Hot-Dip Galvanizing Process
A tested and proven galvanizing process ideal for modern applications
AZZ’s GalvXtra galvanizing process uses a proprietary formulation of molten metals that produces the most consistent coating thickness available while also creating an even, enduring finish. Part of a four-step, hot-dip galvanizing process, GalvXtra meets ASTM A123, ASTM A153, and ASTM B6 requirements to deliver high-quality zinc coatings on ferrous materials.
Steel arriving at AZZ’s galvanizing plant undergoes a thorough inspection to ensure drainage and venting requirements are met. Once in the staging area, careful handling ensures the material is transported efficiently and effectively through the initial cleaning process.
A critical part of the process is cleaning, which begins with a complete immersion in a hot alkali solution, to remove organic compounds and dirt. Next acid pickling removes rust or scale and finally fluxing eliminates surface oxides to promote intermetallic development.
The steel is submerged in a bath of molten zinc until it reaches 840° F (449° C). At this point, the zinc reacts with the steel to form zinc/iron intermetallic layers on all surfaces inside and out.
Post-dip quality inspection
The galvanized steel is cleaned, weighed, and carefully inspected. Calibrated instrumentation ensures quality standards are met and coating thickness, appearance, and compliance with ASTM specifications are all reviewed before final approval. Once completed, the galvanized product is ready to be shipped. AZZ can assist you with your transportation requirements.
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All commonly practiced welding and cutting techniques can be used on galvanized steel (see American Welding Society’s [AWS] specification D – 19.0, Welding Zinc-Coated Steel). Welding on galvanized steel is usually necessary if the final structure is too large to be dipped in a galvanizing bath or for structures that must be welded in the field.