Analysis and Control of Typical Surface Defects in Zinc Aluminum Magnesium Motor Shells
A systematic analysis was conducted on three typical surface defects of zinc aluminum magnesium motor shell products:pitting,arc-shaped stripes,and zinc layer cracks.Scanning electron microscopy analysis was performed on the surface and cross-sectional positions to identify the causes of defects and develop improvement measures.The pitting defect is caused by zinc slag,the arc-shaped stripe defect is caused by the turning marks on the surface of the coating roller during the passivation process,forming vertical stripes on the surface of the strip steel,and the zinc layer crack defect is caused by the presence of inclusions in the steel.After implementing improvement measures,the qualification rate of the motor shell has significantly increased.