Enhancement in the corrosion resistance of WC coatings by adding a Fe-based alloy in simulated seawater

Wang, Gang; Xing, Chang; Tao, Feng; Ding, Pengfei; Huang, Zujian

doi:10.1016/j.surfcoat.2016.08.009

Cited by 17 publications

(10 citation statements)

References 24 publications

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“…Despite there are some pores, the average porosity of the coating is less than 2%. A similar morphology was observed in other investigations [12,[20][21][22][23]. EDS analysis on area 1 indicated in Figure 3a shows that the coating contains W, Co, and Cr.…”

Section: Powder Morphologysupporting

confidence: 88%

“…From the microstructure, the composite coating displays a dense layer structure and a good bond of both the tungsten carbide/binder interface and the WC-based cermet/Fe-based amorphous alloy interface, as shown in Figures 5 and 6. Regarding chemical composition, the addition of Fe-based amorphous alloy deduces the content of Co binder, which has relatively high corrosion rate [23,27]. Furthermore, both amorphous phase and WC matrix contain Cr, which is in favor of self-passivation.…”

Section: Electrochemical Corrosion Behavior In 35 Wt % Nacl Solutionmentioning

confidence: 99%

“…Furthermore, both amorphous phase and WC matrix contain Cr, which is in favor of self-passivation. Meanwhile, the Mo, B and C in amorphous phase all contribute to enhancing the corrosion resistance [23,28].…”

Section: Electrochemical Corrosion Behavior In 35 Wt % Nacl Solutionmentioning

confidence: 99%

“…The R p value of the composite coating is 7399 Ω cm 2 , which is higher than that of the WC-CoCr coating (6755 Ω cm 2 ). It is believed that the extent of corrosion is determined by the corrosion potential, the corrosion rate is determined by the corrosion current density [23], and the polarization resistance corresponds to corrosion resistance. Thus, the more positive E corr, the lower i corr and the higher R p of the composite coating indicate a better corrosion resistance than the WC-CoCr coating.…”

Section: Electrochemical Corrosion Behavior In 35 Wt % Nacl Solutionmentioning

confidence: 99%

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Microstructure and Corrosion Resistance of WC-Based Cermet/Fe-Based Amorphous Alloy Composite Coatings

Song

Zhang

et al. 2018

Coatings

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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 composition, microstructure of the original powders, and as-sprayed coatings were studied. The detailed interface information between different compositions of the composite coating was observed by high-resolution transmission electron microscopy (HRTEM). The corrosion resistance of the coatings was studied comparatively by electrochemical tests in 3.5 wt % NaCl, 1 M HCl and 1 M NaOH solutions, respectively. Results showed that the composited coating had a dense layered structure with a composition of WC, Fe-based amorphous alloy, and small amount of W 2 C. It was revealed that obvious inter-diffusion exists between the interfaces of tungsten carbide/Co, Cr binder and WC-CoCr/Fe-based amorphous alloy. The electrochemical test results showed that the composite coating displayed better corrosion resistance than single WC-CoCr coating both in 3.5 wt % NaCl solution and in 1 M NaOH solution.

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Section: Powder Morphologysupporting

confidence: 88%

Section: Electrochemical Corrosion Behavior In 35 Wt % Nacl Solutionmentioning

confidence: 99%

Section: Electrochemical Corrosion Behavior In 35 Wt % Nacl Solutionmentioning

confidence: 99%

Section: Electrochemical Corrosion Behavior In 35 Wt % Nacl Solutionmentioning

confidence: 99%

See 2 more Smart Citations

Microstructure and Corrosion Resistance of WC-Based Cermet/Fe-Based Amorphous Alloy Composite Coatings

Song

Zhang

et al. 2018

Coatings

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“…In corrosion potential of Cu-Co/WC nano-composites, a negative shift can be seen, con rming the cathodic protective nature of the coatings. This observation is opposed to the corrosion investigation results of pulse electrodeposited Ni-W-SiC coating [4], but similar to those reported for Ni-W/ZrO 2 nano-composite coatings [11] and WC-Co/Fe nano-composite coatings [12].…”

Section: Resultssupporting

confidence: 72%

The effect of current density on microstructural homogeneity, hardness, fracture toughness and electrochemical behavior of electrodeposited Cu-0.5Co/WC nano-composite coating

2017

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Abstract. The Cu-0.5Co/WC nano-composite coating was synthesized on CP-copper substrate using Direct Current (DC) electrodeposition method. In this work, it was tried to increase the hardness of surface without considerable degradation of copper's particular physical properties such as electrical conductivity. The e ect of current density on microstructural homogeneity, hardness, fracture toughness, and electrochemical behavior of coating was investigated. The copper plates with the purity of 99.99% were used as electrodes. The electrolyte consists of tungsten carbide particles (30 g/l), copper sulfate (200 g/l), sulfuric acid (50 g/l), cobalt sulfate (50 g/l), and Sodium Dodecyl Sulfate (SDS) (0.3 g/(g of WC)) as surfactant. The particle size of tungsten carbide powder was in the range of 40-70 nm. The distribution of tungsten carbide particles in coating was studied using FESEM. Micro-hardness measurement was performed in Vickers scale. The fracture toughness of coating was determined by Vickers indentation test. The corrosion resistance of the electrodeposited Cu-Co and Cu-Co/WC nano-composite coatings was evaluated by polarization studies. Referring to the results, the use of optimum current density value (60 mA/cm 2 ) during the electrodeposition process improves hardness and corrosion resistance of nano-composite coating. Additionally, Cu-Co/WC composite coating shows more corrosion resistance than the unreinforced one.

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Tungsten Carbides

Shabalin

2022

Ultra-High Temperature Materials IV

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Enhancement in the corrosion resistance of WC coatings by adding a Fe-based alloy in simulated seawater

Cited by 17 publications

References 24 publications

Microstructure and Corrosion Resistance of WC-Based Cermet/Fe-Based Amorphous Alloy Composite Coatings

Microstructure and Corrosion Resistance of WC-Based Cermet/Fe-Based Amorphous Alloy Composite Coatings

The effect of current density on microstructural homogeneity, hardness, fracture toughness and electrochemical behavior of electrodeposited Cu-0.5Co/WC nano-composite coating

Tungsten Carbides

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