Corrosion behaviour of plasma sprayed coatings

Çelik, Erdal; Özdemir, İ.; Avci, E.; Tsunekawa, Yoshiki

doi:10.1016/j.surfcoat.2004.08.143

Cited by 97 publications

(56 citation statements)

References 11 publications

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“…[37][38][39][40][41][42] The porosity is a characteristic of plasma sprayed coatings and strongly affects their corrosion behaviours. Generally speaking, the corrosion rate increases with increasing porosity in the coatings.…”

Section: à3mentioning

confidence: 99%

“…Generally speaking, the corrosion rate increases with increasing porosity in the coatings. 41) The electrolyte infiltrates into the inner portion of the coating through the structural imperfections such as pores and cracks or pinholes existing in the coating and comes into contact with the deeper portion of the coating, 42) causing corrosion. The polarization resistance (R p ) obtained can be used to determine the porosity that corresponds simply to the ratio of the polarization resistance of the uncoated substrates and the coated samples.…”

Section: à3mentioning

confidence: 99%

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Effect of Heat Treatment on Characteristics of Plasma Sprayed Hydroxyapatite Coatings

Chen

Ding

2006

Mater. Trans.

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Bioactive hydroxyapatite (HA)-coated implants plasma sprayed on Ti6Al4V substrates have been widely used in load-bearing applications because of their biocompatibility and their intimate contact with bone. The improvement of the characteristics of HA coatings is concerned. The purpose of this work was to evaluate corrosion behavior and bond strength of HA coatings after post-deposition heat treatment at 500-700 C. The results indicated that the heat treatment led to recrystallization of amorphous calcium phosphate of as-sprayed HA coatings. The reduction of layer defects associated with plasma-sprayed coatings and the enhancement of the resistance to corrosion took place after heat treatment. Bond strength of the heat-treated coatings was sensitive to the treatment temperature. It is concluded that the heat treatment at 600C for 1 h in air, endowing with increased crystallinity and the reduced defects without significantly reduced bond strength, provided a better corrosion protection than the other two treatment temperatures.

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Section: à3mentioning

confidence: 99%

Section: à3mentioning

confidence: 99%

Effect of Heat Treatment on Characteristics of Plasma Sprayed Hydroxyapatite Coatings

Chen

Ding

2006

Mater. Trans.

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“…Beside that it is also observed some parts of oxide layer was peel-off from the oxidized samples that may lead to increase the penetration of the solution into the oxide layer which later encourages the local attacks inside the Co-Cr-Mo alloy substrate. This phenomenon is also explained by previous researcher that using different method of surface modification (Celik et al, 2005). In addition, as the solution gets the chance to reach into the bulk material may induce a microgalvanic reaction at the oxide layer-substrate interface which accelerates the corrosion process and peel-off of the oxide layer (Guilemany et al, 2006).…”

Section: Resultsmentioning

confidence: 65%

Thermal oxidation process improved corrosion in cobalt chromium molybdenum alloys

Ayu

Daud²,

Shah³

et al. 2017

Int. j. adv. appl. sci.

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The corrosion phenomena are always give bad impact to any metal products including human implants. This is due to the corrosion impacts are harmful for hard tissues and soft tissues. There are many methods to prevent the process of corrosion on implant materials such as coating with bioceramic materials and modify the implant surface with surface modification techniques. However, until now there is still no gold standard to overcome this problem and it is remain in researching process. Thus, the aim of this research is to investigate the potential and economical surface modification method to reduce the corrosion effects on Cobalt-Chromium-Molybdenum (Co-Cr-Mo) based alloy when insert in human body. The thermal oxidation process was selected to treat Co-Cr-Mo surface substrate. Firstly, Co-Cr-Mo alloy was heated in muffle furnace at constant temperature of 850°C with different duration of heating such as 3 hours and 6 hours in order to analyze the formation of oxide layer. The corrosion behaviours of untreated sample and oxidized sample were investigated utilizing potentiodynamic polarization tests in simulated body fluids (SBF). The Vickers hardness after corrosion testing was measured in order to evaluate the effect of thermal oxidation in reducing corrosion rate. Based on the results obtained it is clearly showed that substrates undergone thermal oxidation with 6 hours duration time performed better than 3 hours duration, with the hardness value 832.2HV vs. 588HV respectively. Dense oxide layer and uniform thickness formed on the oxidized substrates able to help in reducing the corrosion effects on Co-Cr-Mo alloy without degraded its excellent mechanical properties. The microstructures of oxidized substrates before and after corrosion test were also analyzed using FESEM images for better observations. It was determined that corrosion resistance of Co-Cr-Mo substrate can be increased with oxide layer formed on the alloys using thermal oxidation process.

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“…With the high velocity deposition of the coating and after rapid cooling at room temperature, the air diffused from the coating surface resulted in the formation of a splashed zone or pores/defects on the coating surface [27,28]. These splash zones contributed to getting moisture and other aggressive ions from the atmosphere [29,30]. A chemical analysis of the coating is shown in the EDS spectra (Figure 3c).…”

Section: Characterization Of the Arc Thermal Sprayed Coatingsmentioning

confidence: 99%

Corrosion Resistance Properties of Aluminum Coating Applied by Arc Thermal Metal Spray in SAE J2334 Solution with Exposure Periods

Lee

Singh

Ismail

et al. 2016

Metals

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Arc thermal metal spray coating provides excellent corrosion, erosion and wear resistance to steel substrates. This paper incorporates some results of aluminum coating applied by this method on plain carbon steel. Thereafter, coated panels were exposed to an environment known to form stable corrosion products with aluminum. The coated panels were immersed in Society of Automotive Engineers (SAE) J2334 for different periods of time. This solution consists of an aqueous solution of NaCl, CaCl 2 and NaHCO 3 . Various electrochemical techniques, i.e., corrosion potential-time, electrochemical impedance spectroscopy (EIS) and the potentiodynamic were used to determine the performance of stimulants in improving the properties of the coating. EIS studies revealed the kinetics and mechanism of corrosion and potentiodynamic attributed the formation of a passive film, which stifles the penetration of aggressive ions towards the substrate. The corrosion products that formed on the coating surface, identified using Raman spectroscopy, were Dawsonite (NaAlCO 3 (OH) 2 ) and Al(OH) 3 . These compounds of aluminum are very sparingly soluble in aqueous solution and protect the substrate from pitting and uniform corrosion. The morphology and composition of corrosion products determined by scanning electron microscopy and energy dispersive X-ray analyses indicated that the environment plays a decisive role in improving the corrosion resistance of aluminum coating.

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Corrosion behaviour of plasma sprayed coatings

Cited by 97 publications

References 11 publications

Effect of Heat Treatment on Characteristics of Plasma Sprayed Hydroxyapatite Coatings

Effect of Heat Treatment on Characteristics of Plasma Sprayed Hydroxyapatite Coatings

Thermal oxidation process improved corrosion in cobalt chromium molybdenum alloys

Corrosion Resistance Properties of Aluminum Coating Applied by Arc Thermal Metal Spray in SAE J2334 Solution with Exposure Periods

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