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Why is a clean surface necessary?
Hot-dip galvanizing requires suitable surface preparation so that zinc can react with steel. Oil, oxides and fabrication residues are part of that assessment. Describing the condition of incoming material helps the plant plan preparation. A newly fabricated component is not automatically ready, because it may still carry marking paint or welding residues.
Identify fabrication residues in advance
Weld slag, silicone-containing products and some paint residues may not be fully removed by routine chemical preparation. Share details of welding aids and surface markers with the technical team. Agree during quotation which cleaning work belongs to the fabricator and which will be performed at the plant. This is particularly useful for multi-component orders.
A practical pre-delivery check
Update the component list, inspect surfaces and photograph visible residues. Identify previously coated, painted or used components separately from new steel. Show openings in hollow sections and areas that are difficult to access. This helps preparation needs become visible before delivery day, allowing galvanizing to be planned around the actual condition of the material.
Different surface conditions in one order
An order may contain new sections, previously painted parts and welded fabrications. Their preparation requirements should not be assumed identical. Group components by current surface condition as well as dimensions. Photographs should show connections, weld surroundings and marking residues. Clearly state when previous treatments are unknown. This simple classification before shipment helps identify preparation scope and further inspection needs early. Final processing decisions are confirmed during material acceptance.