Abstract:Fe-based amorphous alloys (FAA) have excellent anti-corrosion and anti-abrasive comprehensive performances. However, sprayed thin FAA coatings with high porosity cannot provide efficient protection, or even accelerate the corrosion rate of the substrate due to galvanic corrosion. Laser re-melting densifying is usually used to improve the anti-corrosion performance of sprayed coatings. There are two disadvantages of the common laser re-melting method, including crystallization and residual stress. In the presen… Show more
“… Figure 52. Prospective strategies for enhancement of corrosion properties in thermal sprayed Fe-based MGCs. Some of the representative images were taken from [336, 341, 349, 352, 359, 394]. …”
Section: Strategies To Improve the Corrosion Properties Of Thermal Sp...mentioning
confidence: 99%
“…It was observed that the re-melted coating displayed improved corrosion behaviour because of denser structure; although the fraction of the amorphous phase decreased after the re-melting process, the evolution of dense structure was the significant factor in enhancing corrosion properties (Figure 54). On the contrary, Han et al [349] observed that laser re-melting on cold sprayed Fe-based MGC resulted in enhanced wear resistance, but it could not improve the corrosion properties significantly, ascribed to degradation in the passive film due to the presence of cracks. Therefore, further optimization of the laser re-meting parameters must be performed and the quantitative comparison of the influence of amorphization and microstructure on corrosion properties of coating after the re-melting process should be carried out.…”
Section: Strategies To Improve the Corrosion Properties Of Thermal Sp...mentioning
Among various materials available for alleviating the corrosion-related degradation, thermal sprayed Fe-based metallic glass coatings (MGCs) have received huge attention from the scientific community due to the exceptional combination of mechanical and corrosion properties, along with commercially attractive low material cost of this particular alloy system. Emerging reports on the thermal sprayed Fe-based MGCs outperforming conventional corrosion-resistant materials and coatings have accelerated further exploration of this domain, resulting in an immense increase of research activities over the last few decades producing fascinating results. This review takes a holistic approach encompassing an in-depth assessment of all the relevant salient work till date, including corrosion properties, corresponding degradation mechanisms, metallurgical and environmental factors with reference to passive film dynamics and/or formation of corrosion products. Moreover, various strategies for improved corrosion properties and recent research progress have been reviewed with an attempt to identify the present knowledge gaps and the future research directions.
“… Figure 52. Prospective strategies for enhancement of corrosion properties in thermal sprayed Fe-based MGCs. Some of the representative images were taken from [336, 341, 349, 352, 359, 394]. …”
Section: Strategies To Improve the Corrosion Properties Of Thermal Sp...mentioning
confidence: 99%
“…It was observed that the re-melted coating displayed improved corrosion behaviour because of denser structure; although the fraction of the amorphous phase decreased after the re-melting process, the evolution of dense structure was the significant factor in enhancing corrosion properties (Figure 54). On the contrary, Han et al [349] observed that laser re-melting on cold sprayed Fe-based MGC resulted in enhanced wear resistance, but it could not improve the corrosion properties significantly, ascribed to degradation in the passive film due to the presence of cracks. Therefore, further optimization of the laser re-meting parameters must be performed and the quantitative comparison of the influence of amorphization and microstructure on corrosion properties of coating after the re-melting process should be carried out.…”
Section: Strategies To Improve the Corrosion Properties Of Thermal Sp...mentioning
Among various materials available for alleviating the corrosion-related degradation, thermal sprayed Fe-based metallic glass coatings (MGCs) have received huge attention from the scientific community due to the exceptional combination of mechanical and corrosion properties, along with commercially attractive low material cost of this particular alloy system. Emerging reports on the thermal sprayed Fe-based MGCs outperforming conventional corrosion-resistant materials and coatings have accelerated further exploration of this domain, resulting in an immense increase of research activities over the last few decades producing fascinating results. This review takes a holistic approach encompassing an in-depth assessment of all the relevant salient work till date, including corrosion properties, corresponding degradation mechanisms, metallurgical and environmental factors with reference to passive film dynamics and/or formation of corrosion products. Moreover, various strategies for improved corrosion properties and recent research progress have been reviewed with an attempt to identify the present knowledge gaps and the future research directions.
“…However, the cold spray coating has some limitations, such as superficial roughness, porosity, etc. These limitations could be conquered through post spraying superficial treatment (laser re-melting) [187]. The various types of lasers that can be utilized for remelting are: The friction stir processed coated layer and the base sample produce distortion in the coating substrate interface and developed a mechanical interlocking effect.…”
Section: Laser Re-melting Treatmentmentioning
confidence: 99%
“…However, the cold spray coating has some limitations, such as superficial roughness, porosity, etc. These limitations could be conquered through post spraying superficial treatment (laser re-melting) [187]. The various types of lasers that can be utilized for remelting are: Continuous CO 2 lasers with a power supply to 5 KW;Continuous CO 2 lasers with powers in order of 100 W;Pulsed Nd: YAG lasers;Power diode lasers with powers in order of few KW [188,189].…”
Section: Influence Of Processing Conditions On the Properties Of Cold...mentioning
Cold spray is an emerging surface coating technology for rapidly developing thick coating, thin films and additive manufacturing of parts at relatively low temperatures. The low cost and scalability of a cold spray method make it promising for diverse industrial applications. Presently, the cold spray coating is widely used for the production of machine parts, materials and tools that requires the desired surface properties. However, the consideration of process parameters setting develops a reliable coating having high mechanical, tribological, fatigue and morphological properties for demanding coating applications. Hence, the aim of this paper is to study the effect of processing conditions (pressure and temperature of propellant gas, powder particle morphology and post-process treatments) on the tribological and mechanical properties of cold-sprayed coatings. Further, the effect of microstructure and processing conditions on the fatigue and static characteristics of cold spray material is also discussed.
“…Nanocrystals produced by post-processing methods such as laser remelting are also very helpful to improve the wear resistance of coatings. 78 At the same time, in the face of different working conditions, the wear mechanism is different, and the research on the wear performance under the working conditions is conducive to the targeted development of amorphous coatings so as to promote their engineering applications.…”
Compared with crystal alloy, amorphous alloy features atomic arrangement of long-range disorder and near-range order; it has no crystal boundary, dislocation and other defects that can easily promote corrosion initiation and development. With good mechanical properties, wear resistance and corrosion resistance properties, today amorphous alloys have become a research hotspot worldwide. However, the amorphous formation ability is limited, which restricts large-scale preparation, popularization and application of three-dimensional block materials. Due to the technical characteristics of rapid solidification, laser cladding technology and spraying technology are beneficial to the efficient preparation and transformation of amorphous alloy in the form of coating materials. According to the current research progress of amorphous and nanocrystalline composite coatings, this article introduces the typical amorphous and nanocrystalline composite coating alloy systems, summarizes the research progress of preparing amorphous and nanocrystalline composite coatings and expounds the research situation of the main mechanical properties, wear resistance and corrosion resistance of amorphous and nanocrystalline composite coatings. Finally, the application scope of amorphous and nanocrystalline composite coatings is reviewed, and the current problems and future development trends in the study of amorphous and nanocrystalline composite coating are indicated.Zhibin Zhang and Jiachi Yuan have contributed equally to this work.
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