Developments in laser-based surface engineering processes: with particular reference to protection against cavitation erosion

Kwok, Chi Tat; Man, Hau Chung; Cheng, F. T.; Lo, K.H.

doi:10.1016/j.surfcoat.2016.02.019

Cited by 108 publications

(38 citation statements)

References 95 publications

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“…Laser cladding is a new type of surface modification technology through which the alloy powder can be rapidly melted on the surface of the substrate under the action of a laser, and quickly combined with the substrate to form a coating [1,2]. Because this technology can make the surface have excellent wear resistance, corrosion resistance and oxidation resistance, the surface modification of laser cladding has been developed rapidly, manifested in the use of various alloy powders for surface modification [3,4]. For example, cobalt-based, nickel-based and iron-based powders have been widely used in the research and commercial use of surface modification of 316 stainless steel [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Effect of process parameters and niobium carbide addition on microstructure and wear resistance of laser cladding nickel‐based alloy coatings

Yufan

Ping

et al. 2020

Materialwissenschaft Werkst

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Based on the background of the engineering application of automobile mold repair and surface strengthening, the effects of process parameters on the formation and microstructure of laser cladding nickel(Ni)‐based alloy coating were studied. The optimal parameters were: laser power 2000 W, powder feeding rate 15 g/min, scanning speed 4 mm/s. Under this process, the cladding layer and the substrate can exhibit good metallurgical bonding, and the cladding layer has fine crystal grains and a low dilution ratio. On this basis, different mass fractions of niobium carbide (NbC) powder were added to the nickel‐based powder and laser cladding was carried out on the surface of die steel. The phase composition, microstructure, hardness and wear resistance of the coating were studied. The results show that with the increasing of niobium carbide addition, the hardness of the cladding layer decreases, and the wear loss of the cladding layer decreases first and then increases. When the niobium carbide addition reaches 6 wt.%, the wear loss of the cladding layer is the least, and the wear resistance is the best.

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Section: Introductionmentioning

confidence: 99%

Effect of process parameters and niobium carbide addition on microstructure and wear resistance of laser cladding nickel‐based alloy coatings

Yufan

Ping

et al. 2020

Materialwissenschaft Werkst

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“…In recent years, lasers have been increasingly used in the processing of metals. Lasers can be used for cutting, drilling, marking, engraving, cleaning, welding and other operations [5][6][7][8][9]. The advantages of laser application in metal processing are significant: the process is contactless, precise and fast, and does not cause deformation in the material [10].…”

Section: Introductionmentioning

confidence: 99%

Corrosion characteristics of laser-cleaned surfaces on iron artefact

Radojković¹,

Jegdić²,

Bobić³

et al. 2020

Zaštita materijala

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Nd:YAG laser was used for cleaning surfaces of cultural heritage iron artefacts covered with corrosion products. The corrosion products were removed without damaging the base material. Three different electrochemical techniques were used for the determination of the corrosion rate of mechanically prepared iron, laser-cleaned iron and laser-cleaned iron with Paraloid B44 coating. The morphology of the tested surfaces was analysed by SEM. The linear polarization resistance technique, electrochemical impedance spectroscopy and linear sweep voltammetry have shown that the corrosion rate of the laser-cleaned iron is approximately 50 % higher than the corrosion rate of the mechanically prepared iron. Electrochemical impedance spectroscopy has shown that the pore resistance of the Paraloid coating on the laser-cleaned iron sample decreases at the beginning of the test and remains approximately constant after this period. At the beginning of the test, the charge transfer resistance value is constant and then decreases rapidly i.e. the corrosion rate of the iron in the Paraloid coating pores increases with time. During the linear sweep voltammetry test of the iron sample with Paraloid coating, it was noticed that the anodic polarisation curve shows an unusual shape at the potentials more positive than-0.5 V.

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“…Firstly, surface engineering techniques can enhance the tribological performances of the component's surfaces against the surrounding environments and consequently, increase service lifetime and reduce the cost of replacement and maintenance [10]. Secondly, they can give a wide range of options for selecting cheaper substrate materials for certain applications with surface engineering technology [11,12].…”

Section: Introductionmentioning

confidence: 99%

Experimental Studies on Corrosion Behavior of Ceramic Surface Coating using Different Deposition Techniques on 6082-T6 Aluminum Alloy

et al. 2018

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Aluminum alloys cannot be used in aggressive corrosion environments application. In this paper, three different surface coating technologies were used to coat the 6082-T6 aluminum alloy to increase the corrosion resistance, namely Plasma Electrolytic Oxidation (PEO), Plasma Spray Ceramic (PSC) and Hard Anodizing (HA). The cross-sectional microstructure analysis revealed that HA coating was less uniform compared to other coatings. PEO coating was well adhered to the substrate despite the thinnest layer among all three coatings, while the PSC coating has an additional loose layer between the coat and the substrate. X-ray diffraction (XRD) analysis revealed crystalline alumina phases in PEO and PSC coatings while no phase was detected in HA other than an aluminum element. A series of electrochemistry experiments were used to evaluate the corrosion performances of these three types of coatings. Generally, all three-coated aluminum showed better corrosion performances. PEO coating has no charge transfer under all Inductive Coupled Plasma (ICP) tests, while small amounts of Al3+ were released for both HA and PSC coatings at 80 °C. The PEO coating showed the lowest corrosion current density followed by HA and then PSC coatings. The impedance resistance decreased as the immersion time increased, which indicated that this is due to the degradation and deterioration of the protective coatings. The results indicate that the PEO coating can offer the most effective protection to the aluminum substrate as it has the highest enhancement factor under electrochemistry tests compared to the other two coatings.

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Developments in laser-based surface engineering processes: with particular reference to protection against cavitation erosion

Cited by 108 publications

References 95 publications

Effect of process parameters and niobium carbide addition on microstructure and wear resistance of laser cladding nickel‐based alloy coatings

Effect of process parameters and niobium carbide addition on microstructure and wear resistance of laser cladding nickel‐based alloy coatings

Corrosion characteristics of laser-cleaned surfaces on iron artefact

Experimental Studies on Corrosion Behavior of Ceramic Surface Coating using Different Deposition Techniques on 6082-T6 Aluminum Alloy

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