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The International and European Standard for Batch Hot Dip Galvanizing – EN ISO 1461
Batch galvanizing of steel structures and components is easily specified using EN ISO 1461:2009 ‘Hot dip galvanized coatings on fabricated iron and steel articles — Specifications and test methods’.
The standard defines requirements for coating thickness and other characteristics. It also provides useful information on how to order steelwork to be galvanized and the information required to be exchanged between galvanizer and purchaser to ensure the specification can be carried out optimally
Guidance on Design and Specification of Articles to be Batch Hot Dip Galvanized – EN ISO 14713-2
EN ISO 14713-2: 2019 ‘Guidelines and recommendations for the protection against corrosion of iron and steel in structures — Zinc coatings — Part 2: Hot dip galvanizing’ gives guidance for engineers and steel fabricators to ensure that steelwork is properly designed to be safely and efficiently hot dip galvanized. Detailed information is provided on the provisions for venting and draining of components in a way that ensures escape of air and access for molten zinc. Attention to these simple details ensures complete coverage of the coating and, importantly, prevents explosion risks during processing.
Guidance on the Durability and Life Expectancy of Batch Hot Dip Galvanized Coatings – EN ISO 14713-1
EN ISO 14713-1: 2017 ‘Guidelines and recommendations for the protection against corrosion of iron and steel in structures — Zinc coatings — Part 1: General principles of design and corrosion resistance’ contains valuable information on the life expectancy of galvanized coatings – including conservative predictions based on first-year zinc corrosion rates derived from ISO 9223’s classification of atmospheric corrosivity (note that more realistic, longer-term, corrosion rates are given in ISO 9224). EN ISO 14713-1 also provides information on corrosion performance of zinc coatings in other exposure situations, including in soils, water and in contact with other materials
ASTM A123
Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel
Products covers the requirements for galvanizing by the hot-dip process on iron and steel products made from rolled, pressed, and forged shapes, castings, plates, bars, and strips. It covers both un-fabricated products and fabricated products, for example, assembled steel products, structural steel fabrications, large tubes already bent or welded before galvanizing, and wire work fabricated from uncoated steel wire. This specification also covers steel forgings and iron castings incorporated into pieces fabricated before galvanizing or which are too large to be centrifuged (or otherwise handled to remove excess galvanizing bath metal). ASTM A123 does not apply to wire, pipe, tube, or steel sheet which is galvanized on specialized or continuous lines. The specification includes minimum coating thicknesses according to material category as well as finish and adherence requirements.
ASTM A153
Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware
covers zinc coatings applied by the hot-dip process on iron and steel hardware. It is intended to be applicable to hardware items that are centrifuged or otherwise handled to remove excess zinc. ASTM A153 also contains information on minimum coating thickness as well as finish and adherence requirements.
ASTM A385/A385 M
Practice for Providing High-Quality Zinc Coatings (Hot-Dip)
Provides details on steel selection and other design practices such as venting and draining, welding, etc. to ensure the best quality product after galvanizing. Assemblies should consist of elements of similar chemistry and surface condition. Whenever different analyses of steel or different surfaces of steel are united in an assembly the galvanized finish is not generally uniform in appearance. All fabricated assemblies shall be designed with vent and drain holes such that no air is trapped during immersion of the assemblies into cleaning solutions or molten zinc.
ASTM B6
Specification for Zinc
This specification covers zinc metal made from ore or other material by a process of distillation or by electrolysis in five grades as follows: LME grade, special high grade, high grade, intermediate grade, and prime western grade.