and Money before cleaning.



And it looks like after cleaning. I’m wondering, are coin restorers using this method? In any case, in such a variation of the ultrasonic bath, you can choose the time and power of cleaning, for an optimal result.



We will conduct another experiment, these are two copper solid Jan Casimir from the Middle Ages.



We will dip one instance into the gastronome containers, and try to clean the other in disodium salt, the second name of which is Trilon B.



Since the heat has gone, we’ll take a whole handful of coins and put them to the first solid, who is already taking healing baths. This will remove all the dirt from the coins and visually it will be clear how Trilon B. works. Take a teaspoon of this wonderful powder and dilute it in a glass of water. The more disodium salt, the stronger the effect will be, but you should not get carried away much, since this proportion was too active for me.



We throw a handful of previously cleaned coins on which oxides, dirt and so on still remain. After a couple of minutes, you can observe how the reaction started at the bottom and the solution began to turn green. In general, it will be more correct to set all the coins on the edge, so the reaction will be more even.



The next morning, the solution annihilated and turned blue, just like the cocktail served on the beaches of Malibu. We move the sample in a trough with ordinary water. Trilon B converted all the oxides into a brown swamp. Now the coin will expose its body in the rays of cavitation rays.



Final result. Metal on which there is neither dirt nor salts under the patina nor the patina itself, there is nothing. Coin is killed. Here is an example before cleaning, after cleaning in water and after cleaning in trilon. Sadness longing sadness.



You can try to return the appearance of the coin in the good old way. We polish the coin with an iron brush to shine.



We will make an artificial patina with the help of 33 percent sulfuric ointment, purchased at a pharmacy across the road. In the first seconds after rubbing, you can see how the body of the coin darkens. Copper reacts.



The next day, three coins with a soft cloth until relief and all letters appear. In any case, such a coin is more readable than it was. But these shells on the relief ...
In short, never do that!



In the next experiment, we sprinkle a little soapy "Big-eared Nanny" into the gastronome container and pour a little water. Such an alkaline solution cleans silver and gold well from any adhering organic dirt. This is especially true if the jewelry has a complex shape. With inaccessible places the bath is easy to handle. It is for this reason that millions of people buy such units from the Chinese.



If instead of soap, pour alcohol-gasoline solution into the container, then you can clean the printed circuit boards from rosin. Using white spirit, you can clean Aivazovsky’s brushes. Printer repair companies use this method to clean clogged nozzles and nozzles in cartridges using a special flushing fluid.



Time to take stock. Someone will surely say why should I do such nonsense if I can buy a similar bath for aliexpress for just 30 bucks ?! It says 50 watts and all that. You are welcome. 50 W is also written on Chinese speakers and laser pointers, but this does not mean at all that everything is so. In cheap sinks, dead piezics and sufficient power to develop cavitation cannot simply be obtained, even replacing the native generator with a more powerful one.



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