Comparative Study of Corrosion Performance of LVOF-Sprayed Ni-Based Composite Coatings Produced Using Standard and Reducing Flame Spray Stoichiometry
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 spr...
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MDPI AG
2024-01-01
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| Online Access: | https://www.mdpi.com/1996-1944/17/2/458 |
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| author | Abdelhek Idir Francesco Delloro Rassim Younes Mohand Amokrane Bradai Abdelhamid Sadeddine Gabriela Marginean |
| author_facet | Abdelhek Idir Francesco Delloro Rassim Younes Mohand Amokrane Bradai Abdelhamid Sadeddine Gabriela Marginean |
| author_sort | Abdelhek Idir |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-08T10:42:22Z |
| format | Article |
| id | doaj.art-888eefb1405f43d1920cf781044d5f4f |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-08T10:42:22Z |
| publishDate | 2024-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-888eefb1405f43d1920cf781044d5f4f2024-01-26T17:29:29ZengMDPI AGMaterials1996-19442024-01-0117245810.3390/ma17020458Comparative Study of Corrosion Performance of LVOF-Sprayed Ni-Based Composite Coatings Produced Using Standard and Reducing Flame Spray StoichiometryAbdelhek Idir0Francesco Delloro1Rassim Younes2Mohand Amokrane Bradai3Abdelhamid Sadeddine4Gabriela Marginean5Laboratory of Mechanics, Materials and Energetic (L2ME), Faculty of Technology, University of Bejaia, Bejaia 06000, AlgeriaMINES ParisTech, PSL Research University, MAT—Centre des Matériaux, CNRS UMR 7633, BP 87, 91003 Evry, FranceLaboratory of Mechanics, Materials and Energetic (L2ME), Faculty of Technology, University of Bejaia, Bejaia 06000, AlgeriaLaboratory of Mechanics, Materials and Energetic (L2ME), Faculty of Technology, University of Bejaia, Bejaia 06000, AlgeriaLaboratory of Mechanics, Materials and Energetic (L2ME), Faculty of Technology, University of Bejaia, Bejaia 06000, AlgeriaInstitute for Mechanical Engineering, Westphalian University of Applied Sciences Gelsenkirchen Bocholt Recklinghausen, Neidenburger Str. 43, 45897 Gelsenkirchen, GermanyCoating 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.https://www.mdpi.com/1996-1944/17/2/458thermal sprayflame stoichiometrymicrostructureporositycorrosion performance |
| spellingShingle | Abdelhek Idir Francesco Delloro Rassim Younes Mohand Amokrane Bradai Abdelhamid Sadeddine Gabriela Marginean Comparative Study of Corrosion Performance of LVOF-Sprayed Ni-Based Composite Coatings Produced Using Standard and Reducing Flame Spray Stoichiometry Materials thermal spray flame stoichiometry microstructure porosity corrosion performance |
| title | Comparative Study of Corrosion Performance of LVOF-Sprayed Ni-Based Composite Coatings Produced Using Standard and Reducing Flame Spray Stoichiometry |
| title_full | Comparative Study of Corrosion Performance of LVOF-Sprayed Ni-Based Composite Coatings Produced Using Standard and Reducing Flame Spray Stoichiometry |
| title_fullStr | Comparative Study of Corrosion Performance of LVOF-Sprayed Ni-Based Composite Coatings Produced Using Standard and Reducing Flame Spray Stoichiometry |
| title_full_unstemmed | Comparative Study of Corrosion Performance of LVOF-Sprayed Ni-Based Composite Coatings Produced Using Standard and Reducing Flame Spray Stoichiometry |
| title_short | Comparative Study of Corrosion Performance of LVOF-Sprayed Ni-Based Composite Coatings Produced Using Standard and Reducing Flame Spray Stoichiometry |
| title_sort | comparative study of corrosion performance of lvof sprayed ni based composite coatings produced using standard and reducing flame spray stoichiometry |
| topic | thermal spray flame stoichiometry microstructure porosity corrosion performance |
| url | https://www.mdpi.com/1996-1944/17/2/458 |
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