On the edge of the freight yard, Du Zhongxiao watched Tao Seventeen bring a few soldiers and add tin blocks to the built pool. On the side, Thirteen Lang and Chen Qin squatted on the ground, watching the soldiers carry the coal over, and couldn't help asking, "Official, what are you going to do with tin burning here?" ”

Du Zhongxiao said: "Burn the tin and plate it on the iron." ”

Thirteen Lang looked at Chen Qin, couldn't think of how tin could be plated on iron, let alone what he could do when plated on iron, and shook his head. Chen Qin couldn't think of it, the two squatted on the ground and watched quietly.

The pool was filled with tin blocks, and Tao XVII was directing the soldiers to light a fire underneath. He also ordered another group of soldiers to wipe the steel plates made yesterday with vinegar one by one and set them aside.

The sun climbed into the air, the air warmed up, and Du Zhongxiao felt a little lazy. Tao Qiqi has been by his side for a long time and has learned a lot. As soon as he said a lot of things himself, he knew how to do it, which made Du Zhongxiao more and more lazy to do it.

The melting point of tin is very low, and the coal fire burns up, and it doesn't take long for the tin in the pool to start melting. From the dusty tin block, it slowly turned into a bright white liquid, which looked a little dazzling in the sunlight.

Tao Qiqi straightened up and crossed his hands beside Du Zhongxiao: "Official, the tin in the pool has been melted, I don't know if you can add iron?" ”

Du Zhongxiao nodded: "Yes." Remember to be careful not to burn yourself. Entering from one end and coming out from the other, remember not to rush or delay, so that the tin is evenly plated on the iron plate. The hundreds of thousands of pounds of iron in the prison have all fallen on this. ”

Tao Seventeen promised, took the soldiers, sandwiched the vinegar-rubbed steel plate with pliers, and gently put it into the tin pool. There are carved grooves in the pool, just enough to jam the steel plates. There are holes on both sides of the steel plate, which is inserted with a sharp needle and slowly pulled to the other end and pulled out of the pool.

Out of the tin pool, the steel plate was plated with a thick layer of tin, and after a while, it dried. The tin-plated steel plate became extremely shiny, and in the sunlight, there was a silver sheen.

Thirteen Lang and Chen Qin felt strange, and went up to see it together, and they were amazed. Although the fried steel plate is pure after forging, it is actually blue-black due to the oxidation of the surface layer when cooled. Only after sanding with sandpaper will it appear bright white, but it does not have this color.

Du Zhongxiao stepped forward to take a closer look, and saw that due to the inadequate treatment, the technique was also rusty, and the plating was not uniform. This is something that cannot be helped, the current conditions are poor, it is rare to be able to plate tin on iron, and it is difficult to go further.

Another metal is plated on the metal, and the most common one seen in the previous life is electroplating, which has many benefits. At this time, where can Du Zhongxiao find electricity? Fortunately, there is also a method of physical plating, which is hot-dip plating. The melting point of tin is low, and after melting, the steel plate is infiltrated and can form a strong coating, which is tinplated steel plate, which was also known as tinplate in the previous life. The most important use is to make containers, such as cans.

Of course, Du Zhongxiao didn't use tin-plated iron plates to make canned food, which was too extravagant. What Du Zhongxiao wants to do is to use this iron plate to make iron money. After the steel plate is tinned, it can resist oxidation and maintain this color all the time. Moreover, this kind of iron money cannot be recast, which can prevent the people from using it to melt the legal iron money and then mint it privately. Since only tin can be plated on iron plates, and pig iron cannot be used, money can only be punched, not cast.

With these characteristics, compared with the iron money that is now in circulation, and even more than copper money, this kind of money is more able to prevent private minting. And if you can prevent private minting, you can appropriately increase the face value of coins, so that the minting of money will not be at a loss. As long as the minting of money no longer loses money, and the bad money minted by the people is prevented from driving out the good money, many economic problems will be solved.

Nowadays, whether it is private transactions or official tax revenues, a large number of physical objects are used. It's not that people don't know the benefits of monetization, it's that there's really no reliable currency. The production of gold and silver in the Great Song Dynasty was not much, and even copper was insufficient, and it was impossible to monetize the entire economy. Banknotes in the form of Jiaozi face the same difficulties, it is difficult to prevent private printing, and they also face credit problems.

After a while, Tao 17 came out with dozens of tin-plated iron plates made by the soldiers.

Du Zhongxiao saw that the number was almost there, and ordered to stop. The charcoal fire under the pool was removed, and the top was covered for later use.

Thirteen Lang took a plated iron plate, looked at it over and over in the sun, and said, "Official, what is the use of this steel plate?" ”

"Make money." Du Zhongxiao said these two words simply, and let Tao Seventeen kill the iron plate and go to a machine on the side.

This is a stamping machine, with a simple structure, in fact, it is not much like a forging hammer. But on the hammer and the anvil, there are two molds, both of which are made of stainless steel. The patterns and words on the mold are the front and back of the current steel coin.

A sergeant took an iron plate and put it on the punch, and Du Zhongxiao personally commanded the two soldiers and shook the punch with a handle. When it was shaken to the highest point and the pins were pulled open, the punch smashed on the anvil under the action of gravity, and even the ground shook.

The people around him were caught off guard and were taken aback.

Du Zhongxiao instructed the soldiers to shake the punch again, take away the steel plate, and go forward to check the iron money that had been washed down. Due to the lack of momentum, the burrs around the iron coin are very obvious, and there are traces of extrusion. The patterns and text on the front and back of the iron coin are slightly blurred.

Holding it in his hand for a while, Du Zhongxiao sighed: "This punch is a little smaller, and it is still not enough to flush money." ”

After speaking, he handed it to Tao Seventeen, who was watching from the side. Tao Qiqi took the money in his hand and said, "Ah, how is this good?" We've worked so hard to get it, but it's still not working? ”

Du Zhongxiao said with a smile: "This machine is small and lacks strength, of course it can't." You see the top of this money, the top is clear, it's tin, it's clear because it's softer. It's not good down there, it's iron, because it's hard, and the machine can't press it clearly. This is not a bad thing, it shows that this kind of iron money must be suppressed well by large machines. Where can the big machine be made by the people? In this way, it can be more prevented from private piracy. ”

This small punch was originally modified with a forging hammer, since it doesn't work, then use a big one. According to Du Zhongxiao's idea, if this method is feasible, then use water conservancy to build a large punch press and punch iron money day and night. Everything went well, and the hundreds of thousands of catties of iron in Datong Prison actually couldn't make much iron money.

After speaking, Du Zhongxiao asked the soldiers to punch nearly a hundred iron coins and carefully check the gains and losses. After reading it, I basically confirmed that the thickness set now is basically the same as that of the copper coin, and the size is also appropriate. This thickness must use a large punch press, and the money punched out will be exquisite, and the small punch is shoddy, and it can be distinguished at a glance. The only trouble is that the iron of the punch is exposed, and I don't know if it will be seriously corroded. Du Zhongxiao couldn't make up his mind, whether to punch out the iron money first, and then go to dip plating. Just by doing that, the process is overly complicated.

The greatest significance of making this kind of money is not to make money with the iron of the Chase Prison, but to allow the market to have a suitable and sufficient currency to use, and economic activities and taxes can be monetized. Moreover, the cost is lower than the value of the currency, and the official can make a profit by making money, that is, seigniorage. With these two things, many of today's economic problems can be solved.

This is the most meaningful thing Du Zhongxiao has done for this era. It's a pity that I don't know how much benefit I can get from a small contract.

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