Food-grade 25L Inner Coating Drum 50L Iron Drum Conical Steel Plastic Drum Sealed Turnover Drum Manufacturer
observational check
visualization
Check the surface under natural light or white light illumination, and the normal antirust layer should be evenly covered, without missing coating, peeling or obvious color difference.
The galvanized bucket shall be confirmed that the zinc layer has no black spots, white rust or scratches (black spots may be caused by impurities or poor passivation of the zinc layer).
Wipe test
Wipe the surface with a clean white cloth. If there is obvious rust or the coating falls off, it indicates that the antirust layer is invalid.
Second, the thickness and adhesion detection
Galvanized layer thickness
Using magnetic thickness gauge to measure the thickness of zinc layer conforms to GB/T 13912-2022 standard (for example, if the thickness of substrate is ≥6mm, the average thickness should be ≥ 80μ m).
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