How can we solve the problem of missed plating in hot-dip galvanizing?

Incomplete galvanizing is sometimes encountered in hot-dip galvanizing. Here are 10 methods to solve this problem:

1. Strengthen the pre-treatment process for hot-dip galvanizing.

2. Minimize the dwell time in each process step.

3. Ensure the quality concentration and proper ratio of the flux.

4. Prevent the flux from overheating and burning off.

5. Control the aluminum content in the zinc bath to below 0.05%. It is recommended to use an intermediate alloy with 5-10% aluminum content; avoid using pure aluminum ingots directly.

6. Keep the surface of the hot-dip galvanizing solution clean at the workpiece inlet and prevent aluminum accumulation.

7. Avoid over-pickling high-carbon steel.

8. Thoroughly remove weld slag and spatter.

9. Thoroughly remove residual abrasive after grinding away the flame-cut area.

10. Apply a high-concentration solvent beforehand to areas prone to incomplete galvanizing.