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Comparative Performance of Ni- and Fe-Based Mixed Alloy Brazed Coatings via Laser Remelting

  • Traditionally, repairing coated substrates requires completely removing damaged, wear-resistant layers before recoating. This process leads to high costs, extended downtime, and material waste. Flexible brazing tapes, which are composed of alloy powder and an organic binder, offer an alternative to full coating removal for targeted repairs. Despite this, the process of vacuum brazing these tapes may lead to the formation of defects, including pores caused by trapped gases or residual binder, which compromise coating durability and corrosion resistance. This study focuses on the utilization of laser remelting as a method for post-processing nickel- and iron-based mixed alloy brazing tapes, with the aim of improving the integrity of the coating. Surface quality was assessed via microscopy and microhardness testing by systematically varying laser power, scanning speed, and hatch distance. Among the parameters studied, the most suitable laser parameter combination was found to be 350 W laser power, 250 mm/s scanning speed, and a hatch distance of 0.02 mm. These parameters yielded crack- and pore-free coatings with a remelting depth of 160.3 ± 17.2 µm and a microhardness of 701 ± 23 HV1, which is an 85% increase over as-brazed samples. Wear testing revealed a reduced coefficient of friction, and electrochemical corrosion tests showed lower corrosion current density and enhanced repassivation behavior in remelted coatings. These improvements demonstrate that laser remelting significantly enhances the microstructure, hardness, wear resistance, and corrosion performance of brazed coatings, providing an effective method for localized repair while minimizing material consumption and processing duration.

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Metadaten
Author:Marco BrandORCiD, Mareen GoßlingORCiD, Ion-Dragos UtuORCiD, Gabriela MargineanORCiD
URN:urn:nbn:de:hbz:1010-opus4-49343
DOI:https://doi.org/10.3390/lubricants14040142
Parent Title (English):Lubricants (Special Issue Analysis, Evaluation and Diagnosis of Tribological Phenomena in Machining Processes)
Publisher:MDPI
Document Type:Article
Language:English
Date of Publication (online):2026/03/29
Year of first Publication:2026
Publishing Institution:Westfälische Hochschule Gelsenkirchen Bocholt Recklinghausen
Release Date:2026/03/30
Tag:brazing tapes; corrosion protection; laser surface refining; remelting; repair; reuse; sliding wear resistance
Volume:2026
Issue:14 (4)
Article Number:142
Page Number:19
Institutes:Fachbereiche / Maschinenbau, Umwelt- und Gebäudetechnik
Fachbereiche / Elektrotechnik und angewandte Naturwissenschaften
Dewey Decimal Classification:Technik, Medizin, angewandte Wissenschaften / Industrielle Fertigung / Metallverarbeitung und Rohprodukte aus Metall
Licence (German):Creative Commons - Namensnennung
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