Will the surface roughness change after blackening of steel?

The surface roughness of steel may change after blackening treatment, depending on the blackening treatment method and treatment conditions used. The following are some factors that may lead to changes in surface roughness:

1. Treatment method: Different blackening treatment methods may produce different surface effects. Some treatment methods may cause the surface to become rougher, while other methods may make the surface smooth or produce micro-bumps.

2. Treatment process: Blackening treatment usually involves corrosion or oxidation treatment of metal surface. These treatments may lead to the removal or transformation of metal surface substances to a certain extent, thus affecting the surface roughness.

3. Treatment conditions: Treatment conditions such as treatment time, temperature and solution concentration may also affect the change of surface roughness. Different treatment conditions may lead to different degrees of surface corrosion or oxidation, and then affect the surface roughness.

Therefore, when blackening steel, if there are specific requirements for surface roughness, appropriate treatment methods should be selected and treatment conditions should be strictly controlled. In addition, if it is necessary to achieve a specific surface roughness level, further processing or polishing steps may be needed to adjust the surface quality.

How to check the surface roughness?

An instrument for checking surface roughness, just like a rigorous quality inspector, makes a meticulous inspection of the appearance of the workpiece to judge whether its surface roughness meets the standard. The measuring principles of this kind of instruments are varied, like doctors’ diagnosis, such as touching needles, light cutting, interference and so on, and each method has its own unique diagnostic method.

Among them, the touch needle method is like a careful craftsman, sliding on the surface of the workpiece with a delicate needle, and depicting the true face of surface roughness by sensing the height difference between peaks and valleys. The optical tangent method is like a magician who is good at optical magic. With the help of optical principle, it induces the light reflected from the surface of the workpiece to interfere, and accurately calculates the surface roughness by calculating the number of interference fringes.

The roughness instrument not only acts as a quality inspector, but also provides a “full-body photo” of the workpiece surface, so that we can see all the features of the workpiece surface clearly. It is like an all-round information provider, which involves almost all fields in the manufacturing process, whether it is mechanical manufacturing, aerospace or automobile manufacturing, or even medical field, and it is active.

With its help, we can accurately measure and control the surface of the workpiece to ensure that each workpiece can achieve the preset quality and performance. In addition, it often provides us with many other valuable information, such as the smoothness of the workpiece, whether there are defects on the surface, machining marks and so on. This information is like a mirror, reflecting the problems existing in the manufacturing process, so that we can find out and solve these problems in time, further optimize the manufacturing process and improve efficiency.

Generally speaking, roughness instrument plays an important role in the manufacturing field, which provides so much valuable information that we can better understand and control the manufacturing process. Therefore, we should pay attention to the application and development of roughness instruments to improve the quality and efficiency of manufacturing engineering.

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