Upward every day - 2010.01.28
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Make progress every day - I hope that participating sea friends can learn from it every day* and progress: What is the effect of surface roughness of hot-rolled steel plates on the corrosion resistance of cathodic electrophoretic coatings? Friends are welcome to actively discuss this topic, so that those who know can learn something new by reviewing the past, and those who don’t know can improve, so as to achieve common learning. * The purpose of common improvement. ＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
1 As the surface roughness of hot-rolled steel plates increases, the corrosion resistance of the coating decreases. When the roughness Ra of the hot-rolled steel plate is 3.4~4.4µm or lower, the corrosion resistance of the coating is equivalent to that of the cold-rolled steel plate coating. ； When the roughness Ra of the hot-rolled steel plate is between 7.0 and 9.0µm, the corrosion resistance of the coating is equivalent to that of the hot-rolled steel plate coating without shot blasting. ； When the roughness Ra of the hot-rolled steel plate is between 9.0 and 12.0µm, the corrosion resistance of the coating is seriously reduced. 2. Adjust the steel shot particle size used for on-site shot blasting (reduced from the original Φ1.0~1.2mm to Φ0.5~0.8mm) to ensure that the coating quality of the workpiece reaches the CA/C202A standard after cathodic electrophoresis. 3. For special workpieces with lower coating standard requirements, whether to use the shot blasting process can be determined based on the oxide scale state on the surface of the workpiece. If the oxide scale on the surface of the workpiece is not destroyed, the shot blasting process can be cancelled. ； At present, the longitudinal beams and reinforcing plates, cross beams and connecting plates, and some brackets of the Jiefang truck frame assembly are damaged by the oxide scale, and the shot blasting process must be used before painting.
1 As the surface roughness of hot-rolled steel plates increases, the corrosion resistance of the coating decreases. When the roughness Ra of the hot-rolled steel plate is 3.4~4.4µm or lower, the corrosion resistance of the coating is equivalent to that of the cold-rolled steel plate coating. ； When the roughness Ra of the hot-rolled steel plate is between 7.0 and 9.0µm, the corrosion resistance of the coating is equivalent to that of the hot-rolled steel plate coating without shot blasting. ； When the roughness Ra of the hot-rolled steel plate is between 9.0 and 12.0µm, the corrosion resistance of the coating is seriously reduced. 2. Adjust the steel shot particle size used for on-site shot blasting (reduced from the original Φ1.0~1.2mm to Φ0.5~0.8mm) to ensure that the coating quality of the workpiece reaches the CA/C202A standard after cathodic electrophoresis. 3. For special workpieces with lower coating standard requirements, whether to use the shot blasting process can be determined based on the oxide scale state on the surface of the workpiece. If the oxide scale on the surface of the workpiece is not destroyed, the shot blasting process can be cancelled. ； At present, the longitudinal beams and reinforcing plates, cross beams and connecting plates, and some brackets of the Jiefang truck frame assembly are damaged by the oxide scale, and the shot blasting process must be used before painting.
1 As the surface roughness of hot-rolled steel plates increases, the corrosion resistance of the coating decreases. When the roughness Ra of the hot-rolled steel plate is 3.4~4.4µm or lower, the corrosion resistance of the coating is equivalent to that of the cold-rolled steel plate coating. ； When the roughness Ra of the hot-rolled steel plate is between 7.0 and 9.0µm, the corrosion resistance of the coating is equivalent to that of the hot-rolled steel plate coating without shot blasting. ； When the roughness Ra of the hot-rolled steel plate is between 9.0 and 12.0µm, the corrosion resistance of the coating is seriously reduced. 2. Adjust the steel shot particle size used for on-site shot blasting (reduced from the original Φ1.0~1.2mm to Φ0.5~0.8mm) to ensure that the coating quality of the workpiece reaches the CA/C202A standard after cathodic electrophoresis. 3. For special workpieces with lower coating standard requirements, whether to use the shot blasting process can be determined based on the oxide scale state on the surface of the workpiece. If the oxide scale on the surface of the workpiece is not destroyed, the shot blasting process can be cancelled. ； At present, the longitudinal beams and reinforcing plates, cross beams and connecting plates, and some brackets of the Jiefang truck frame assembly are damaged by the oxide scale, and the shot blasting process must be used before painting.
1 As the surface roughness of hot-rolled steel plates increases, the corrosion resistance of the coating decreases. When the roughness Ra of the hot-rolled steel plate is 3.4~4.4µm or lower, the corrosion resistance of the coating is equivalent to that of the cold-rolled steel plate coating. ； When the roughness Ra of the hot-rolled steel plate is between 7.0 and 9.0µm, the corrosion resistance of the coating is equivalent to that of the hot-rolled steel plate coating without shot blasting. ； When the roughness Ra of the hot-rolled steel plate is between 9.0 and 12.0µm, the corrosion resistance of the coating is seriously reduced. 2. Adjust the steel shot particle size used for on-site shot blasting (reduced from the original Φ1.0~1.2mm to Φ0.5~0.8mm) to ensure that the coating quality of the workpiece reaches the CA/C202A standard after cathodic electrophoresis. 3. For special workpieces with lower coating standard requirements, whether to use the shot blasting process can be determined based on the oxide scale state on the surface of the workpiece. If the oxide scale on the surface of the workpiece is not destroyed, the shot blasting process can be cancelled. ； At present, the longitudinal beams and reinforcing plates, cross beams and connecting plates, and some brackets of the Jiefang truck frame assembly are damaged by the oxide scale, and the shot blasting process must be used before painting.
1 As the surface roughness of hot-rolled steel plates increases, the corrosion resistance of the coating decreases. When the roughness Ra of the hot-rolled steel plate is 3.4~4.4µm or lower, the corrosion resistance of the coating is equivalent to that of the cold-rolled steel plate coating. ； When the roughness Ra of the hot-rolled steel plate is between 7.0 and 9.0µm, the corrosion resistance of the coating is equivalent to that of the hot-rolled steel plate coating without shot blasting. ； When the roughness Ra of the hot-rolled steel plate is between 9.0 and 12.0µm, the corrosion resistance of the coating is seriously reduced. 2. Adjust the steel shot particle size used for on-site shot blasting (reduced from the original Φ1.0~1.2mm to Φ0.5~0.8mm) to ensure that the coating quality of the workpiece reaches the CA/C202A standard after cathodic electrophoresis. 3. For special workpieces with lower coating standard requirements, whether to use the shot blasting process can be determined based on the oxide scale state on the surface of the workpiece. If the oxide scale on the surface of the workpiece is not destroyed, the shot blasting process can be cancelled.
As the surface roughness of hot-rolled steel plates increases, the corrosion resistance of the coating decreases. When the roughness Ra of the hot-rolled steel plate is 3.4~4.4µm or lower, the corrosion resistance of the coating is equivalent to that of the cold-rolled steel plate coating. ； When the roughness Ra of the hot-rolled steel plate is between 7.0 and 9.0µm, the corrosion resistance of the coating is equivalent to that of the hot-rolled steel plate coating without shot blasting. ； When the roughness Ra of the hot-rolled steel plate is between 9.0 and 12.0µm, the corrosion resistance of the coating is seriously reduced. Adjusting the steel shot particle size used for on-site shot blasting (reducing from the original Φ1.0~1.2mm to Φ0.5~0.8mm) can ensure that the coating quality of the workpiece reaches the CA/C202A standard after cathodic electrophoresis. For special workpieces with lower coating standard requirements, whether to use the shot blasting process can be determined based on the oxide scale state on the surface of the workpiece. If the oxide scale on the surface of the workpiece is not destroyed, the shot blasting process can be cancelled. ； At present, the longitudinal beams and reinforcing plates, cross beams and connecting plates, and some brackets of the Jiefang truck frame assembly are damaged by the oxide scale, and the shot blasting process must be used before painting.
1 As the surface roughness of hot-rolled steel plates increases, the corrosion resistance of the coating decreases. When the roughness Ra of the hot-rolled steel plate is 3.4~4.4µm or lower, the corrosion resistance of the coating is equivalent to that of the cold-rolled steel plate coating. ； When the roughness Ra of the hot-rolled steel plate is between 7.0 and 9.0µm, the corrosion resistance of the coating is equivalent to that of the hot-rolled steel plate coating without shot blasting. ； When the roughness Ra of the hot-rolled steel plate is between 9.0 and 12.0µm, the corrosion resistance of the coating is seriously reduced. 2 Adjusting the steel shot particle size used for on-site shot blasting (reducing from the original Φ1.0~1.2mm to Φ0.5~0.8mm) can ensure that the coating quality of the workpiece reaches the CA/C202A standard after cathodic electrophoresis. 3 For special workpieces with lower coating standard requirements, whether to use the shot blasting process can be decided based on the oxide scale state on the surface of the workpiece. If the oxide scale on the surface of the workpiece is not destroyed, the shot blasting process can be cancelled.
1 As the surface roughness of hot-rolled steel plates increases, the corrosion resistance of the coating decreases. When the roughness Ra of the hot-rolled steel plate is 3.4~4.4µm or lower, the corrosion resistance of the coating is equivalent to that of the cold-rolled steel plate coating. ； When the roughness Ra of the hot-rolled steel plate is between 7.0 and 9.0µm, the corrosion resistance of the coating is equivalent to that of the hot-rolled steel plate coating without shot blasting. ； When the roughness Ra of the hot-rolled steel plate is between 9.0 and 12.0µm, the corrosion resistance of the coating is seriously reduced. 2. Adjust the steel shot particle size used for on-site shot blasting (reduced from the original Φ1.0~1.2mm to Φ0.5~0.8mm) to ensure that the coating quality of the workpiece reaches the CA/C202A standard after cathodic electrophoresis. 3. For special workpieces with lower coating standard requirements, whether to use the shot blasting process can be determined based on the oxide scale state on the surface of the workpiece. If the oxide scale on the surface of the workpiece is not destroyed, the shot blasting process can be cancelled. ； At present, the longitudinal beams and reinforcing plates, cross beams and connecting plates, and some brackets of the Jiefang truck frame assembly are damaged by the oxide scale, and the shot blasting process must be used before painting.
As the surface roughness of hot-rolled steel plates increases, the corrosion resistance of the coating decreases. When the roughness Ra of the hot-rolled steel plate is 3.4~4.4µm or lower, the corrosion resistance of the coating is equivalent to that of the cold-rolled steel plate coating. ； When the roughness Ra of the hot-rolled steel plate is between 7.0 and 9.0µm, the corrosion resistance of the coating is equivalent to that of the hot-rolled steel plate coating without shot blasting. ； When the roughness Ra of the hot-rolled steel plate is between 9.0 and 12.0µm, the corrosion resistance of the coating is seriously reduced.