Figure 5 shows the image of a digital microscope (Keyence VHX-7000 lens VH-Z100R) with a magnification of 1000. Compare the zinc layer between the normal workpiece and the workpiece. As shown in the figure, the zinc surface is smooth, and the zinc thickness is within the control range (controlled at 25 µ m) and the zinc coating. Layer peel off some point.
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