Effects of sealing on corrosion behaviour of plasma-sprayed Cr2O3–8TiO2 coating

Zhang, Jingjing; Wang, Zehua; Peng, Lin

doi:10.1179/1743294413y.0000000161

Cited by 29 publications

(17 citation statements)

References 21 publications

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“…Previous studies on thermal spray coatings showed that the immersion time may have a significant effect on corrosion performance of thermally sprayed coatings. [14][15][16][17][18] Conclusion Based on the results from the above experiments, the following conclusions can be drawn. 1.…”

Section: Microhardness Measurements and Polarisation Studymentioning

confidence: 77%

Characterisation and corrosion performance of HVOF sprayed Ni–10 wt-%Ti coatings

Verdian

2014

Surface Engineering

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Mechanically alloyed Ni-10 wt-%Ti powders were deposited on 1045 steel substrate using high velocity oxy-fuel (HVOF) thermal spraying process. The microstructure and phase composition of coatings were evaluated by scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis. The results showed that the phase composition of feedstock powders was preserved during spraying and only supersaturated Ni(Ti) solid solution was present in the coatings. The hardness measurements showed that the hardness of coatings was about 510 HV (50 g). Tafel polarisation tests performed after 1 h immersion revealed that the corrosion behaviour of HVOF Ni-Ti coatings was not affected by substrate. However, delamination of air plasma sprayed (APS) Ni-10 wt-%Ti coatings and significant corrosion of substrate was observed in similar conditions. For HVOF Ni-Ti coating and after 24 h of immersion time, the corrosion of underlying substrate was observed after polarisation measurements but no delamination of coating occurred.

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Section: Microhardness Measurements and Polarisation Studymentioning

confidence: 77%

Characterisation and corrosion performance of HVOF sprayed Ni–10 wt-%Ti coatings

Verdian

2014

Surface Engineering

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“…% NaCl solution. Unfortunately, there are certain micro-pores and micro-cracks in the assprayed ceramic coating due to the characteristic of the formation of the coating [17,18,26]. Some of the open pores and cracks will act as the tunnel for the corrosion medium to penetrate the coating to corrode the substrate.…”

Section: Discussionmentioning

confidence: 99%

“…Oxide ceramics, due to their excellent properties including high hardness, high chemical inertness [13,14] in a variety of aggressive environments [15], and good wear resistance, are promising candidates as corrosion-resistant coatings in industrial applications, although there are some inevitable defects in the coatings [16,17]. Generally, the defects come from unmelted particles, inadequate flow or fragmentation of molten particles under impact status, shadowing effects caused by an improper spraying angle, and entrapped gas [18]. Moreover, vertical and horizontal cracks or pores may occur due to the high cooling rate of the individual splats and poor inter-lamellar bonding [19].…”

Section: Introductionmentioning

confidence: 99%

THE EFFECT OF SEALING PROCESSES ON THE CORROSION BEHAVIOUR OF Al₂O₃-13 WT.%TiO₂ COATING

Shao¹

2019

Ceramics - Silikaty

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A novel post-treatment process was employed to seal a plasma-sprayed Al 2 O 3 -13 wt. % TiO 2 (AT13) coating to improve its corrosion resistance. A series of AT13 coatings were sealed with silicone resin using conventional sealing and ultrasonic sealing at different temperatures. The effect of the sealing treatment on the corrosion behaviours of the coatings were investigated with salt spray tests and electrochemical methods. Most of the ultrasonic sealed coatings had less weight loss than conventional sealed coatings after the salt spray test. In 5.0 wt. % NaCl solutions, the ultrasonic sealed coating had the higher corrosion potential and the lower corrosion current density. The coating sealed at 40 °C has the lowest corrosion weight loss, lowest corrosion current densities and highest corrosion potential, compared with conventional sealed coating. It means that ultrasonic sealing can improve the corrosion resistance of plasma-sprayed AT13 coating effectively and the temperature was a key factor in the sealing treatment.

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“…Sol-Gel procedure for preparing KH570-SiO 2 hybrid agent. Only connecting pores and/or micro-cracks from coating surface to substrate serve as transmitting channels of corrosion medium, so iron reagent test was considered to evaluate the porosity of 'connecting pores and or micro-cracks' of the coatings [7,15]. And the procedure is in accordance with the Chinese standard of the porosity test method for thermal spray coating (JB/T 7509-94), HITACHI-S3400N Scanning Electronic Microscopy (SEM) and Hirox KH-7700 Stereomicroscope (SM) were used to observe microstructure and eroded surface morphology of the coating.…”

Section: Apparatuses and Methods Of Analysismentioning

confidence: 99%

“…Sealing treatment is deemed as an efficient and attractive method on overcoming the disadvantage of plasma spray coating (PSC) mentioned above [5][6][7][8]. In general, there are two sorts of sealing materials [7,[9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Plasma Sprayed Al ₂o₃-13 Wt.%tio₂ Coating Sealed With Organic-Inorganic Hybrid Agent and Its Corrosion Resistance in Acid Environment

Zhou¹

2016

Ceramics - Silikaty

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A novel organic-inorganic hybrid material of γ-methacryloxypropyltrime-thoxysilane (KH570)-SiO 2 was fabricated by Sol-Gel method. The hybrid material was used as the sealing agent for the plasma sprayed Al 2 O 3 -13 wt. % TiO 2 coating. Infrared spectrum and grafted mechanism of the hybrid agent (HA) were studied. Moreover, morphology and porosity, as well as characteristics of immersion plus electrochemical corrosion in acid environment of the coating with and without sealing treatment were evaluated, compared with those of the coating sealed with the conventional silicone resin agent (SRA). The results reveal that KH570 was successfully grafted onto the surface of SiO 2 . The HA film sealed on the surface of the coating presents a little better quality than the SRA film. The porosities of the coatings after the sealing treatment decreased. Furthermore, the sealing treatment can improve efficiently the corrosion resistance of the coating in 5 vol. % HCl solution. The hybrid sealing agent can become a candidate for the plasma sprayed Al 2 O 3 -13 wt. % TiO 2 coating used in acid environment to overcome some disadvantages of organic agents such as severely environmental pollution.

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Effects of sealing on corrosion behaviour of plasma-sprayed Cr₂O₃–8TiO₂ coating

Cited by 29 publications

References 21 publications

Characterisation and corrosion performance of HVOF sprayed Ni–10 wt-%Ti coatings

Characterisation and corrosion performance of HVOF sprayed Ni–10 wt-%Ti coatings

THE EFFECT OF SEALING PROCESSES ON THE CORROSION BEHAVIOUR OF Al₂O₃-13 WT.%TiO₂ COATING

Plasma Sprayed Al ₂o₃-13 Wt.%tio₂ Coating Sealed With Organic-Inorganic Hybrid Agent and Its Corrosion Resistance in Acid Environment

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