The working temperature is 300 C, will the carbon steel fall off after chrome plating???

Laser marking machine, pneumatic marking machine, and electric corrosion marking machine are mainly divided into:

According to the classification method of international custom, laser products include laser processing, medical, printing, optical storage, including collimation, inspection, civic education in various laser instruments and equipment, laser devices and communication laser components and laser materials and components11. , the fastest growing laser ranging and collimation laser processing in China, the largest sales volume (in the past two years, the growth rate of YAG laser processing equipment is 46 -60 yuan, and up to 90 trillion yuan, surpassing CO2 laser processing equipment). The laser medical market was developed earlier, once it grew rapidly, but it was in a downturn, and the sales volume hovered at 55 million yuan.

The high-end market is almost completely occupied by foreign products, but the development of Tianjin University, the TD-98 type Q-switch ruby laser ** machine wins by quality, and has passed the US FDA and export volume. In 1998, the classification of lasers showed that some solid-state lasers and semiconductor lasers accounted for a strong solid-state laser market and a rapid growth trend of semiconductor lasers. Diode-pumped solid-state lasers (pulsed, continuous, single-mode stabilized, microchip, frequency doubling) will be the new growth point.

The working principle of the pneumatic marking machine.

To print Chinese and English characters, the content of the graphical computer input, the content of the computer marking software is converted into a digital control signal and sent to the printing controller, and the characters and graphics composed of the continuous grid of the workpiece on the drive; The needle in X-Y is two two-dimensional planes consisting of a set of trajectories, while under the action of the compressed air of the printing needle, on the surface of the workpiece, in order to print a concave mark composed of a dense dot matrix.

What kind of environment are you in this 300 degrees?

After electroplating, you can send the heat treatment plant to 600 -650 with the furnace to heat up to 600 -650 for more than 4 hours, so that the coating and the substrate diffuse each other to further improve the adhesion. The coating is treated in this way to withstand impact and rapid temperature changes.

Heating method with the furnace: first raise the temperature to 200, keep warm for 30 minutes, then heat up to 300 for 30 minutes, 400 for 30 minutes, 500 for 30 minutes, and finally 600 -650 for warming, and cool with the furnace.

The adhesion of electroplated stainless steel is often prone to problems, but as long as the pretreatment is done well, the pass rate is very high. In order to prevent waste, small test pieces can be used for experiments first, and then formal production can be carried out after verification.

It's more cumbersome, and I look forward to a simpler way.

Plating will not, waterproof and rusty! If it's not plated, it won't work...If the water goes in, it will fall off!

It's going to rust.

Only when the coating is dense and porous can it have a protective effect on the substrate. The Achilles heel of the chrome coating is the presence of pores and cracks, and the brittleness of the chromium layer is large, and the local area is compressed or impacted.

, the coating is very prone to cracks. In this case, the moisture in the steel matrix in wet weather will penetrate through the pores of the chromium layer and penetrate to the surface of the matrix metal, so that the chromium and ferrocouple form a microbattery, and the actual potential of iron in chromium and ferrocouple is less than that of chromium, so as anodic corrosion, the corrosion product is rust, and overflows the surface through the pores of chromium to form a pan point, and with the continuation of time, the pan point continues to expand and increase, and the result spreads throughout the surface of the workpiece.

Since the linear expansion coefficient of chromium and carbon steel is different, the coating may fall off and crack after heat treatment after chrome plating. In fact, the hardness of hard chrome plating can reach HRC56 60, and the hardness should not be low.

I really don't understand the lowest hardness of chrome plating has HV500 650, why do you still need heat treatment, not to mention that the heat treatment due to the difference in the linear expansion coefficient of chromium and carbon steel will make the plating fall off and crack, that is, how to solve the problem of oxidation (to achieve heat treatment to improve the hardness of the chrome plating layer, its temperature can not be too low), once it is oxidized, then the carbon steel wire chrome plating will be a waste product! Therefore, it is recommended that you change the process and directly plating hard chrome on the carbon steel wire, and the problem is solved!

The substrate can be heat treated, and the hardness should be about 1000V after chrome plating.

As the temperature increases, the tempered martensite undergoes a structural transformation.

The main reason is that martensite is an unstable structure, it is a supersaturated solid solution of carbon in -Fe, because the supersaturated carbon atoms are in a squeezed state in the crystal lattice, with the increase of temperature it has a tendency to run out of the lattice gap (dissolving), the higher the tempering temperature, the stronger the diffusion and migration ability of carbon, the formation of segregation of supersaturated carbon atoms, initially (when the temperature is lower) precipitates carbides, and finally (above 300 temperatures) is transformed into Fe3C (cementite) structure.

Therefore, temperature is the key to the transformation of martensite, so to speak, as long as martensite is present, it has a tendency to transform when heated.

Iron electrochrome plating, which can be done without rust.

The chrome plating process is pre-plated copper, thick copper plating, semi-bright nickel plating, bright nickel, decorative chrome plating and other processes. It can be done without corrosion.

Of course, the plating is mechanically damaged and will corrode.

Usually chrome plating is the plating of three layers, namely copper (or copper-tin alloy), nickel, and the outermost layer is chromium. Whether it rusts or not depends on the thickness of the coating and the porosity of each layer. If it is in a harsh environment for a long time, it will still rust.

If the chromium layer completely covers the iron, of course, it will not, but the chromium layer should be thicker, otherwise it will wear out and rust over time