TY  - JOUR
A1  - Idir, Abdelhek
A1  - Delloro, Francesco
A1  - Younes, Rassim
A1  - Bradai, Mohand Amokrane
A1  - Sadeddine, Abdelhamid
A1  - Marginean, Gabriela
T1  - Comparative Study of Corrosion Performance of LVOF-Sprayed Ni-Based Composite Coatings Produced Using Standard and Reducing Flame Spray Stoichiometry
T2  - Materials (MDPI)
N2  - Coating efficiency and quality can be significantly improved by carefully optimizing the coating parameters. Particularly in the flame spray method, the oxygen/fuel ratio, which is classified
as oxidizing flame stoichiometry (excess oxygen) and reduces flame stoichiometry (excess acetylene), and spray distance are the most critical factors, as they correlate significantly with coating porosity and corrosion performance. Hence, understanding the effects of these parameters is essential to further minimize the porosity, improving the corrosion performance of thermally sprayed coatings. In this work, a NiWCrBSi alloy coating was deposited via the oxyacetylene flame spray/Flexicord-wire (FS/FC) method. The effect of the flame oxygen/fuel ratio and spray distance on the microstructure properties and corrosion behavior of the coatings was investigated. Afterwards, the microstructure, phases’ compositions, spray distance, and corrosion performance were studied. The equivalent circuit
model was proposed, and the corrosion mechanism was discussed. The obtained results highlight that the oxygen-to-fuel ratio is a promising solution for the further application of flame spray/Flexicordwire (FS/FC) cermet coatings in hostile environments. Depending on the flame’s oxygen/fuel ratio,
careful selection of the flame stoichiometry provides low porosity and high corrosion performance.
KW  - thermal spray; flame stoichiometry; microstructure; porosity; corrosion performance
Y1  - 2024
UR  - https://whge.opus.hbz-nrw.de/frontdoor/index/index/docId/4585
VL  - 17 (2024)
IS  - 2
ER  -