Comparative Study of Corrosion Performance of LVOF-Sprayed Ni-Based Composite Coatings Produced Using Standard and Reducing Flame Spray Stoichiometry.

Abdelhek Idir, Francesco Delloro, Rassim Younes, Mohand Amokrane Bradai, Abdelhamid Sadeddine, Gabriela Marginean

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Article in Materials (Basel, Switzerland), 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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6 authors.

Abdelhek IdirLaboratory of Mechanics, Materials and Energetic, Faculty of Technology, University of Bejaia, Bejaia 06000, Algeria.ORCID 0000-0001-6895-0772

Francesco DelloroMINES ParisTech, PSL Research University, MAT-Centre des Matériaux, CNRS UMR 7633, BP 87, 91003 Evry, France.ORCID 0000-0002-3068-180X

Rassim YounesLaboratory of Mechanics, Materials and Energetic, Faculty of Technology, University of Bejaia, Bejaia 06000, Algeria.

Mohand Amokrane BradaiLaboratory of Mechanics, Materials and Energetic, Faculty of Technology, University of Bejaia, Bejaia 06000, Algeria.

Abdelhamid SadeddineLaboratory of Mechanics, Materials and Energetic, Faculty of Technology, University of Bejaia, Bejaia 06000, Algeria.

Gabriela MargineanInstitute for Mechanical Engineering, Westphalian University of Applied Sciences Gelsenkirchen Bocholt Recklinghausen, Neidenburger Str. 43, 45897 Gelsenkirchen, Germany.ORCID 0000-0003-1535-666X

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

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/Flexicord-wire (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.

Indexed as

corrosion performanceflame stoichiometrymicrostructureporositythermal spray

Identifiers

PMID38255626

DOI10.3390/ma17020458

PMCPMC10820788

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