A Guide to Galvanizing

PRE-GALVANIZING CONSIDERATIONS

The entire galvanizing process consists of different steps, from the loading, pre-treatment to the zinc bath submersion. There are some considerations to take note of before sending materials for galvanizing to ensure that the galvanizing coating will be of top quality.

1. Draining / Vent holes

WHY IS IT IMPORTANT?

These holes are important for:

1. Submersion of materials into the tank

2. Draining time to allow fluids to flow in and out quickly and steadily

3. Safety- Prevention of explosions in the galvanizing tank

*GUIDE IS NOT EXHAUSTIVE

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2. Cropped corners / Notches

WHY IS IT IMPORTANT?

These notches are important for:

1. Smooth draining time to allow fluids to flow in and out quickly and steadily

2. Minimize accumulation of ash

*GUIDE IS NOT EXHAUSTIVE

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3. Lifting, Hooking points

WHY IS IT IMPORTANT?

These points are important for:

1. For the loading of the materials on jigs

2. Proper angle for good draining time to allow fluids to flow in and out quickly and steadily

4. MATERIAL CONDITION (RUSTY, OILY, PAINTED, LACQUERED) 

RUSTY, OILY, PAINTED, LACQUERED

Why are such conditions a problem?

The regular washing process in galvanizing is unable to wash such coatings, resulting in:

i. Uncoated areas

ii. Surface roughness
iii. Peeling galvanized coatings

Such materials are advised to undergo special pre-treatment such as sandblasting

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