Influence of Heat Treatment and Sealing on Hot Corrosion Behavior of 80Ni-20Cr Coatings

Singh, Harkulvinder; Chatha, Sukhpal Singh; Sidhu, Hazoor Singh

doi:10.1007/s11666-019-00912-x

Cited by 5 publications

(2 citation statements)

References 32 publications

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“…The pore sealing rate and corrosion resistance enhancement of inorganic sealing agents are usually lower than that of organic sealing agents, but have excellent high-temperature resistance, and can significantly improve the hardness and wear resistance of the coating. For example, in plasma sprayed Al 2 O 3 coating, the corrosion gain in 750 • C molten salt is only half of the spray coating, with excellent high-temperature corrosion resistance [19]; and by improving the coating hardness and the cohesive strength, reduces the wear rate of the coating [20].…”

Section: Introductionmentioning

confidence: 99%

Study on the Corrosion Resistance of Supersonic Plasma Spraying Al2O3 Thin Layer and SiO2 Sealer Alternately Deposited Coating

Feng,

Liu,

Jia

et al. 2024

Coatings

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The longevity of thermally sprayed ceramic coatings is often difficult to achieve in corrosive environments. In this paper, an alternating sealing coating technology was used to seal supersonic plasma sprayed Al2O3 coatings. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to characterize the coating microstructure of Al2O3 coatings and seal coats. The corrosion behavior of alternating sealing coating, traditional sealed coating, and spray coating at 5 wt.% NaCl was studied by the electrochemical test method (dynamic polarization) and immersion corrosion experiments. The results show that the alternating sealing coating is better in preventing the production of through holes and hindering the inward diffusion of corrosive media than traditional sealed coatings, and further increases the thickness of the sealing layer. Compared with the traditional sealing coating, the porosity of alternating sealing coating is decreased by 70.5%, the corrosion potential is increased by 74 mV, and the corrosion current density is decreased by about 78%, which confers better long-term corrosion resistance.

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Section: Introductionmentioning

confidence: 99%

Study on the Corrosion Resistance of Supersonic Plasma Spraying Al2O3 Thin Layer and SiO2 Sealer Alternately Deposited Coating

Feng,

Liu,

Jia

et al. 2024

Coatings

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show abstract

“…At present, the main components of the sealing agent used in the industry to seal the hole of the anodic oxide layer of aluminum oxide are dichromate or nickel salt. These two sealing agents are minimal because of their non-environmentally friendly components, such as Cr 6+ and Ni 2+ [9][10][11][12][13]. Relevant scholars increasingly favor the development of non-toxic, harmless, and environmentally friendly sealing agents.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Corrosion Resistance of Anodic Oxide Films through Zirconium and Titanium Salts Composite Sealing Process: An Optimization and Morphological Study

Yang,

Huang

et al. 2023

Preprint

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In this paper, zirconium and titanium are used as the main components of a sealing agent to seal composite holes. The effects of zirconium content, titanium content, pH, time, and temperature on the sealing effect of the oxide film in the environmentally friendly zirconium salt and titanium salt composite sealing process are studied by the orthogonal experiment and response surface method. The optimization results show that the best sealing conditions of the composite salt are: ammonium fluotitanate 6.0 g/L, ammonium fluozirconate 6.0 g/L, pH 4.0, and sealing time 20 min. The sealing temperature is 35°C. After analyzing the micro-morphology and surface elements of the oxide film sealed by composite salt, the authors found that the porous structure of the oxide film surface obviously disappeared after sealing, and the oxide film surface after sealing was mainly composed of Zr, Ti, O, Al, and other elements.

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Recent Advancements in Sealants Solutions for Surface Coatings: A Comprehensive Review

Pandiyarajan,

Nunthavarawong

2024

J Bio Tribo Corros

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Influence of Heat Treatment and Sealing on Hot Corrosion Behavior of 80Ni-20Cr Coatings

Cited by 5 publications

References 32 publications

Study on the Corrosion Resistance of Supersonic Plasma Spraying Al2O3 Thin Layer and SiO2 Sealer Alternately Deposited Coating

Study on the Corrosion Resistance of Supersonic Plasma Spraying Al2O3 Thin Layer and SiO2 Sealer Alternately Deposited Coating

Enhancing Corrosion Resistance of Anodic Oxide Films through Zirconium and Titanium Salts Composite Sealing Process: An Optimization and Morphological Study

Recent Advancements in Sealants Solutions for Surface Coatings: A Comprehensive Review

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