01High point
Vent enclosed volumes
Open every sealed or partly enclosed section so trapped air and moisture can escape safely.
Galvanized steel parts ready for outdoor service.
Add galvanizing to an eligible steel part and review venting, drainage, coating build and functional fits before it enters production.
ImmersionAccessible interior and exterior steel surfaces
Bonded zincMetallurgical coating formed with the substrate
Vent + drainOpenings are essential for safe free flow
Variable appearanceSteel chemistry and geometry affect the finish
Order the protection with the steel geometry.
Metalldel reviews the eligible steel part as a complete fabrication before galvanizing is accepted. Hollow sections, pockets, overlaps and handling orientation must let air escape and process liquids and zinc drain freely.
Threads, close fits and moving interfaces are identified in the same order so coating build is considered before delivery rather than corrected after assembly.
Never submit a sealed hollow fabrication for galvanizing. Vent and drain details must be reviewed before production.
Design for the direction the part enters and leaves the zinc bath.
02Low point
Drain every pocket
Place generous openings near low points so cleaning solutions and molten zinc leave the fabrication.
03Flow path
Avoid tight overlaps
Overlapping surfaces can trap liquid and may require seal welding, spacing or another detail agreed with the galvanizer.
04Handling
Plan lifting orientation
Hanging points and immersion angle influence drainage, marks, access and the visible finish.
Available materials for galvanizing.
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Final acceptance also depends on fabrication, venting, drainage and handling orientation.
Allow for coating build on finished interfaces.
Fit
Threads and holes
Internal threads and close-clearance holes may need oversizing, masking or post-process treatment agreed in advance.
Movement
Moving interfaces
Hinges, sliding faces and mating components need clearance for coating build and possible zinc accumulation.
Natural finish
Appearance
Spangle, gloss, colour variation, runs and handling marks vary with steel chemistry, surface and geometry.
A galvanizing sequence built around free flow and safe handling.
Review the fabrication
Check steel grade, dimensions, hollow sections, overlaps, fit and handling points.
Confirm venting and drainage
Approve openings and orientation before the fabrication is released.
Clean, flux and immerse
Prepare the steel and dip it so zinc reaches and drains from accessible surfaces.
Inspect and finish
Review coverage and agreed acceptance requirements before packing or subsequent work.
Preparing a part for galvanizing
Which parts are eligible for galvanizing?
This service is for eligible steel parts and fabrications. Material, geometry, drainage and handling are reviewed before acceptance.
Where are vent and drain holes required?
Every enclosed or overlapping volume needs safe flow for air, cleaning liquids and molten zinc. Submit the complete geometry for review.
How should threaded holes be handled?
Identify every functional thread and close fit so oversizing, masking or post-process treatment can be agreed before production.
Will the finish look perfectly uniform?
Not always. Steel chemistry, surface condition and geometry affect brightness and texture, so functional and cosmetic requirements should be stated separately.
Design the steel so zinc can reach, protect and leave every surface.
Configure an eligible part or send the fabrication drawing for vent, drain and fit review.