17. October 2023, 16:00 until 17:00

Florian Feldmann, TU Wien, IAP, FB Angewandte Grenzflächenphysik / Dörken Coatings GmbH & Co. KG

Seminar

Characterization of the Galvanic Protection of Zinc Flake Coating by

Spectroelectrochemistry and Industrial Testing

The properties of hot-dip galvanised and electroplated zinc coatings on steel have been widely studied, but the corrosion mechanisms of zinc flake coatings have not yet been investigated in similar detail. Here, we present the protective effect of inorganic lamellar zinc coatings, comparing the metallic dissolution rates of different zinc, aluminium and alloyed flakes using an Inductively Coupled Plasma Mass Spectrometry (ICP- MS) flow cell. These experiments were carried out on both intact and pre-damaged coatings with different electrolytes. Data is also compared to accelerated laboratory corrosion tests and outdoor weathering results. The chloride concentration, and its effect on the passive oxide film, appears to be a key aspect moderating the dissolution rate and hence sacrificial zinc dissolution under various conditions. The complementary use of accelerated tests and ICP-MS flow cell analysis provides new insights into both the influence of the corrosive environment and the impact of the zinc flake (alloy) used. Based on this approach tailored coating solutions using zinc flake coatings can be developed.

Calendar entry

Event location

SEM.R. DB gelb 05 B
1040 Vienna
Wiedner Hauptstraße 8-10/E134

 

Organiser

IAP
Manuela Marik
marik@iap.tuwien.ac.at

 

Public

Yes

 

Entrance fee

No

 

Registration required

No