Hot-dip galvanization

Hot-dip galvanization is a metal coating process that involves immersing iron and steel in a bath of molten zinc at a temperature of approximately 449°C (840°F). This process creates a layer of zinc on the metal, which provides protection against corrosion. The zinc coating obtained through hot-dip galvanization offers two anti-corrosion protection mechanisms: the formation of a barrier and cathodic protection.From: Titanic Corrosion [2019], Evaluation of uniformity on zinc-coated (galvanised) steel pipes applied to natural gas installations in civil construction [2022]

The influence of hot dip galvanization to the temperature development of unprotected steel members in fire

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Purchase Book

Published in Alphose Zingoni, Insights and Innovations in Structural Engineering, Mechanics and Computation, 2016

M. Mensinger, C. Gaigl

Hot dip galvanization already constitutes an economic and efficient way to permanently protect steel components from corrosion. It is hence used successfully for many decades, especially in the area of steel building and recently steel bridge construction.

Evaluation of uniformity on zinc-coated (galvanised) steel pipes applied to natural gas installations in civil construction

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Journal Information

Published in Australian Journal of Civil Engineering, 2022

Fernando B. Mainier, Rodolfo Gomes Shamá Dos Santos, Renata Jogaib Mainier

The zinc coating obtained by the hot dip galvanization to protect carbon steel from corrosive medium is based on two anti-corrosion protection mechanisms: the formation of a barrier and cathodic protection. The uniform zinc layer forms a barrier preventing direct contact of the corrosive medium with carbon steel. Figure 3 presents the mechanisms of cathodic protection exerted by the zinc coating and the localised corrosion of carbon steel. In the first case, the zinc coating acts to protect carbon steel by forming a zinc hydroxide, Zn(OH)2, film on the carbon steel surface. However, because it is a thin layer of zinc (50 to 80 µm), it cannot protect the surface of the steel for long. Without the zinc layer, corrosion of carbon steel occurs spontaneously with the formation of a deposit consisting of FeO, Fe(OH)2, and Fe(OH)3. Figure 4 shows in the zinc coating the formation of Zn(OH)2 in white colour and Fe(OH)3 in brown colour representing corrosion of carbon steel.

Hot-dip galvanization

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The influence of hot dip galvanization to the temperature development of unprotected steel members in fire

Evaluation of uniformity on zinc-coated (galvanised) steel pipes applied to natural gas installations in civil construction