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http://hdl.handle.net/10553/118835
Title: | Hot-Corrosion and Particle Erosion Resistance of Co-Based Brazed Alloy Coatings | Authors: | Utu, ID Hulka, Iosif Kazamer, N Constantin, AT Marginean, G |
UNESCO Clasification: | 330307 Tecnología de la corrosión | Keywords: | co-based alloys hot corrosion solid particle erosion microstructure brazing |
Issue Date: | 2022 | Journal: | Crystals | Abstract: | Tape brazing constitutes a cost-effective alternative surface protection technology for complex-shaped surfaces. The study explores the characteristics of high-temperature brazed coatings using a cobalt-based powder deposited on a stainless-steel substrate in order to protect parts subjected to hot temperatures in a wear-exposed environment. Microstructural imaging corroborated with x-ray diffraction analysis showed a complex phased structure consisting of intermetallic Cr-Ni, C-Co-W Laves type, and chromium carbide phases. The surface properties of the coatings, targeting hot corrosion behavior, erosion, wear resistance, and microhardness, were evaluated. The high-temperature corrosion test was performed for 100 h at 750◦C in a salt mixture consisting of 25 wt.% NaCl + 75 wt.% Na2SO4 . The degree of corrosion attack was closely connected with the exposure temperature, and the degradation of the material corresponding to the mechanisms of low-temperature hot corrosion. The erosion tests were carried out using alumina particles at a 90◦ impingement angle. The results, correlated with the microhardness measurements, have shown that Co-based coatings exhibited approximately 40% lower material loss compared to that of the steel substrate. | URI: | http://hdl.handle.net/10553/118835 | ISSN: | 2073-4352 | DOI: | 10.3390/cryst12060762 |
Appears in Collections: | Artículos |
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