Evaluation of cavitation/corrosion synergy of the Cr3C2-25NiCr coating deposited by HVOF process

Mayer, André R.; Bertuol, Kaue; Siqueira, Irene B.A.F.; Chicoski, André; Váz, Rodolpho Fernando; Sousa, Milton J. de; Pukasiewicz, Anderson Geraldo Marenda

doi:10.1016/j.ultsonch.2020.105271

Cited by 29 publications

(14 citation statements)

References 41 publications

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“…In this way, the selected area to be coated was the neighborhood of the welded recover, to protect the region where the cavitation/corrosion occurs due to the galvanic pair formed in the interface carbon steel/stainless steel. The synergy cavitation/corrosion is presented by Mayer et al [39], interpreting the effective influence of the corrosion on the cavitation behavior of the material. However, for the remelted coatings, the same region of the severe cavitation erosion was selected, since the alloys FeMnCrSi in the condition of welded presented resistance close to the welded Co alloys [34,47,48] and had higher corrosion resistance than the substrates [49].…”

Section: Results For Thermal Spray Repairmentioning

confidence: 99%

“…The low amount of porosity is important, because it has a severe influence on the cavitation resistance since the mechanism of mass loss by cavitation is related to the lower adhesion between the metallic lamellae in the coating [36]. The higher porosity the lower cohesion in the coatings [39,53]. The microhardness of the coatings, measured in the transversal section was 312±16 HV0.3, which is consonant to the obtained by Pukasiewicz et al [34,47], confirming the replication of the laboratory properties on the in-situ application properties.…”

Section: Resultsmentioning

confidence: 99%

“…Vaz et al [38], using the ASP (Arc Spraying Process), indicated the best standoff distance for FeMnCrSi [33], reaching the highest Kinetic Energy for the particles in flight at 200 mm, with velocity 150 m/s. Mayer et al [39] indicated the synergism between corrosion/cavitation Cr3C2-NiCr alloys, with higher mass loss by cavitation on NaCl solution than on deionized water.…”

Section: Defects and Repairing Of Runnersmentioning

confidence: 99%

See 2 more Smart Citations

Welding and Thermal Spray Processes for Maintenance of Hydraulic Turbine Runners: Case Studies

Váz

Tristante²,

Pukasiewicz

et al. 2021

Soldag. insp.

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Hydraulic runners are susceptible to failures by cracks or wear by erosion, corrosion, or cavitation. The modern runners are fabricated in carbon steel and martensitic stainless steel. Arc welding processes normally do the repair of eroded areas, or cracked parts. Each material or type of repair needs specific criteria, procedures, and precautions to guarantee their success and prevent future issues, like the recurrence of the cracks or reduction of the useful life of the runner by modifications of the original material. Wear-resistant coatings are applied by welding or by thermal spray processes, considering this last one has no metallurgical interaction with the material of the runner, keeping the original properties of the material. For several years the companies Copel GeT, Lactec, UTFPR, and UFPR collaborate on the study of different techniques, methods, and processes to repair hydraulic runners, this work aims to present a short compilation, and examples of some results obtained applied on real runners.

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Section: Results For Thermal Spray Repairmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Defects and Repairing Of Runnersmentioning

confidence: 99%

See 1 more Smart Citation

Welding and Thermal Spray Processes for Maintenance of Hydraulic Turbine Runners: Case Studies

Váz

Tristante²,

Pukasiewicz

et al. 2021

Soldag. insp.

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“…High-velocity oxygen fuel was widely used to reinforce the surface properties because of the advantage of high flame velocity, high spray particle velocity and high kinetic energy [1]. Hence, the piston rod with the Cr 3 C 2 -NiCr coating fabricated by HVOF presented excellent performance in the coal mine, desert, ocean and oil field atmosphere [2][3][4][5][6]. T. Varis [7] et al compared the fatigue performance of Cr 3 C 2 -NiCr coatings by different kerosene and oxygen levels.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of HVOF Cr3C2–NiCr Coating with Different Bonding Layer on the Interactive Behavior of Fatigue and Corrosion

Zhang

Yun

et al. 2022

Coatings

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In order to improve material service life under a fatigue and corrosion coupling environment, a high-velocity oxygen fuel (HVOF) Cr3C2-NiCr coating with a bonding layer was prepared. The objective was to obtain the optimum bonding layer for the HVOF Cr3C2-NiCr coating, which included a laser cladding (LC) Ni625 layer, extreme high-speed laser material deposition (EHLA) Ni625 layer and HVOF NiCr layer. Fatigue properties of the samples with various bonding layers were investigated by means of a four-point bending fatigue test. Electrochemical impedance spectroscopy (EIS) and the salt spray test were executed after the bending fatigue test to simulate the interactive effect of fatigue and corrosion atmosphere. Failure surfaces were characterized by scanning electron microscopy (SEM) and an energy-dispersive spectrometer (EDS) to indicate the details of corrosion products. Corrosive behaviors of samples were adequately demonstrated according to the results, which included the curves of potentiostatic polarization, impedance magnitude and phase degree, and corrosion products. The result showed that the cycles of perforative cracking for the sample with the EHLA Ni625 bonding layer was almost three times than that of the sample with the HVOF NiCr layer. The magnitude of EIS reduced from ~105 to ~103 for the sample after BFT. Eventually, the main improvement mechanism of the HVOF Cr3C2-NiCr coating with the EHLA Ni625 bonding layer was attributed to the grain refinement of the bonding layer and performed a good level of metallurgical bonding with the substrate.

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“…A broad range of materials is deposited via the HVOF method, such as metals, ceramics and composites. Overall, the main application of thermally sprayed coatings is protection against different types of wear [ 10 , 11 , 12 , 13 ], and more sophisticated implementation involves the prevention from cavitation erosion [ 14 , 15 , 16 ]. Besides, industrial applications combine these two deterioration processes, such as pressure values, diesel liners or specialised chemical equipment.…”

Section: Introductionmentioning

confidence: 99%

Effect of Microstructure and Hardness on Cavitation Erosion and Dry Sliding Wear of HVOF Deposited CoNiCrAlY, NiCoCrAlY and NiCrMoNbTa Coatings

Szala¹,

Walczak²,

Świetlicki³

2021

Materials

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Metallic coatings based on cobalt and nickel are promising for elongating the life span of machine components operated in harsh environments. However, reports regarding the ambient temperature tribological performance and cavitation erosion resistance of popular MCrAlY (where M = Co, Ni or Co/Ni) and NiCrMoNbTa coatings are scant. This study comparatively investigates the effects of microstructure and hardness of HVOF deposited CoNiCrAlY, NiCoCrAlY and NiCrMoNbTa coatings on tribological and cavitation erosion performance. The cavitation erosion test was conducted using the vibratory method following the ASTM G32 standard. The tribological examination was done using a ball-on-disc tribometer. Analysis of the chemical composition, microstructure, phase composition and hardness reveal the dry sliding wear and cavitation erosion mechanisms. Coatings present increasing resistance to both sliding wear and cavitation erosion in the following order: NiCoCrAlY < CoNiCrAlY < NiCrMoNbTa. The tribological behaviour of coatings relies on abrasive grooving and oxidation of the wear products. In the case of NiCrMoNbTa coatings, abrasion is followed by the severe adhesive smearing of oxidised wear products which end in the lowest coefficient of friction and wear rate. Cavitation erosion is initiated at microstructure discontinuities and ends with severe surface pitting. CoNiCrAlY and NiCoCrAlY coatings present semi brittle behavior, whereas NiCrMoNbTa presents ductile mode and lesser surface pitting, which improves its anti-cavitation performance. The differences in microstructure of investigated coatings affect the wear and cavitation erosion performance more than the hardness itself.

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Evaluation of cavitation/corrosion synergy of the Cr3C2-25NiCr coating deposited by HVOF process

Cited by 29 publications

References 41 publications

Welding and Thermal Spray Processes for Maintenance of Hydraulic Turbine Runners: Case Studies

Welding and Thermal Spray Processes for Maintenance of Hydraulic Turbine Runners: Case Studies

Comparative Study of HVOF Cr3C2–NiCr Coating with Different Bonding Layer on the Interactive Behavior of Fatigue and Corrosion

Effect of Microstructure and Hardness on Cavitation Erosion and Dry Sliding Wear of HVOF Deposited CoNiCrAlY, NiCoCrAlY and NiCrMoNbTa Coatings

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