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ABSTRACT
Hot-dip galvanizing is one of the most commonly used corrosion protection processes in the world. Its specific qualities come from the metallurgical reaction between zinc and iron during the immersion of the parts in the zinc bath. This reaction does not take place during other zinc coating processes. To achieve the best quality end-product, it is necessary to follow design rules specified in various standards. These rules are detailed in this article, and help answer the most frequent questions about the corrosion protection of structures by hot dip galvanizing.
Read this article from a comprehensive knowledge base, updated and supplemented with articles reviewed by scientific committees.
Read the articleAUTHORS
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GALVAZINC: Association pour le Développement de la Galvanisation à Chaud – ISO 1461
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Marc LAPOINTE: Honorary Chairman - French Painted Steel Technology Association (AFTAP)
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FILIÈRE PEINTURE ANTICORROSION: ACQPA – GEPI – Groupement Anticorrosion du SIPEV – OHGPI
INTRODUCTION
Hot-dip galvanizing is one of the most widely used anti-corrosion processes for steel in the world.
In 2013, around 60% of the 13 million tonnes of zinc produced were used to galvanize steel, significantly extending its service life.
Galvanized steel can be found in all sectors of activity:
building ;
transport ;
energy;
street furniture ;
household and industrial equipment...
The French market, with 600,000 to 800,000 tonnes of hot-dip galvanized steel depending on the year, is Europe's 5th largest galvanizing market; the German market is 1 er with over 2 million tonnes of galvanized steel every year.
The term "hot-dip galvanizing" covers two distinct industrial processes:
Continuous hot-dip galvanizing (of steel coils or wires);
custom hot-dip galvanizing (of finished parts) to standard NF EN ISO 1461 .
Since metal structures are "custom" or "dip" galvanized, we focus here on this single process and its implementation, with the aim of providing users and specifiers with the means to achieve optimum quality.
We begin with a brief overview of the various processes for protecting steel with zinc, followed by a detailed description of the hot-dip galvanizing process, its principle and application.
We then go on to discuss the design, manufacturing, assembly and inspection details required for successful hot-dip galvanizing of steel structures.
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KEYWORDS
galvanization | anticorrosion | galvanic corrosion | corrosion | surface conditioning | zinc
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Hot-dip galvanizing for corrosion protection of metal structures
Different processes for zinc anticorrosion protection of steel
Bibliography
Websites
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IZA (International Zinc Association)
IZA was founded in 1991 by a group of the world's leading zinc producers. Its mission is to collect data, conduct studies and research, and communicate on zinc.
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EGGA (European General Galvanizers Association)
Standards and norms
- Hot-dip galvanizing of finished cast-iron and steel products – Specifications and test methods - NF EN ISO 1461 - juillet 2009
- Zinc coatings – Guidelines and recommendations for corrosion protection of iron and steel in buildings – Part 1: General design principles and corrosion resistance - NF EN ISO 14713-1 - mars 2010
- Steel products – Requirements for hot-dip galvanizing steel components - NF A...
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