Erosion and Corrosion Resistance Performance of Laser Metal Deposited High-Entropy Alloy Coatings at Hellisheidi Geothermal Site

Thorhallsson, Andri Isak; Fanicchia, Francesco; Davison, Emily S; Paul, Shiladitya; Davíđsdóttir, Svava; Ólafsson, Dagur Ingi

doi:10.3390/ma14113071

Cited by 11 publications

(10 citation statements)

References 17 publications

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“…However, the poor corrosion resistance of low-carbon steel seriously affects its service life. Andri Isak Thorhallsson et al [71] successfully prepared Co-Cr-F-eNi-Mo 0.85 and Al 0.5 -Co-Cr-Fe-Ni HEA coatings on the surface of low-carbon steel, and tested the anti-corrosion ability of the coatings under three actual geothermal environments. The results show that the corrosion environment has a significant impact on the anti-corrosion ability of the coatings, especially when the HEA coatings have manufacturing defects, as it will further aggravate the corrosion of the coatings.…”

Section: Influence Of Corrosive Environmentmentioning

confidence: 99%

Corrosion of Laser Cladding High-Entropy Alloy Coatings: A Review

et al. 2022

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Material corrosion is a common phenomenon. Severe corrosion not only causes material failure, but may also lead to unexpected catastrophic accidents. Therefore, reducing the loss caused by corrosion has become a problem faced by countries around the world. As a surface modification technology, laser cladding (LC) can be used to prepare coatings that can achieve metallurgical bonding with the substrate. High-entropy alloys (HEAs) are a new material with superior anti-corrosion ability. Therefore, HEA coatings prepared by LC have become a research hotspot to improve the anti-corrosive ability of material surfaces. In this work, the effects of LC process parameters, post-processing, and the HEA material system on the anti-corrosion ability of HEA coatings and their mechanisms are reviewed. Among them, the LC process parameters influence the anti-corrosion ability by affecting the macroscopic quality, dilution rate, and uniformity of the coatings. The post-processing enhances the anti-corrosion ability of the coatings by improving the internal defects and refining the grain structure. The anti-corrosion ability of the coatings can be improved by appropriately adding transition metal elements such as Ni, Cr, Co, and rare earth elements such as Ce and Y. However, the lattice distortion, diversification of phase composition, and uneven distribution caused by excess elements will weaken the corrosion protection of the coatings. We reviewed the impact of corrosion medium on the anti-corrosion ability of coatings, in which the temperature and pH value of the corrosion medium affect the quality of the passive film on the surface of the coatings, thereby affecting the anti-corrosion ability of the coatings. Finally, to provide references for future research, the development trend of preparing HEA coatings by LC technology is prospected.

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Section: Influence Of Corrosive Environmentmentioning

confidence: 99%

Corrosion of Laser Cladding High-Entropy Alloy Coatings: A Review

et al. 2022

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“…The control of surface wettability is a key technological issue in several areas, such as microelectronics, separation membranes, car windows, self-cleaning surfaces, motion indicators, and biotechnology [ 7 , 8 , 9 , 10 , 11 , 12 ]. The leading technologies used for hydrophobic/hydrophilic thin film deposition and surface modification include chemical vapor deposition [ 13 ], laser ablation [ 14 , 15 ], and plasma treatment [ 16 ]. Superhydrophobic surfaces have a variety of uses in self-cleaning, anti-icing and anti-stick applications.…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface Topology on the Apparent Thermal Diffusivity of Thin Samples at LFA Measurements

Szczepaniak

2022

Materials

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This paper deals with the problem of the influence of surface topography on the results of thermal diffusivity measurements when determined using the instantaneous surface heat source method, also called the pulse method. The analysis was based on numerical tests carried out using Comsol Multiphysics software. The results of experimental investigations on the actual material structure using an electron microscope, an optical microscope and a profilometer were used to develop a numerical model. The influence of the non-uniformity of the surface of the tested sample on the determined values of half-time of the thermal response of the sample’s rough surface to the impulse forcing on the opposing flat surface was determined by developing the data for simulated measurements. The effect of the position of the response data reading area on the obtained simulation results was also analyzed. The obtained results can be used to improve the accuracy of experimental heat transfer studies performed on thin-film engineering structures depending on the uniformity and parallelism of the material applied to engineering structures. The difference in half-life determination error results for various analyzed models can be as high as 16.7%, depending on the surface from which the responses of the heating impulse are read. With an equivalent model in which 10% of the material volume corresponds to the rough part as a single inclusion, hemisphere, the error in determining thermal diffusivity was equal to 3.8%. An increase in the number of inclusions with smaller weight reduces an error in the determination of thermal diffusivity, as presented in the paper.

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“…The corrosion and erosion resistance of CoCrFeNiMo 0.85 coatings manufactured by laser metal deposition technique was previously tested in a geothermal environment [7]. The results revealed good erosion resistance and no corrosion damage when exposed to different conditions, leading to the conclusion that this type of newly developed coating is suitable for aggressive media Zihui Dong et al [8] studied CoCrFeMo 0/85 Ni powder, produced by atomization, for differential thermal analyses and differential scanning calorimetry to assess the thermodynamic properties including solidus, liquidus and phase transitions temperatures.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanically Alloyed CoCrFeNiMo0.85 High-Entropy Alloy for Corrosion Resistance Coatings

et al. 2021

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High-entropy alloys could provide a solution for corrosion resistance due to their impressive properties. Solid-state processing of high purity Co, Cr, Fe, Ni and Mo metallic powders and consolidation resulted in a bulk material that was further machined into electro spark deposition electrodes. After the stainless steel substrate surface preparation, thin successive layers of the high-entropy alloy were deposited and Pull-Off testing was performed on the newly obtained coating, for a better understanding of the adhesion efficiency of this technique. Good adhesion of the coating to the substrate was proved by the test and no cracks or exfoliations were present. Corrosion resistance testing was performed in a liquid solution of 3.5 wt.% NaCl for 6 hours at room temperature and the results obtained validated our hypothesis that CoCrFeNiMo0.85 high-entropy alloys could provide corrosion resistance when coating a stainless steel substrate.

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Erosion and Corrosion Resistance Performance of Laser Metal Deposited High-Entropy Alloy Coatings at Hellisheidi Geothermal Site

Cited by 11 publications

References 17 publications

Corrosion of Laser Cladding High-Entropy Alloy Coatings: A Review

Corrosion of Laser Cladding High-Entropy Alloy Coatings: A Review

Effect of Surface Topology on the Apparent Thermal Diffusivity of Thin Samples at LFA Measurements

Mechanically Alloyed CoCrFeNiMo0.85 High-Entropy Alloy for Corrosion Resistance Coatings

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