The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform

J Q Wang - One of the best experts on this subject based on the ideXlab platform.

  • influence of oxidation related structural defects on localized corrosion in hvaf sprayed fe based Metallic Coatings
    Surface & Coatings Technology, 2018
    Co-Authors: Suode Zhang, W H Sun, J Q Wang
    Abstract:

    Abstract Oxidation occurred in thermal spray process is an important problem deteriorating corrosion performance of thermal-sprayed Fe-based Metallic Coatings due to the formation of Cr-depleted zones and structural defects around the spray formed oxides. To clarify the correlation between the oxidation related structural defects formed during thermal spray process (i.e. the interparticle regions and the connected pores) and the localized corrosion, a dense Fe-based Metallic Coating with high Cr-content was fabricated, the long term immersion tests which continued for 30 days combined with electrochemical impedance spectroscopy measurements in 3.5 wt% NaCl were performed. It was found that electrolyte solution diffused to the inner Coating through the interparticle oxide layers, and subsequently the localized corrosion developed along the interparticle oxide layers. A number of corrosion pits and corrosion channels were observed along with the interparticle oxide layers for the Coating after one month immersion. Through sealing the diffusion pathways in the as-sprayed Coatings by using aluminum phosphate, the corrosion resistance of the Coatings was enhanced with decreased corrosion current density and improved endurance in long term immersion tests.

  • effect of applied potential on passivation and erosion corrosion of a fe based amorphous Metallic Coating under slurry impingement
    Corrosion Science, 2014
    Co-Authors: Z B Zheng, W H Sun, Y G Zheng, J Q Wang
    Abstract:

    The passive behaviour and erosion corrosion behaviour of a HVOF sprayed Fe-based amorphous Metallic Coating have been investigated in 3.5 wt.% NaCl solution by using potentiostatic polarisation, X-ray photoelectron spectroscopy and Mott-Schottky analysis. The fact that passive current density increased with rising potential might result from the preferential dissolution of high-valence oxides and the existence of more chlorides at a higher potential. The critical flow velocity decreased with rising potential because of the lower resistance of passive film at a higher potential. The reason why passive current density changed under jet impingement was discussed by a simple formula. (C) 2014 Elsevier Ltd. All rights reserved.

  • effect of applied potential on passivation and erosion corrosion of a fe based amorphous Metallic Coating under slurry impingement
    Corrosion Science, 2014
    Co-Authors: Z B Zheng, W H Sun, Yingkui Zheng, J Q Wang
    Abstract:

    The passive behaviour and erosion–corrosion behaviour of a HVOF sprayed Fe-based amorphous Metallic Coating have been investigated in 3.5 wt.% NaCl solution by using potentiostatic polarisation, X-ray photoelectron spectroscopy and Mott–Schottky analysis. The fact that passive current density increased with rising potential might result from the preferential dissolution of high-valence oxides and the existence of more chlorides at a higher potential. The critical flow velocity decreased with rising potential because of the lower resistance of passive film at a higher potential. The reason why passive current density changed under jet impingement was discussed by a simple formula.

  • erosion corrosion of hvof sprayed fe based amorphous Metallic Coating under impingement by a sand containing nacl solution
    Corrosion Science, 2013
    Co-Authors: Z B Zheng, W H Sun, Y G Zheng, J Q Wang
    Abstract:

    Abstract Erosion–corrosion (E–C) behaviour of a Fe-based amorphous Metallic Coating (AMC) compared with 304 stainless steel (304 s.s.) was studied under a slurry impingement condition in a sand-containing NaCl solution. AMC exhibited much higher resistance to E–C than 304 s.s. The weight loss reached the maximum at an impact angle of 90° and the critical flow velocity was about 15 m/s for AMC, while 45° and 9 m/s for 304 s.s. The increment in passive current density under impingement for AMC was about 10 times lower than 304 s.s. Passive films formed at different impact velocities were of different thicknesses.

  • microstructure and properties of fe based amorphous Metallic Coating produced by high velocity axial plasma spraying
    Journal of Alloys and Compounds, 2009
    Co-Authors: X Q Liu, W L Hou, Z Tang, X C Chang, Y G Zheng, J Q Wang, A. Burgess
    Abstract:

    An FeCrMoMnWBCSi amorphous Metallic Coating with thickness of about 1 mm and porosity less than 0.1% was deposited onto a mild steel by a high velocity axial plasma spraying. The microstructure evolution of the Coating was characterized with SEM, XRD, and the Coating micro-hardness, erosion–corrosion and corrosion behavior were tested. It was found that the formation of amorphous phase in the Coating is sensitive to plasma spray parameters, and powder size. The Coating exhibited a good combination of high micro-hardness and excellent erosion–corrosion resistance even in a serious media. This amorphous Metallic Coating could be applied as a good alternative material in erosion and corrosion environments.

Jun Shen - One of the best experts on this subject based on the ideXlab platform.

  • corrosion and erosion corrosion behaviour of activated combustion high velocity air fuel sprayed fe based amorphous Coatings in chloride containing solutions
    Corrosion Science, 2015
    Co-Authors: Y G Zheng, Y Wang, Z Z Xing, Anisur Rahman, J Jiao, S J Qu, Jun Shen
    Abstract:

    Abstract Corrosion and erosion–corrosion (E–C) behaviour of the AC-HVAF sprayed FeCrMoMnWBCSi amorphous Metallic Coating (AMC) were investigated. Compared with the HVOF AMC, the AC-HVAF AMC presents relatively denser structure with lower porosity and almost nonexistent oxides, which holds higher ability to resist uniform corrosion and pitting owing to the impact structure and the low donor density in the passive film. The enhanced E–C resistance of AC-HVAF AMC could be related to the high hardness and compact structure resulting in the low erosion and synergy weight loss.

  • corrosion and erosion corrosion behaviour of activated combustion high velocity air fuel sprayed fe based amorphous Coatings in chloride containing solutions
    Corrosion Science, 2015
    Co-Authors: Y Wang, Z Z Xing, Q Luo, Anisur Rahman, J Jiao, Y Zheng, Jun Shen
    Abstract:

    Abstract Corrosion and erosion–corrosion (E–C) behaviour of the AC-HVAF sprayed FeCrMoMnWBCSi amorphous Metallic Coating (AMC) were investigated. Compared with the HVOF AMC, the AC-HVAF AMC presents relatively denser structure with lower porosity and almost nonexistent oxides, which holds higher ability to resist uniform corrosion and pitting owing to the impact structure and the low donor density in the passive film. The enhanced E–C resistance of AC-HVAF AMC could be related to the high hardness and compact structure resulting in the low erosion and synergy weight loss.

  • Synthesis of Fe-Cr-Mo-C-B amorphous Coating with high corrosion resistance
    Materials Letters, 2012
    Co-Authors: Yongjiang Huang, Yuanzhi Guo, Hongbo Fan, Jun Shen
    Abstract:

    Abstract Fe-based Metallic glasses usually possess ultrahigh hardness, elastic modulus/limit and wear/corrosion resistance. In the present investigation, atmospheric plasma spray was used to deposit Fe-based Metallic Coatings onto 921A navy steel and Ti–6Al–4V alloy substrates. The microstructure and corrosion properties of the Fe-based Metallic Coatings were studied. It was found that the obtained Fe-based Coating with about 300 μm in thickness showed fully amorphous state and possessed low porosity. Moreover, the Fe-based Coating exhibited better corrosion resistance than 921A navy steel and Ti–6Al–4V alloy in aggressive H 2 SO 4 solutions. This amorphous Metallic Coating could be applied as an excellent alternative material in corrosion environments.

Y Wang - One of the best experts on this subject based on the ideXlab platform.

Y G Zheng - One of the best experts on this subject based on the ideXlab platform.

  • corrosion and erosion corrosion behaviour of activated combustion high velocity air fuel sprayed fe based amorphous Coatings in chloride containing solutions
    Corrosion Science, 2015
    Co-Authors: Y G Zheng, Y Wang, Z Z Xing, Anisur Rahman, J Jiao, S J Qu, Jun Shen
    Abstract:

    Abstract Corrosion and erosion–corrosion (E–C) behaviour of the AC-HVAF sprayed FeCrMoMnWBCSi amorphous Metallic Coating (AMC) were investigated. Compared with the HVOF AMC, the AC-HVAF AMC presents relatively denser structure with lower porosity and almost nonexistent oxides, which holds higher ability to resist uniform corrosion and pitting owing to the impact structure and the low donor density in the passive film. The enhanced E–C resistance of AC-HVAF AMC could be related to the high hardness and compact structure resulting in the low erosion and synergy weight loss.

  • effect of applied potential on passivation and erosion corrosion of a fe based amorphous Metallic Coating under slurry impingement
    Corrosion Science, 2014
    Co-Authors: Z B Zheng, W H Sun, Y G Zheng, J Q Wang
    Abstract:

    The passive behaviour and erosion corrosion behaviour of a HVOF sprayed Fe-based amorphous Metallic Coating have been investigated in 3.5 wt.% NaCl solution by using potentiostatic polarisation, X-ray photoelectron spectroscopy and Mott-Schottky analysis. The fact that passive current density increased with rising potential might result from the preferential dissolution of high-valence oxides and the existence of more chlorides at a higher potential. The critical flow velocity decreased with rising potential because of the lower resistance of passive film at a higher potential. The reason why passive current density changed under jet impingement was discussed by a simple formula. (C) 2014 Elsevier Ltd. All rights reserved.

  • erosion corrosion of hvof sprayed fe based amorphous Metallic Coating under impingement by a sand containing nacl solution
    Corrosion Science, 2013
    Co-Authors: Z B Zheng, W H Sun, Y G Zheng, J Q Wang
    Abstract:

    Abstract Erosion–corrosion (E–C) behaviour of a Fe-based amorphous Metallic Coating (AMC) compared with 304 stainless steel (304 s.s.) was studied under a slurry impingement condition in a sand-containing NaCl solution. AMC exhibited much higher resistance to E–C than 304 s.s. The weight loss reached the maximum at an impact angle of 90° and the critical flow velocity was about 15 m/s for AMC, while 45° and 9 m/s for 304 s.s. The increment in passive current density under impingement for AMC was about 10 times lower than 304 s.s. Passive films formed at different impact velocities were of different thicknesses.

  • microstructure and properties of fe based amorphous Metallic Coating produced by high velocity axial plasma spraying
    Journal of Alloys and Compounds, 2009
    Co-Authors: X Q Liu, W L Hou, Z Tang, X C Chang, Y G Zheng, J Q Wang, A. Burgess
    Abstract:

    An FeCrMoMnWBCSi amorphous Metallic Coating with thickness of about 1 mm and porosity less than 0.1% was deposited onto a mild steel by a high velocity axial plasma spraying. The microstructure evolution of the Coating was characterized with SEM, XRD, and the Coating micro-hardness, erosion–corrosion and corrosion behavior were tested. It was found that the formation of amorphous phase in the Coating is sensitive to plasma spray parameters, and powder size. The Coating exhibited a good combination of high micro-hardness and excellent erosion–corrosion resistance even in a serious media. This amorphous Metallic Coating could be applied as a good alternative material in erosion and corrosion environments.

Z B Zheng - One of the best experts on this subject based on the ideXlab platform.