Abstract:This work evaluates the microstructure and corrosion behaviour of Al coating deposited by cold spraying onto FSW AA2219 alloy. The results showed that a dense coating could be deposited on the FSW joint surface with low porosity (0.77%). XRD analysis indicated that no new phases were formed during the spraying. Refined grains were observed in the coating as expected by SEM results. Electrochemical tests revealed the coating had positive corrosion resistance performance. Immersion tests confirmed that the coati… Show more
“…[8] and Zhao et al. [9]. Figure 1 SEM images and LDS analyses of the feedstock powders: (a) alumina and (b) aluminium. Figure 2 X-ray diffractograms of the powders and coatings.…”
Section: Resultsmentioning
confidence: 99%
“…Qiu et al [7] reported that the tamping effect provided by Al 2 O 3 particles decreased the porosity of coatings, increased the hardness, and improved the wear resistance. Reinforcement with these particles avoids plastic deformation of the Al matrix and diminishes the adhesive wear of the material [8,9]. Cong et al [6] investigated the mechanical properties and corrosion resistance of Al-25%Al 2 O 3 coatings on carbon steel substrate.…”
This work describes the influence of standoff distance (SoD), and gas temperature on the morphology and corrosion resistance of Al-10%Al2O3 coatings deposited by cold gas spray (CGS) on carbon steel. The results showed that the standoff distance had little effect on the thickness and microstructure of the coating. However, a 100 °C decrease of the spraying temperature reduced the coating thickness by 300 µm. The use of electrochemical analyses and SEM images showed that all the coatings studied were able to protect the substrate during at least 1300 h of immersion, due to the dense microstructure obtained by CGS.
“…[8] and Zhao et al. [9]. Figure 1 SEM images and LDS analyses of the feedstock powders: (a) alumina and (b) aluminium. Figure 2 X-ray diffractograms of the powders and coatings.…”
Section: Resultsmentioning
confidence: 99%
“…Qiu et al [7] reported that the tamping effect provided by Al 2 O 3 particles decreased the porosity of coatings, increased the hardness, and improved the wear resistance. Reinforcement with these particles avoids plastic deformation of the Al matrix and diminishes the adhesive wear of the material [8,9]. Cong et al [6] investigated the mechanical properties and corrosion resistance of Al-25%Al 2 O 3 coatings on carbon steel substrate.…”
This work describes the influence of standoff distance (SoD), and gas temperature on the morphology and corrosion resistance of Al-10%Al2O3 coatings deposited by cold gas spray (CGS) on carbon steel. The results showed that the standoff distance had little effect on the thickness and microstructure of the coating. However, a 100 °C decrease of the spraying temperature reduced the coating thickness by 300 µm. The use of electrochemical analyses and SEM images showed that all the coatings studied were able to protect the substrate during at least 1300 h of immersion, due to the dense microstructure obtained by CGS.
“…As CSAM allows for grain refinement, the grain boundaries become distort and their number increases. Hence, corrosion performance of the FSWed joints improves [49,147,148].…”
Section: Enhancement Of Friction Stir Welded Jointsmentioning
confidence: 99%
“…As CSAM allows for grain refinement, the grain boundaries become distort and their number increases. Hence, corrosion performance of the FSWed joints improves [49, 147, 148]. Figure 47 CSAM reduces the residual stress of the FSWed joints: (a) process, (b) residual stress distribution across the joint following CSAM [145].…”
Section: Performance Improvement Of Substrates With Hybrid Cold Spraymentioning
Cold spray (CS) is a new solid state coating technique that has attracted considerable attention as it is quite suitable for mass production of metallic materials or metal matrix composites. More recently, cold spray additive manufacturing (CSAM) has been proposed to fabricate/repair components or produce welding joint. However, inherently deficient in ductility/plasticity of CSAMed materials limits its application. Therefore, many hybrid processes have been proposed to further explore CS, which can be grouped together as 'cold spray +' hybrid processes (laser, shot peening and friction stir processing). This review will summarise the state-of-the-art of the 'cold spray +' processes to show their abilities and their effectiveness. Recommendations for further research and development have been incorporated to help widespread the process.
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