Influence of HVOF parameters on the corrosion resistance of NiWCrBSi coatings

Gil, Linda; Staia, M.H.

doi:10.1016/s0040-6090(02)00815-5

Cited by 77 publications

(35 citation statements)

References 12 publications

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“…Corrosion behavior of an HVOF Ni based self-fluxing alloy NiWCrBSi coatings in a chloride solution has been studied by Gil & Staia [55]. Since anticorrosion coatings must be impermeable to protect steel structures in corrosive environments optimization of deposition conditions must be determined.…”

Section: Corrosion and Oxidation Resistant Hvof Coatingsmentioning

confidence: 99%

Optimization and Characterization of High Velocity Oxy-fuel Sprayed Coatings: Techniques, Materials, and Applications

et al. 2011

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Abstract:In this work High Velocity Oxy-fuel (HVOF) thermal spray techniques, spraying process optimization, and characterization of coatings are reviewed. Different variants of the technology are described and the main differences in spray conditions in terms of particle kinetics and thermal energy are rationalized. Methods and tools for controlling the spray process are presented as well as their use in optimizing the coating process. It will be shown how the differences from the starting powder to the final coating formation affect the coating microstructure and performance. Typical properties of HVOF sprayed coatings and coating performance is described. Also development of testing methods used for the evaluation of coating properties and current status of standardization is presented. Short discussion of typical applications is done.

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Section: Corrosion and Oxidation Resistant Hvof Coatingsmentioning

confidence: 99%

Optimization and Characterization of High Velocity Oxy-fuel Sprayed Coatings: Techniques, Materials, and Applications

et al. 2011

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“…The online diagnostic techniques supplemented with other measurement tools have significantly facilitated the development of process maps for HVOF process optimization. These experimental investigations studied the effect of operating parameters including gun type, fuel type, feedstock type and size, combustion pressure, fuel/ oxygen ratio, spray distance on the particle temperature, velocity, melting ratio, oxidant content and the resulting coating microstructure, porosity, hardness, wear abrasion, and corrosion resistance (e.g., Ref 3,28,34,[48][49][50]61,62,65,71,[81][82][83][84][85][86][87][88][89][90][91][92]. The experimental studies have been supplemented by CFD modeling efforts (Ref 10-13, 15-21, 23), which provide fundamental understanding of the gas dynamics, particle in-flight, and impact.…”

Section: Control Of Hvof Thermal Spraymentioning

confidence: 99%

Modeling and Control of High-Velocity Oxygen-Fuel (HVOF) Thermal Spray: A Tutorial Review

Christofides

2009

J Therm Spray Tech

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This work provides a tutorial overview of recent research efforts in modeling and control of the high-velocity oxygen-fuel (HVOF) thermal spray process. Initially, the modeling of the HVOF thermal spray, including combustion, gas dynamics, particle in-flight behavior, and coating microstructure evolution is reviewed. The influence of the process operating conditions as predicted by the fundamental models on particle characteristics and coating microstructure is then discussed and compared with experimental observations. Finally, the issues of measurement and automatic control are discussed and comments on potential future research efforts are made.

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“…The quality of the coating splat boundaries performed an important role in corrosive environments in HVOF coatings [11][12][13]. Coating B0 had the lowest porosity and intersplat oxides thus had the best splat boundary quality, and got the least attack from the hot corrosion environment forming the thinnest aluminadominant oxide layer and having the least spinel amount.…”

Section: Discussionmentioning

confidence: 99%

“…HVOF process creates typical splat-on-splat structure in the coatings, and the coatings' performance, especially in a corrosive environment, can be strongly influenced by such structure. Some investigations showed that the splat boundary was usually the weakest part in corrosive environments since the corrosion generally started from the defects like pores, inclusions and cracks at the splat boundaries [11][12][13]. Some other researches further suggested that one may improve the corrosion resistance of the HVOF coatings by reducing the amount of those intersplat defects through adjusting the parameters in the thermal spraying process or operating some pre-testing heat treatments [11,12,14].…”

Section: Introductionmentioning

confidence: 99%

Hot corrosion behavior of HVOF-sprayed CoNiCrAlYSi coatings in a sulphate environment

Yuan

Peng

et al. 2015

Vacuum

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Abstract.HVOF-sprayed CoNiCrAlYSi coatings were tested at 900 °C in a hot corrosion environment containing sodium-potassium sulphates. The HVOF spraying caused the typical splat-on-splat structure. The results after the hot corrosion testing showed that the corrosion preferentially occurred at the coating surface and the splat boundaries. The oxidation along the splat boundaries can isolate the splat from the underlying coating matrix. In those isolated splats or coating parts, internal oxidation and nitridation of Al took place, following that the Al-depleted coating fragments were then oxidized to spinels. For those coatings which had a worse splat boundary quality (i.e. with higher porosity and intersplat oxides) or had a worse coating surface quality (i.e. with more small coating fragments therefore more interfaces), heavier corrosion attack was observed on those coatings due to the corrosion of the splats or the coating fragments.The results indicated that the as-sprayed coating quality including porosity and surface morphology was important for the hot-corrosion resistance of the coatings.2

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Influence of HVOF parameters on the corrosion resistance of NiWCrBSi coatings

Cited by 77 publications

References 12 publications

Optimization and Characterization of High Velocity Oxy-fuel Sprayed Coatings: Techniques, Materials, and Applications

Optimization and Characterization of High Velocity Oxy-fuel Sprayed Coatings: Techniques, Materials, and Applications

Modeling and Control of High-Velocity Oxygen-Fuel (HVOF) Thermal Spray: A Tutorial Review

Hot corrosion behavior of HVOF-sprayed CoNiCrAlYSi coatings in a sulphate environment

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