Study on Heat Transfer Performance and Anti-Fouling Mechanism of Ternary Ni-W-P Coating

Ren, Longfang; Cheng, Yanhai; Yang, Jinyong; Wang, Qingguo

doi:10.3390/app10113905

Cited by 15 publications

(5 citation statements)

References 55 publications

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“…Electroless plating is a type of surface treatment in which a thin layer of metals, salts or other compound is plated without the use of external power. This electroless deposition occurs as a result of a redox reaction between the metal and the reducing agent, e.g., hypophosphite, leading to the reduction and subsequent deposition of metallic ions on the surface [77][78][79][80][81]. The wide application of electroless plating is due to the uniformity regardless of the shapes and size of the surface, low porosity and roughness, high adhesion of these coatings to the substrate, and the excellent corrosion, wear, and abrasion and fouling resistance [81,82].…”

Section: Electroless Plating Methodsmentioning

confidence: 99%

A Review on Geothermal Heat Exchangers: Challenges, Coating Methods, and Coating Materials

Bhuvanendran Nair Jayakumari,

Malik,

Mittal

et al. 2023

Coatings

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Geothermal energy is likely to be a significant contributor in achieving sustainable energy goals and net-zero emissions targets. Within geothermal power plants, heat exchangers play a critical role in harnessing this renewable energy source. However, these heat exchangers encounter significant challenges when exposed to geothermal fluids, including erosion, corrosion, and scaling, which adversely affects their performance and longevity. The current review focuses on surface engineering techniques, particularly coatings, as a highly effective and economically viable solution to address these challenges in geothermal heat exchangers. The review begins by providing an overview of geothermal energy, its significance in the context of sustainability and the important role played by heat exchangers in geothermal power generation, followed by the challenges and their impact on heat exchangers. The subsequent section focuses on surface engineering by coatings and its types employed to enhance the performance of heat exchangers. In the final part, the reader is presented with an overview of the challenges associated with the application of coatings in geothermal heat exchangers and potential future directions in this field. This review offers a detailed understanding of the critical role coatings play in improving the efficiency and service life of heat exchangers in geothermal power plants.

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Section: Electroless Plating Methodsmentioning

confidence: 99%

A Review on Geothermal Heat Exchangers: Challenges, Coating Methods, and Coating Materials

Bhuvanendran Nair Jayakumari,

Malik,

Mittal

et al. 2023

Coatings

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“…In this stage, the fouling amount of CaCO 3 was dynamically changing. Because the vortex and shear force formed when the fluid flowed over the sample surface has a direct effect on both the fouling rate and the desorption rate of the crystals, due to the effect of fluid shear force, the CaCO 3 crystals adhered to the sample surface are dislodged, and the amount of fouling shows an apparent irregular variation [25]. After 492 h dynamic fouling experiment, the ratio of fouling induction period time of the three samples was 1:1.86:2.43, the ratio of the maximum fouling amount of CaCO 3 was 6.25:2.60:1, and the ratio of average fouling rate in the growth period was 7.02:2.47:1.…”

Section: Fig 8 Variation Of Sample Fouling Amount With Timementioning

confidence: 99%

Characterization of Water-Based Anti-Corrosion and Anti-Fouling Coating in the Heat Exchanger Tube of Gas Water Heater

WANG,

WU,

YUAN

et al. 2024

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Due to the fouling and corrosion issues with gas water heater heat exchangers during use, a water-based coating is created using the sol-gel method and applied to the inner surface of the copper tube of the heat exchangers. The water-based coating can reduce the surface energy of copper that is oxygen-free by 82.40 % and has outstanding hydrophobicity. The coating's adhesion strength was 8.46 MPa, and its wet adhesion reduction rate was only 0.0375 MPa·d-1 when submerged in a bath of water at a constant temperature. Its water contact angle remained above 110° even after being abraded by sandpaper, demonstrating its excellent wear resistance. At a constant temperature of 45 °C, the corrosion experiment was carried out in salt, acid, and alkali solutions. The maximum corrosion rate of the coating was 3.24 × 10-2mg∙(cm2∙h)-1, which was only 20.85 % of that of the oxygen-free copper substrate. The dynamic fouling experiment shows that the coating can effectively inhibit fouling growth, prolong the fouling induction period and reduce the average fouling rate. By factoring in the fouling thermal resistance and the coating thermal resistance, the overall heat transfer coefficient of the copper tube was computed. The results demonstrate that after applying this water-based coating, the copper tube can continue to have a high heat transfer coefficient for an extended period, ensuring the continuous and effective operation of the heat exchanger and having practical application value.

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“…At higher magnification, denser and smoother connections between cells can be observed, and significantly fewer defects can be observed. This can be attributed to the formation of a saturated interstitial solid solution with Ni as the solvent atom upon introducing W, where W and P elements dissolve into the Ni lattice, filling the gaps or interstitial positions [26]. Furthermore, the addition of W can lower the stacking fault energy and induce boundary relaxation, inhibiting atomic diffusion along the grain boundaries, causing the composition of the grain boundary region to deviate from the equilibrium state, and enhancing the structural stability in these regions [27].…”

Section: Sample Characterization Of the Ni-w-p Coatings Co-deposited ...mentioning

confidence: 99%

Investigation on corrosion resistance of electroless Ni-W-P coatings co-deposited with SiO₂ nanoparticles

Li,

Lv,

Zhou

et al. 2024

Surf. Topogr.: Metrol. Prop.

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The corrosion of materials in sea environment are generally caused by salt spray, tidal action and adhesion of marine organisms. It is necessary to ensure the materials possess the required strength and good corrosion resistance during operation. Although the existing Ni-W-P electroless plating can provide a certain degree of corrosion protection, its corrosion resistance is still limited under harsh marine condition. SiO2 nanoparticles have received extensive concern due to their excellent corrosion resistance, which has been considered as potential candidates for enhancing corrosion resistance in multicomponent electroless coatings. In this study, the electroless Ni-W-P coatings with SiO2 nanoparticles co-deposition on the Q235 substrate was prepared. The coating was characterized through scanning electron microscopy (SEM), X-ray diffraction (XRD), polarization techniques, and electrochemical impedance spectroscopy (EIS). As a result, the Ni-W-P coating co-deposited with SiO2 nanoparticles demonstrates superior corrosion resistance compared to the pure Ni-W-P coating. The surface of SiO2 nanoparticles contain three distinct bonded hydroxyl functional groups, which can influence the ionic reaction in the plating solution and the deposition of elements in the coating. After modified by PVA, it can be uniformly dispersed in the coating, and the composite coating with SiO2 nanoparticles co-deposited is transformed into a nanocrystalline structure. The even distribution of SiO2 nanoparticles fill the defects within the coating, leading to a reduction in porosity, permeability, and susceptibility to penetration of corrosive media. Concurrently, the nanoparticles facilitate surface passivation, forming a stable interface with substrate and coating that inhibits electrochemical reactions and diminishes the rate of self-corrosion reactions. The good and stable corrosion resistance is achieved at the SiO2 concentration of 9 g/L and PVA concentration of 1.08 g/L. These findings offer valuable insights for addressing corrosion challenges in the field of marine engineering.

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Study on Heat Transfer Performance and Anti-Fouling Mechanism of Ternary Ni-W-P Coating

Cited by 15 publications

References 55 publications

A Review on Geothermal Heat Exchangers: Challenges, Coating Methods, and Coating Materials

A Review on Geothermal Heat Exchangers: Challenges, Coating Methods, and Coating Materials

Characterization of Water-Based Anti-Corrosion and Anti-Fouling Coating in the Heat Exchanger Tube of Gas Water Heater

Investigation on corrosion resistance of electroless Ni-W-P coatings co-deposited with SiO₂ nanoparticles

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Study on Heat Transfer Performance and Anti-Fouling Mechanism of Ternary Ni-W-P Coating

Cited by 15 publications

References 55 publications

A Review on Geothermal Heat Exchangers: Challenges, Coating Methods, and Coating Materials

A Review on Geothermal Heat Exchangers: Challenges, Coating Methods, and Coating Materials

Characterization of Water-Based Anti-Corrosion and Anti-Fouling Coating in the Heat Exchanger Tube of Gas Water Heater

Investigation on corrosion resistance of electroless Ni-W-P coatings co-deposited with SiO2 nanoparticles

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Investigation on corrosion resistance of electroless Ni-W-P coatings co-deposited with SiO₂ nanoparticles