Chapter 1174

"Next, please Brother Shen, you wear this and wear this ......" Wang Yang brought a set of white coats, hats, masks, and gloves and handed them to Shen Kuo.

"Because chemicals are very corrosive and dangerous, it's best to take some necessary precautions to prevent accidents. Hats prevent our hair from falling into chemicals, clothes and gloves can reach the splash of chemicals, and glasses are naturally designed to prevent chemicals from burning our eyes. ”

"Masks, on the other hand, are to prevent some volatile chemicals from harming our respiratory system......"

Shen Kuo carried the equipment in a daze, and watched Wang Yang put it on in front of him, and Wu Qilang and Na Wanyan Aguta also wore such a set of equipment, that's it, for the sake of his own safety, Shen Kuo also wore it in the same way.

Wang Yang's chemical laboratory has been established for almost a month, but most of the time he is conducting various experiments by himself, and Xu Chang and Wang Lie are so there, so they will act as Wang Yang's assistants, if the two are not there, then Wu Qilang and Wanyan Agu will be on top.

Occasionally, when Wang Yang was interested, he would guide Xu Chang and Wang Lie, who were very interested in physical chemistry, to conduct some interesting and less dangerous chemical experiments.

A glass of high-concentration alum oil and a cup of low-concentration alum oil were placed on a clean white tablecloth, while next to them were a few metal strips with a shiny metallic luster, and a few metal strips with a dull and slightly yellow rust.

At this time, Wang Yang picked up a special crystal glass clip, and carefully put one of the rusty metal strips into the low-concentration green alum oil, and soon he could see fine bubbles emerging on the surface of the metal, and after a short time, those yellow rust stains began to fall off.

By the time Wang Yang picked up the rusty metal strip again, the rust on the surface had disappeared without a trace.

"That's what you call pickling and rusting, right?" Shen Kuo was a little excited, he really had never seen such an interesting scene, or should I say, be able to watch the rust fall off because of pickling so intuitively.

"Yes, and here, there is already alum oil with a concentration of at least 70% or more, and what will happen to this rusty iron bar? Look at ......" Wang Yang was like an excellent chemistry teacher, once again picked up the rusty iron bar and immersed it in a high concentration of concentrated sulfuric acid.

Only sporadic bubbles can be seen on the surface of the metal, but there is no evidence of a large number of bubbles formed when immersed in low-concentration alum oil.

"This ...... This is also too strange, a low concentration of alum oil can corrode those rust stains, but this high concentration is actually not? Shen Kuo's face was full of doubts, and in the end he still asked such a sentence.

"Is this really a high concentration of alum oil? Or something else......"

"Actually, if you want to test whether this is a high concentration of alum oil, it's very simple." Wang Yang smiled and nodded towards Wanyan Aguda next to him.

Wan Yan took a glass plate, and then took a ball of cotton from the side.

"Brother Shen, this is cotton, next, I will use a low concentration of alum oil and a high concentration of alum oil to drop on it, and you will be able to know the authenticity."

As Wang Yang spoke, he took a few drops of low-concentration alum oil and dropped it on the cotton first, and immediately a puff of clear smoke came out, and then a large amount of foam began to emerge from the snow-white cotton, which changed and carbonized and blackened at a speed visible to the naked eye.

"Alum oil can turn cotton into carbides, and this process is what I call the carbonization reaction." Wang Yang sniffed, very awesome.

"Next, please look at the carbonization reaction of high-concentration alum oil drops on cotton......" As he spoke, high-concentration alum oil drops fell on cotton, this time, the reaction was more intense, and the carbonization process was faster.

At this moment, Shen Kuo also had to admit that Wang Yang was not cheating, this was really a high-concentration alum oil.

"Shen actually suspected Brother Xian, it was really ...... However, if it weren't for this test, it would be really hard for Shen to believe that this high-concentration alum oil would actually have nothing to do with those rust stains. ”

Next, Wang Yang took a piece of metal strip with a very bright metallic luster, then immersed it in concentrated sulfuric acid, and after standing for a while, he took it out and put it in the crystal glass plate that had been prepared a long time ago.

At this moment, the original bright and blind metallic luster has dimmed, and on the surface of the metal, it has shown a gray color.

After standing for a while, Wang Yang brought cotton and wiped off the residual alum oil on the surface. After that, I rinsed it with clean water, and then I dared to hold it in my hand.

"Look, a passivation film has been formed on the surface of this metal, and with the existence of this passivation film, steel products that are extremely easy to rust will become difficult to be corroded."

"So how can we know if the passivation is really successful?" Shen Kuo took the passivated metal strip and looked at it carefully and asked.

"It's very simple, there is a piece of metal of the same material here, but it has not been passivated, you only need to place these two metal strips in the open air, I believe it will take a few days to understand whether the metal after pickling and passivation has an anti-rust effect."

Wang Yang picked up a piece of metal that he hadn't had time to test, handed it to Shen Kuo and explained.

"Reasonable, then Shen will try it......" took the metal bar from Wang Yang's hand, held one in one hand, and left the chemical laboratory without looking back, leaving the three people in the room who were still confused.

"Uh, huh? Brother Shen, Brother Shen, you...... You wait...... You haven't changed your clothes yet......" Wang Yang was stunned for a long time before he reacted, and directly rushed out of the laboratory with a lunge and chased forward......

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Shen Kuo smiled a little embarrassedly and returned to the chemical laboratory to take off the equipment on his body, but he still held the two metal bars tightly.

Seeing Shen Kuo looking at his chemical laboratory with envy on his face, the corners of Wang Yang's mouth raised a strange arc. "If Brother Shen doesn't dislike the simplicity of the little brother here, he can come here often, this chemistry ...... of the little brother"

"Okay, that's no problem, then I'm going to come over and bother you often, but can I bring one or two people over, Shen's command also has a few disciples......"

Wang Yang was not displeased that Shen Kuo interrupted his words, but nodded happily and agreed to Shen Kuo's request. "Of course this is no problem, it is naturally a good thing to be able to learn from each other, Brother Shen, and your disciples."

"In addition to this chemistry laboratory, I am going to build a physics laboratory in the house next to it, and when the time comes, whether it is a physical test or a chemical test, Brother Shen and his teachers are welcome to come over......