Abstract
Electroless nickel-boron coatings were deposited from a novel deposition bath that was stabilizer-free. Those coatings were analyzed by DSC to determine the crystallization temperature of nickel-boride phases, and then the best heat treatment conditions for the new coatings were selected using the Knoop hardness test and XRD. The results of DSC analysis and XRD were coherent with the findings of previous studies, which shows that the new coating has a boron content lower than 4% wt. The maximum hardness was obtained after heat treatment at 300 °C for 4 h and reached 1196 ± 120 hk50, which is much higher than the as-deposited coating. The heat-treated coatings were then fully characterized using optical and scanning electron microscopy, as well tribological and corrosion tests. Various sliding tests (ball-on-disk and ball-on-flat configurations) were conducted to analyze the coefficient of friction (COF) and wear behavior of the coatings. The maximum von Mises stress was calculated, and values of 624 MPa and 728 MPa were obtained for the ball-on-disk and ball-on flat, respectively, at a depth close to 14 µm from the surface, confirming the suitability of the applied load. Abrasive, adhesive, and fatigue wear mechanisms were observed on the worn sample morphology using SEM. It has been determined that during the corrosion test the OCP and corrosion potential values for the heat-treated coating increase as compared with the as-deposited one, whereas its corrosion resistance decreases.
Funder
INTERREG VA program
European Regional Development Fund
Subject
Materials Chemistry,Surfaces, Coatings and Films,Surfaces and Interfaces
Reference53 articles.
1. Synthesis, Characterization and Applications of Electroless Ni-B Coatings—A Review;Shakoor;Int. J. Electrochem. Sci.,2016
2. Effect of Coating Bath Composition on the Properties of Electroless Nickel-Boron Films;Anik;Surf. Coat. Technol.,2008
3. Effect of Heat Treatment on the Corrosion and Mechanical Properties of Electrolytical Composite Ni-B Coatings;Int. J. Electrochem. Sci.,2014
4. Electroless Nickel, Alloy, Composite and Nano Coatings—A Critical Review;Sudagar;J. Alloys Compd.,2013
5. Investigations on the Wear Mechanisms of Electroless Ni-B Coating during Dry Sliding and Endurance Life of the Worn Surfaces;Madah;Surf. Coat. Technol.,2015
Cited by
9 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献