Corrosion properties of HVOF cermet coatings with bond coats in an aqueous chloride environment

Lekatou, A.; Zois, D.; Grimanelis, D.

doi:10.1016/j.tsf.2007.07.130

Cited by 28 publications

(23 citation statements)

References 25 publications

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“…(1) Stage 1 (−454 to −326 mV vs. Ag/AgCl): The active stage of the polarization curves has been generated from the preferential dissolution of Co -since Co is more prone to oxidation than WC [12,52] -at preferential sites, which will be shown in Section 3.3.5.1. The active stage ends with a sharp decrease in the rate of current increase suggesting that electrochemical reactions no longer control the corrosion rate.…”

Section: Potentiodynamic Polarizationmentioning

confidence: 99%

“…The majority of the research efforts on HVOF spraying of cermets on Al-alloys deal with the fatigue (mainly) [40][41][42][43][44][45][46] and wear performance [43,[47][48][49][50] of the coated alloys and they refer to microcrystalline coatings. The works dealing with the corrosion behaviour of HVOF cermet coatings on Alalloys are also relatively few [12,47,49,[51][52][53][54][55], whilst they also refer to microcrystalline coatings. These works have produced quite encouraging results regarding the application potential of hardmetal coatings on Al-alloys.…”

Section: Introductionmentioning

confidence: 99%

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A comparative study on the microstructure and surface property evaluation of coatings produced from nanostructured and conventional WC–Co powders HVOF-sprayed on Al7075

Lekatou

Sioulas

Karantzalis

et al. 2015

Surface and Coatings Technology

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Section: Potentiodynamic Polarizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A comparative study on the microstructure and surface property evaluation of coatings produced from nanostructured and conventional WC–Co powders HVOF-sprayed on Al7075

Lekatou

Sioulas

Karantzalis

et al. 2015

Surface and Coatings Technology

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“…To protect the coated parts against corrosion, the bond coat preventing the corrosive solution to interact directly with the metallic substrate are often used, even if the ceramic thermal spray coatings are often corrosion resistant as far as the coating material are concerned (Al, Cr, etc.) [13,14]. Comparing the benefits and costs of the evaluated coatings, not only the service performance should be considered [15].…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Thermally Sprayed Coatings Under Different Types of Wear Conditions for Hard Chromium Replacement

et al. 2011

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The tribological properties of part surfaces, namely their wear resistance and friction properties, are decisive in many cases for their proper function. To improve surface properties, it is possible to create hard, wear-resistant coatings by thermal spray technologies. With these versatile coating preparation technologies, part lifetime, reliability, and safety can be improved. In this study, the tribological properties of the HVOF-sprayed coatings WC-17%Co, WC-10%Co4%Cr, WC-15% NiMoCrFeCo, Cr 3 C 2 -25%NiCr, (Ti,Mo)(C,N)-37%NiCo, NiCrSiB, and AISI 316L and the plasma-sprayed Cr 2 O 3 coating were compared with the properties of electrolytic hard chrome and surface-hardened steel. Four different wear behavior tests were performed; the abrasive wear performance of the coatings was assessed using a dry sand/ rubber wheel test according to ASTM G-65 and a wet slurry abrasion test according to ASTM G-75, the sliding wear behavior was evaluated by pin-on-disk testing according to ASTM G-99, and the erosion wear resistance was measured for three impact angles. In all tests, the HVOF-sprayed hardmetal coatings exhibited superior properties and can be recommended as a replacement for traditional surface treatments. Due to its tendency to exhibit brittle cracking, the plasma-sprayed ceramic coating Cr 2 O 3 can only be recommended for purely abrasive wear conditions. The tested HVOF-sprayed metallic coatings, NiCrSiB and AISI 316L, did not have sufficient wear resistance compared with that of traditional surface treatment and should not be used under more demanding conditions. Based on the obtained data, the application possibilities and limitations of the reported coatings were determined.

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“…Corrosion resistance of HVOF carbide coatings is important factor determining possibility of applications in different environments [17][18][19]. Potentiodynamic polarization corrosion method was applied to evaluate HVOlF sprayed WC-12Co coatings.…”

Section: Corrosion Resistancementioning

confidence: 99%

Mechanical Properties and Corrosion Resistance of HVOF Sprayed Coatings Using Nanostructured Carbide Powders

Żórawski

Makrenek

Góral

2016

Archives of Metallurgy and Materials

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Nanostructured and composite WC-12Co coatings were prepared by means of the supersonic spray process (HVOF). The microstructure and composition of WC-12Co nanostructured powder were analyzed by scanning electron microscope (SEM) and transmission electron microscope (TEM). Investigations revealed nano grains of WC with the size in the range of 50-500 nm. The nanostructured sprayed coating was analysed by SEM and phase composition was investigated by X-ray diffractometer (XRD). A denser coating structure with higher hardness was observed compared to conventional coating with a small amount of W2C, WC1−x, W and some amorphous phase. Young’s modulus and hardness were determined by depth sensing indentation in HVOF sprayed WC-12Co nanostructured coatings. Results were compared to conventional coatings and the relevance of the nanostructure was analyzed. An indentation size effect was observed on the polished surface and cross-section of both coatings. Data provided by indentation tests at maximum load allow to estimate hardness and elastic modulus. Enhanced nanomechanical properties of conventional coating in comparison to nanostructured one were observed. Nanostructured coatings WC-12Co (N) revealed significantly better corrosion resistance.

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Corrosion properties of HVOF cermet coatings with bond coats in an aqueous chloride environment

Cited by 28 publications

References 25 publications

A comparative study on the microstructure and surface property evaluation of coatings produced from nanostructured and conventional WC–Co powders HVOF-sprayed on Al7075

A comparative study on the microstructure and surface property evaluation of coatings produced from nanostructured and conventional WC–Co powders HVOF-sprayed on Al7075

Comparative Study of Thermally Sprayed Coatings Under Different Types of Wear Conditions for Hard Chromium Replacement

Mechanical Properties and Corrosion Resistance of HVOF Sprayed Coatings Using Nanostructured Carbide Powders

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