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First, what is Salt bath quenching
Salt bath quenching is a method of metal quenching, which is to heat the metal to a certain temperature and immediately immerse it in a high-density brine to cool it quickly. Compared with ordinary water quenching, brine quenching can improve the hardness, strength and wear resistance of the metal.
Second, the principle of Salt bath quenching
The reason why Salt bath quenching can increase the hardness of the metal is that the brine cools faster than ordinary water, so that the grain of the metal is refined. The finer the grain inside the metal, the less the void, the less likely it is to have defects such as cracks, thus improving the strength and hardness of the metal.
At the same time, salt water also contains salt, when the metal is immersed in salt water, the salt can neutralize the oxide on the metal surface and protect the metal surface. This helps maintain the appearance quality of the metal and prevents the effect of the surface oxide layer on the properties of the metal.
Third, the advantages of Salt bath quenching
1. Improve hardness: brine quenching can improve the hardness of the metal, making it more suitable for making knives, scissors, needles and other tools that need high sharpness.
2. Increase strength: salt bath quenching can increase the strength of the metal, making it more suitable for making parts such as mechanical parts, wheels and bearings that need to withstand great forces.
3. Improve wear resistance: brine quenching can increase the wear resistance of the metal, making it more suitable as a surface coating for mechanical parts.
Fourth, salt water quenching precautions
1. Pay attention to safety: the brine quenching process will release a lot of heat, while the brine itself is also irritating, so the operation must pay attention to safety, wear protective gloves and glasses.
2. Choose the right brine: the higher the concentration of salt in the brine, the better the quenching effect, but at the same time, it will increase the risk of metal corrosion. In general, the brine concentration used during quenching should not exceed 10%.
3. Control the cooling speed: the cooling speed of brine quenching is very fast, and too fast cooling will cause the temperature of the metal to change too much, resulting in metal deformation and deformation