Abstract:There is an urgent need to improve the corrosion resistance of WC-based cermet coatings in different corrosive environments. The main objective of this work was to investigate the microstructure and evaluate the corrosion resistance in neutral, acidic, and alkaline electrolytes of the WC-based cermet/Fe-based amorphous alloy composite coating. Thus, a composite coating of WC-CoCr/Fe-based amorphous alloy and a single WC-CoCr coating were fabricated using the high-velocity oxygen fuel (HVOF) process. The phase … Show more
“…Additionally, in the C3 coating, the Cr 3 C 2 (PDF#00-035-0804) and Cr 7 C 3 (PDF#00-036-1482) carbides have been identified. Moreover, crystallites were detected in the C2 coating in the presence of cubic W (PDF#00-001-1204), which is in agreement with literature data [ 40 ]. It should be noted that no peaks coming either from the WC 1-x phase or from the Co 3 W 3 C or Co 6 W 6 C phases were found in the coatings, but those phases were identified in other papers and feedstock powders ( Figure 15 ) [ 24 , 41 , 42 , 43 ].…”
In this paper, three commercial cermet powders, WC-Co-Cr, WC-Co and WC-Cr3C2-Ni, were sprayed by the High Velocity Oxy Fuel (HVOF) method onto magnesium alloy AZ31 substrate. The coatings were investigated in terms of their microstructure, phase analysis and residual stress. The manufactured coatings were analyzed extensively using optical microscopy (OM), X-ray diffraction (XRD), scanning (SEM) and transmission electron microscopy (TEM). Based on microstructure studies, it was noted that the coatings show satisfactory homogeneity. XRD analysis shows that in WC-Co, WC-Co-Cr and WC-Cr3C2-Ni coatings, main peaks are related to WC. Weaker peaks such as W2C, Co0.9W0.1, Co and W for WC-Co and W2C, Cr3C2 and Cr7C3 for WC-Cr3C2-Ni also occur. In all cermet coatings, linear stress showed compressive nature. In WC-Co and WC-Cr3C2-Ni, residual stress had a similar value, while in WC-Co-Cr, linear stress was lower. It was also proved that spraying onto magnesium substrate causes shear stress in the WC phase, most likely due to the low elastic modulus of magnesium alloy substrate.
“…Additionally, in the C3 coating, the Cr 3 C 2 (PDF#00-035-0804) and Cr 7 C 3 (PDF#00-036-1482) carbides have been identified. Moreover, crystallites were detected in the C2 coating in the presence of cubic W (PDF#00-001-1204), which is in agreement with literature data [ 40 ]. It should be noted that no peaks coming either from the WC 1-x phase or from the Co 3 W 3 C or Co 6 W 6 C phases were found in the coatings, but those phases were identified in other papers and feedstock powders ( Figure 15 ) [ 24 , 41 , 42 , 43 ].…”
In this paper, three commercial cermet powders, WC-Co-Cr, WC-Co and WC-Cr3C2-Ni, were sprayed by the High Velocity Oxy Fuel (HVOF) method onto magnesium alloy AZ31 substrate. The coatings were investigated in terms of their microstructure, phase analysis and residual stress. The manufactured coatings were analyzed extensively using optical microscopy (OM), X-ray diffraction (XRD), scanning (SEM) and transmission electron microscopy (TEM). Based on microstructure studies, it was noted that the coatings show satisfactory homogeneity. XRD analysis shows that in WC-Co, WC-Co-Cr and WC-Cr3C2-Ni coatings, main peaks are related to WC. Weaker peaks such as W2C, Co0.9W0.1, Co and W for WC-Co and W2C, Cr3C2 and Cr7C3 for WC-Cr3C2-Ni also occur. In all cermet coatings, linear stress showed compressive nature. In WC-Co and WC-Cr3C2-Ni, residual stress had a similar value, while in WC-Co-Cr, linear stress was lower. It was also proved that spraying onto magnesium substrate causes shear stress in the WC phase, most likely due to the low elastic modulus of magnesium alloy substrate.
“…Yasir et al [369,370] examined the impact of Al 2 O 3 addition on corrosion properties of Fe-based MGC (Figure 60b) and found that the composite coatings were free from any galvanic corrosion effect. Further, Xu et al [371] investigated the corrosion performance of WC/Fe-based MG composite coating and found superior corrosion properties for composite coating in NaCl solution (Figure 60c), but degraded properties in an HCl environment.…”
Section: Ex-situ Composite Coatingsmentioning
confidence: 99%
“…Yasir et al [369,370] examined the impact of Al 2 O 3 addition on corrosion properties of Fe-based MGC (Figure 60b) and found that the composite coatings were free from any galvanic corrosion effect. Further, Xu et al [371] investigated the corrosion performance of WC/Fe-based MG composite coating and found superior corrosion properties for composite coating in NaCl solution (Figure 60c), but degraded properties in an HCl environment. Figure 60. Corrosion properties of different ex-situ Fe-based MG composite coatings: Polarization plots of Fe-based MG composite coatings; (a) with and without TiN addition [368], (b) containing various weight fractions of Al 2 O 3 phase [369] and (c) as-sprayed WC–CoCr and composite coatings [371], in 3.5% NaCl solution. Cited images have been reproduced with due permission from the publishers.…”
Section: Fe-based Metallic Glass Composite Coatings: Optimization Of ...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.
“…Hydraulic machinery working in the Yellow River is inevitably eroded by sediment. Traditionally, these components are fabricated of stainless steel [1,2], when sand grains impact the surface of the flow components, the strong deformation work drives the material to deform or crack off, and consequently caused the wear of the material [4], naturally then, the efficiency and service life of hydraulic machinery are reduced [2,5,6], which causing significant economic losses. Therefore, it is necessary to coat the components with coatings which exhibit excellent wear resistance.…”
The present study investigated the erosion wear behavior of WC-Ni and WC-Cr 3 C 2 -Ni cermet coatings deposited by high velocity oxy-fuel (HVOF) spray process on the substrate of 1Cr18Ni9Ti stainless steel. Microstructures and morphologies of the coatings were examined using SEM images, and x-ray diffractometer was used to analyze the phase composition of the powder and the coatings. The erosion test was carried out using home-made jet rig. In order to better fit the research background of this study, the erodent used for erosion was taken from the Yellow River, China. The coating is well combined with the substrate; and WC-Cr 3 C 2 -Ni coating consists of WC, Cr 3 C 2 and Ni phases, WC-Ni coating consists of WC, W 2 C and Ni phases. Some mechanical properties of the two coatings were compared, WC-Cr 3 C 2 -Ni coatings have higher hardness to be compared with WC-Ni ones due to a lower binder content; and the elasticity modulus and nano-hardness values of the WC-Cr 3 C 2 -Ni coating are higher than that of the WC-Ni coating. The relationship between the wear performance of the coatings and impingement angle was obtained; and the erosion resistance of the coatings was analyzed. It was observed that WC-Cr 3 C 2 -Ni cermet coating exhibits higher erosion resistance under all testing conditions as compared with the WC-Ni cermet coating and 1Cr18Ni9Ti stainless steel. The results show that the erosion mechanism at low angle is mainly cutting, while erosion pits dominate at high angle for the coatings, moreover, plastic deformation could be observed in the case of the binder depletion and cracking found place. and the erosion mechanisms of the 1Cr18Ni9Ti stainless steel are mainly cutting and plastic deformation at low angle and high angle, respectively.
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