Why don t screws made in Japan rust

It does not rust because it is an alloy, and in the production process, some metals that are more reactive than iron are added. Rust generally refers to the oxidation of iron, and when these metals that are more active than iron are added, these metals are more likely to oxidize than iron. So the iron was protected and did not rust.

Friend, since you are talking about why screws made in Japan do not rust, you must have experienced it yourself, or you have seen that screws made in Japan do not rust compared to those made in other countries, right? Your words fully show that the quality of Made in Japan is very high, yes, in fact, many people have experienced that the quality of products made in Japan is quite high You said that the screws made in Japan do not rust It shows that the quality of this screw is very high, I think the "why" you refer to is not the reason why it does not rust, but an invisible technology that asks Just like the same technology and products Why ** is the same thing as high and low The appearance of the same thing Quality is good and bad. This is a kind of "invisible content", just like now people still buy products like the original and do not choose to assemble, so many products are still marked with "original imports", which is the same assembly of the product ** double or even higher, in fact, the technical process and even the actions of workers are the same, but the product is not as good as the country of origin, this is actually an invisible content, just like a screw, it seems that there is no technical content, but some are not rusty for ten years, but some are rusty in less than a year.

To put it simply, it is stainless steel, but stainless steel is also divided into many kinds, ABC class, used in food, machinery, etc. are different categories, mainly iron is mixed with some nickel-cadmium and other alloys, and some surfaces have been further treated. But this feeling is indeed much better than that of the domestic one.

What is the reason why Japanese bolts do not like to rust?

Whether the bolt is rust-resistant is mainly in the choice of bolts, and you do not put forward the requirements for the rust resistance grade of the bolt, such as blackening and phosphate.

Hot-dip galvanized, or Dacromet.

Mitte 500A, Dacrometer 500B, bolt anti-rust coating anti-rust grade is an evaluation method, under normal conditions of empty shelter, is the use of neutral salt spray test.

The method is to put the sample into a salt spray test chamber to see how long it will take for red rust to appear. The corrosion level is defined as follows: C3 requires a neutral salt spray test for 480 hours without red rust, C4 needs 720 hours without red rust, and C5 needs 1440 hours without red rust.

Here's what the salt spray chamber looks like; A lot of car mechanics love Japanese cars.

The reason is that Japanese cars are well disassembled, even if the car is more than ten years old, the screws or rust, it is easy to unscrew, but it is made in China.

The screws, the old-fashioned model, often rust and are difficult to tighten, or even unscrewed and slip easily. Why do car screws at home have such a large gap? Can't we even make small screws?

In fact, it's not that our enterprises can't make such screws, the main reason is the cost. In fact, the rust prevention of screws is not difficult, domestic enterprises also have the ability to produce screws with good rust prevention ability, and the rust prevention process of screws mainly includes: Oxidation blackening.

Screw. It's black. <>

The screw is placed in a chemical solution containing an oxidizing agent, and after heating, a layer of iron oxide is formed on the surface of the screw.

The film has a certain anti-rust ability, but the salt spray test can only reach 3-5 hours. Phosphating. It is usually black.

The bolt is placed in a high-temperature solution containing phosphoric acid and dihydrogen phosphate, and the salt spray test time can reach 10-20 hours. Electroplate. Generally silver, but there are also other silvers, mainly electrogalvanized, and the salt spray test can reach tens of hours.

Hot-dip galvanizing. It's usually silver, and when you put the bolt into the molten zinc solution, you can do 200 hours of salt spray spraying.

Impregnated with zinc. It is usually silver. The zinc cementing agent and steel products are placed in a zinc cementing furnace and heated to about 400 °C.

The average salt spray test can reach more than 240 hours. Non-electrogalvanized sheet coating. Usually silver, fasteners such as screws are soaked in solution, centrifuged, and then heated to a certain temperature in the oven.

Salt spray tests can take up to hundreds of hours. /n/n

The bolts will be coated with anti-rust powder after they are done, and the anti-oxidation work is particularly good, and Japan has unique anti-corrosion skills, so the bolts produced do not rust.

Because their galvanized coating thickness is 85 microns, it has a very good corrosion protection grade, which is not easy to rust in some cases.

They have done some antiseptic treatments, and they also have a very good ratio in raw materials, so that they are not easy to rust.

Many car mechanics enjoy repairing Japanese cars. The reason for this is that the screws of Japanese cars are very easy to remove, and even the screws of old cars that are more than ten years old are difficult to rust and easy to remove, but the screws of domestic cars are easy to rust in older models, and it is difficult to unscrew them, and it is also slippery to unscrew. Why is there such a gap in the screws of private cars?

Can't we even do a small screw withered and brightened? In fact, it's not that our company can't make such screws, the main reason is the cost, oxidation and blackening.

The color of the thread is black, the thread is added to the chemical solution containing oxidant, heated on the surface of the bolt to form an iron oxide film, which has a certain anti-rust ability, but the salt spray test can only reach 3-5 hours, it will be phosphated, generally black, the bolt is added in the high-temperature solution containing phosphoric acid and dihydrogen phosphate, and the bolt is generally soaked in the salt spray test for up to 10-20 hours, the chemical galvanized coating is generally silver, the screw and other fasteners are soaked in the solution, and the centrifugation is heated to the specified temperature with an oven, Salt spray testing can take up to hundreds of hours.

In fact, these technologies themselves are basic, not particularly advanced technology, the key problem is the cost, the current price of domestic cars is very low, the cost is compressed, when using screws, more phosphate screws, a small part of electroplating screws, other technology screw cost constraints are small. In addition, in places that screw consumers can't see, large screens, leather seats, sunroofs, configurations, and spaces can be seen at a glance by domestic consumers, which is very helpful for promoting purchase decisions.

On the other hand, the price of Japanese cars is relatively high, and there is no cost in terms of large screens, space, sunroofs, configurations, etc., but costs are set in these materials and anti-corrosion technology, so most of them are excellent in anti-rust technology. Actually, we don't need to be made in mythical Japan. The so-called screws that do not rust and do not loosen screws can also be manufactured by domestic enterprises.

However, the crux of the matter is the issue of costs and the distribution of costs. At this point, domestic car companies and Japanese car companies obviously have different trade-offs in this regard.

So why don't the screws of Japanese cars rust? This depends on the material of the screw and the post-treatment process. Many people may underestimate this sedan screw and think that it is an inconsequential part of the car.

In fact, the scientific and technological content of closed screws is very high, China's machinery industry is developed enough, but there are many screws that cannot be done by themselves, and must be imported, such as the screws of high-speed rail fixed wheels, which are imported from late destruction of Japan, with domestic ones, either loose or broken. Therefore, as the most commonly used fastener in automobiles, the role of screws cannot be underestimated.

Because of the addition of some anti-rust ingredients to Japan's bolts, Japan's scientific and technological development is very fast, and in many fields it is difficult for other countries to achieve.

This is mainly because the material and process of the screws are different, and the anti-corrosion level of Japanese bolts is also different, so their screws are not so rusty.

Japan's steel production technology is 300 years ahead of the world, and the steel does not rust and the process is good.

Most of the fasteners used in factories in the world, many screws are made by us, and there are many screws, depending on which one you use. Grade below carbon steel, grade alloy steel.

The screws with hot zinc coating are not easy to rust for many years, and the stainless steel screws are less used in the industry, and the strength is not enough, and most of them are used in some medical instruments, food production lines, and some equipment that do not require large torque. The price depends on the cost price of your purchase.

First, bolts, which are widely used and very simple fasteners, are not high in terms of technical content, and we are not unable to do it, the key is the first problem.

Bolts are steel products, iron is a relatively reactive metal, which is more susceptible to oxidation in the air, especially in humid environments. In fact, it is only necessary to do a surface treatment of the metal.

If the metal itself is not exposed to oxygen, it will not rust, or the metal material used to make the bolt will not rust if it is replaced with stable stainless steel! However, the cost of manufacturing will increase, and in general, we solve the problem from low to high economic conditions, after all, it is not bad and there is not much money.

Second, we know that the main reason for the rust of bolts is caused by oxidation.

The first is to isolate oxygen so that it will not rust if it comes into contact with the metal, and when the bolt is tightened, the screw is stained with petroleum jelly.

Live or butter, after fastening, and then brush with metal anti-rust liquid paint, which is the cheapest one, the solution.

The second is to coat the bolt with a stable metal layer, usually after the bolt is cleaned and degreased and rusted, then copper plating and then galvanizing, the disadvantage is that the cost of the process is much more expensive.

The third is to use non-rusty materials to make bolts, 304 stainless steel can be used stably for many years, 316 stainless steel can also be resistant to salt and alkali volcanic corrosion, and the corrosion resistance is better. In some places where the strength is not too high, aluminum-magnesium alloys can be used.

In places with higher environmental requirements, titanium alloys with higher strength can also be used.

Bolt. Of course, ** is straight up.

The main thing is that the bolts made in Japan are made of aluminum alloy, and the bolts made in Japan have a special process and have a particularly high anti-rust grade, so they do not rust.

Because there is a layer of stainless steel on the surface of the bolt produced in Japan, the stainless steel will not be oxidized by the air, so it does not like to rust.

The main reason is that Nissan bolts have done anti-rust work in advance, and they choose alloy materials, so they don't like rust.

Because the bolt production technology made in Japan is relatively advanced, and special anti-rust treatment is adopted. So it doesn't rust much.

The main reason for the highest socks is that the material inside it is completely different So this screw ring is not very rusty, the first point has a super strong technology will achieve such an effect The second point uses a special high-tech production route.

Because the bolts produced in Japan are made of alloy casting and are iron-copper alloys, the anti-corrosion and anti-rust effects are better.

Hello dear, glad to answer for you. Is the screw rusty steel or iron: Generally, our common screws are made of carbon steel or stainless steel.

Carbon steel is what we often call iron, which is easy to rust, although stainless steel screws have a certain anti-rust effect. But it's still going to rust. In addition to the titanium screws in many materials, the screws of other materials will rust more or less, but the speed of rusting time is different.