Autor(en): Tillmann, Wolfgang
Abdulgader, Mohamed
Wirtz, Andreas
Milz, Michael P.
Biermann, Dirk
Walther, Frank
Titel: The effect of argon as atomization gas on the microstructure, machine hammer peening post-treatment, and corrosion behavior of twin wire arc sprayed (TWAS) ZnAl4 coatings
Sprache (ISO): en
Zusammenfassung: In the twin wire arc spraying (TWAS) process, it is common to use compressed air as atomizing gas. Nitrogen or argon also are used to reduce oxidation and improve coating performance. The heat required to melt the feedstock material depends on the electrical conductivity of the wires used and the ionization energy of both the feedstock material and atomization gas. In the case of ZnAl4, no phase changes were recorded in the obtained coatings by using either compressed air or argon as atomization gas. This fact has led to the assumption that the melting behavior of ZnAl4 with its low melting and evaporating temperature is different from materials with a higher melting point, such as Fe and Ni, which also explains the unexpected compressive residual stresses in the as-sprayed conditions. The heavier atomization gas, argon, led to slightly higher compressive stresses and oxide content. Compressed air as atomization gas led to lower porosity, decreased surface roughness, and better corrosion resistance. In the case of argon, Al precipitated in the form of small particles. The post-treatment machine hammer peening (MHP) has induced horizontal cracks in compressed air sprayed coatings. These cracks were mainly initiated in the oxidized Al phase.
Schlagwörter: Twin wire arc spraying process
Atomization gas
Argon
ZnAl4 coatings
Oxidation
Machine hammer peening
Corrosion behavior
Schlagwörter (RSWK): Thermisches Spritzen
Gaszerstäubung
Argon
Aluminiumlegierung
Zink
Oxidation
Maschinelles Oberflächenhämmern
Korrosion
Beschichtung
URI: http://hdl.handle.net/2003/40685
http://dx.doi.org/10.17877/DE290R-22543
Erscheinungsdatum: 2021-12-27
Rechte (Link): https://creativecommons.org/licenses/by/4.0/
Enthalten in den Sammlungen:Lehrstuhl für Werkstofftechnologie

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