Hot-Dip Galvanized Specification

Hot‑Dip Galvanizing — ISO 1461:2022 Standard

Hot‑dip galvanizing is a proven, long‑term corrosion‑protection system for steel, defined by ISO 1461:2022 – Hot‑dip galvanized coatings on iron and steel articles: Specifications and test methods. The standard covers every stage of the process, from cleaning and pre‑treatment through to full immersion in molten zinc, ensuring a consistently bonded, high‑performance coating.

For marine or highly aggressive environments, a higher coating thickness can be achieved by shot blasting the steel prior to galvanizing, allowing a thicker zinc–iron alloy layer to form.

 

Technical Applicator Requirements

The following conditions are essential for hot‑dip galvanizing to be applied effectively and efficiently — all of which are met across the products we supply:

  • Galvanizing must be carried out in accordance with ISO 1461:2022.

  • A robust quality management system audited annually to BS EN ISO 1461:2022 (or equivalent) must be in place.

  • Full component traceability must be maintained throughout the process.

  • Post‑galvanizing inspection must confirm minimum coating thickness and address any surface defects, including the repair of allowable bare patches using ISO 1461:2022 procedures.

  • Materials must be suitably packaged prior to despatch to prevent transit damage.

  • The galvanizer should be a member of the Galvanizers Association, ensuring access to independent technical guidance for specifiers.

Onsite Handling & Protection

  • Handle and install galvanized steel carefully to avoid impact damage.

  • Protect materials stored on site from contamination or abrasion.

  • Avoid white rust by ensuring stacked galvanized items are separated with spacers or stored indoors if kept for more than three weeks.

  • Covering galvanized steel can increase sweating, raising the risk of white rust formation.

 

Hot‑Dip Galvanizing Attributes

  • Coating applied to all surfaces — internal and external.

  • Superior corrosion protection for exposed or external steel.

  • Non‑permeable, abrasion‑resistant coating with alloy layers harder than steel.

  • Sacrificial (cathodic) protection built into the coating.

  • Exceptional edge protection compared to paint systems.

  • Factory‑controlled process delivering a repeatable, high‑quality finish.

  • On‑site welding compatible, with repairs carried out using ISO 1461:2022‑approved methods.