Title :

Surface characterization of Fe-Cr-Ni-Si-P coatings resistant to wetting and liquid zinc corrosion during batch hot-dip galvanizing

Author(s) :

Cieplak, Aleksandra [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Portebois, Léo [Auteur]
Comte, Richard [Auteur]
Proriol Serre, Ingrid [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Balloy, David [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]

Conference title :

EUROCOR 2024

City :

Paris

Country :

France

Start date of the conference :

2024-09

HAL domain(s) :

Chimie/Matériaux
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]

English abstract : [en]

Hot-dip galvanizing enhances steel corrosion resistance through the formation of protective zinc coatings. In batch galvanizing, steel parts are coated with zinc after several surface preparation stages. Steel hangers move ...
Show more >Hot-dip galvanizing enhances steel corrosion resistance through the formation of protective zinc coatings. In batch galvanizing, steel parts are coated with zinc after several surface preparation stages. Steel hangers move the components from one bath to another, where they experience the same treatment and react with zinc, but cyclically. It's also necessary to clean the hangers in HCl in between galvanizing cycles. This process results in chemical waste, excessive consumption of zinc, and hangers' weight loss due to the formation and subsequent dissolution of Fe-Zn intermetallics. To address this, we aim to develop a zinc-resistant hanger material, focusing on SiO2's potential to reduce wetting and zinc use in the galvanizing process. Fe-Cr-Ni-Si-P coatings produced through the slurry process have a multiphase, complex microstructure consisting primarily of Cr- and P-rich phases scattered throughout a matrix of Ni- and Si-rich phases. Cyclic galvanizing tests revealed that those coatings decreased liquid zinc corrosion by 81% after 20 cycles, in comparison to the low-carbon DD13 steel. The wetting is also significantly reduced, with 85% less zinc consumed after 20 cycles for coated samples. This presentation will be centered around SEM-EDX surface analysis of samples at different stages of galvanizing treatment. They reveal that the P-rich phases are resistant to liquid zinc corrosion, whereas the matrix forms rare Fe-Zn intermetallics. At the same time, the matrix is responsible for the creation of a thin layer of protective oxides that reduce the wetting by liquid zinc. These coatings present a real interest for their application in batch galvanizing sites in order to increase production productivity and decrease waste since the slurry process can be adapted to parts of different sizes and geometries.Show less >

Language :

Anglais

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
CNRS
INRAE
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Research team(s) :

Métallurgie Physique et Génie des Matériaux

Submission date :

2024-09-05T12:40:46Z
2024-09-06T07:47:27Z
2024-09-17T12:55:50Z