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gepostet am 29.05.19
How is Black Spot of Color Sheet Formed
How is Black Spot of Color Sheet Formed
When customers find the existence of black spots in the use of color coated coils and China color-coated corrugated roofing sheet, they will raise quality objections in response. In general, the explanation of steel mills is the friction black spots caused by transportation problems. So what characteristics should we use to determine whether it is a friction black spot? Below is the friction black spot occurrence occasion, characteristics, and reasons for the majority of users reference.

One, the black spot defect occurrence occasion
Defects in the production process of steel products, such as indentation, roller printing, scratches and so on, can be found in time in the field of production, steel can be quickly eliminated by taking measures. There is also a kind of defects, field production is not easy to find in time or can not be found, only when the customer used to open the book to find, such as China high quality prepainted color galvanized coil of black spots and galvanized roll of black spots. Such defects will affect the surface quality of deep processing of subsequent processes to varying degrees. In addition, it is found that there is lag time, so it cannot be blocked in time, resulting in delivery fact of the factory and corresponding customer complaints. Defects such as color - coated, fingerprint - resistant or zinc - plated sheets are easy to occur. How and what are the characteristics of such defects? Read on.

Second, the black spot defect characteristics
Friction black spot more occurred on both sides of the width of galvanized coil, the color black, the corresponding position of the upper and lower surface are present; The defect occurs at the corresponding position of each lap, and the number of laps is usually as few as 7 to 8, and more than 1/3 of the total length of the coil.

Three, friction black spot defect causes
We can see according to the defect characteristics, basically, the defect occurred in the two sides of the hot sale galvanized steel coil, a black strip of a spot, the upper and lower surface is corresponding. Basically every coil, the coil is in a fixed position along the diameter. Normally at six o 'clock, right under the coil, on both sides. This position is usually filled with something, so the force is relatively large, easy to be subjected to hot friction, the temperature rise is relatively fast, passivation film or zinc layer is easy to be destroyed, after oxidation, it will be black, the defect of friction black spot. Defects such as these can be judged as defects in transport.
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