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

Yuan, Kun; Peng, Ru Lin; Li, Xinhai; Johansson, Sten

doi:10.1016/j.vacuum.2015.09.015

Cited by 43 publications

(12 citation statements)

References 23 publications

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“…Figure 3(b) shows the morphology of CoCrAlYTaSi coating cross-section. A clear bonding line was observed between the coating and the substrate, the structure grew perpendicular to the interface, which improved its wear resistance in a corrosive environment (Liu et al, 2018;Yuan et al, 2015).…”

Section: Characterization Of Cocralytasi Coating 321 Morphologies and X-ray Diffraction Analysis Of Coatingmentioning

confidence: 99%

Corrosive wear and electrochemical corrosion behaviors of laser thermal sprayed CoCrAlYTaSi coatings in 3.5 Wt.% NaCl solution

Weitong

Dejun

2019

ACMM

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Purpose This paper aims to enhance the corrosive wear and electrochemical corrosion of Ti–6Al–4V alloy. Design/methodology/approach A CoCrAlYTaSi alloy coating was fabricated on Ti–6Al–4V alloy using a laser thermal spraying (LTS). The surface and cross-section morphologies, chemical elements, phases and bonding strength of the obtained coating were analyzed using a scanning electron microscope, energy dispersive spectroscope, X-ray diffraction and scratch test, respectively, The corrosive wear and electrochemical corrosion of CoCrAlYTaSi coating in 3.5 Wt.% NaCl solution were investigated using a wear tester and electrochemical workstation, respectively. Findings The average coefficient of frictions (COFs) of CoCrAlYTaSi coating under the wear loads of 2, 4 and 6 N are 1.31, 1.02 and 0.88, respectively; and the corresponding wear rates are 0.66 × 10−4, 1.10 × 10−4 and 1.30 × 10−4 mm3·N–1·m–1, respectively. The wear mechanism under the wear load of 2 N is abrasive wear, while those under the wear loads of 4 and 6 N are adhesive wear and abrasive wear. The charge transfer resistance of CoCrAlYTaSi coating is 5.368 × 105 Ω·cm2, higher than 2.193 × 105 of the substrate. Originality/value In this study, a CoCrAlYTaSi coating was firstly fabricated on Ti–6Al–4V alloy using a LTS. Its corrosive wear and electrochemical corrosion in 3.5 Wt.% NaCl solution were investigated, which played a protective role of corrosive wear on Ti–6Al–4V alloy.

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Section: Characterization Of Cocralytasi Coating 321 Morphologies and X-ray Diffraction Analysis Of Coatingmentioning

confidence: 99%

Corrosive wear and electrochemical corrosion behaviors of laser thermal sprayed CoCrAlYTaSi coatings in 3.5 Wt.% NaCl solution

Weitong

Dejun

2019

ACMM

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“…MCrAlY coatings have been widely employed as bond coatings because of their low cost and good oxidation property [26][27][28][29][30]. These coatings contain an approximately 50% volume fraction of β precipitates served as Al reservoirs, enabling formation of a dense Al 2 O 3 layer to resist the oxygen-gas penetration at high temperatures [26,31].…”

Section: Thermal Barrier Coatingsmentioning

confidence: 99%

Performance of High-temperature Coatings : Oxidation and Interdiffusion

Sun

2023

Linköping Studies in Science and Technology. Licentiate Thesis

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The use of aluminiferous coatings profoundly improves the service life of superalloys but leads to the microstructural degradation of superalloys and thus the loss of mechanical properties. To solve this trade-off, two strategies were employed in this research. At first, we modified MCrAlY coatings by inducing Ta to reduce the interdiffusion effect on substrate alloys. This strategy was verified by 2000 h/1100 °C oxidation tests in two Ta-containing MCrAlY-IN792 systems. The system with 3.3 wt.% Ta MCrAlY displays an outstanding resistance to γ′ depletion in the substrate and comparable oxidation property in comparison with a reference system of Ta-free MCrAlY-IN792. Increasing Ta to 7.4 wt.% results in reduced oxidation resistance. Thermodynamic simulations revealed the phase-Prof. Ru Lin Peng, for her infinite enthusiasm and support, valuable discussions and constructive comments. And I have learned a lot from her rigorous science cogitation. Secondly, I want to thank my co-supervisor Dr.Xin-Hai Li, from Siemens Industrial Turbomachinery AB and Prof. Johan Moverare for providing the valuable guidance and fruitful discussions. Special thanks are addressed to Pimin Zhang and Kang Yuan, former PhDs from our division, who have done outstanding jobs as a good guidance for my following research. My thanks also go to my collaborators from Charmers University, Dr. Xiaolong Li and Pr. Sheng Guo, who have prepared materials for our project. And I want to thank all my colleagues in Engineering Materials for their kind help during the study. Sincerely, appreciate our head of division, Mattias Calmunger for his warm concern, Jinghao and Rodger for their supporting in my oxidation experiments.

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“…In order to know more about the research progress of anticorrosion coatings, the detailed statistical classification of the adopted techniques in the literature were carried out. The statistical data were derived from 94 kinds of coatings in more than 60 literature contributions, − all of which focused on the corrosion-resistant coatings in the range of 400–900 °C. Therefore, it can be considered that these coatings have the potential for corrosion resistance in power plants.…”

Section: Corrosion-resistant Coatings To Protect Heat Transfer Tubesmentioning

confidence: 99%

“…Relative proportions of various technologies used in bench-scale corrosion resistance, on the basis of 94 kinds of coatings in more than 60 literature contributions. − …”

Section: Corrosion-resistant Coatings To Protect Heat Transfer Tubesmentioning

confidence: 99%

Application of Coatings to Alleviate Fireside Corrosion on Heat Transfer Tubes during the Combustion of Low-Grade Solid Fuels: A Review

et al. 2020

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To address the energy and environmental issues related to the use of traditional fossil fuels, the thermal utilization of low-grade solid fuels such as low-rank coal, biomass, and municipal solid waste has gradually attracted much attention. During the combustion of the low-grade solid fuels, one of the major operation problems is the fireside corrosion on heat transfer tubes, which easily causes the frequent replacement of tubes and shutdown of boilers, largely reducing the energy and economic performances. In this review, the causes and mechanisms of corrosion were first clarified to provide a basis for mitigating the losses induced by the fireside corrosion, followed by the introduction of the preparation and properties of coatings, which show great potential to resist the invasion of corrosive species by attaching the reinforced surface to the tubes. To demonstrate the feasibility of the coating for hightemperature corrosion resistance, 94 kinds of coatings in more than 60 literature contributions were statistically analyzed. It was found that over 90% of anticorrosion coatings were prepared from thermal spraying techniques, and approximately three-quarters of the anticorrosion coatings were made of NiCr-based alloys. Many methods were reported to evaluate the corrosion resistance of coatings in literature, including mass gain/loss method, ash deposition method, contact angle method, and ash adhesion method. As for exploring the anticorrosion mechanisms of coatings, it was found that the protection was achieved by the formation of dense oxide scale, such as Cr 2 O 3 , NiO, MoO 2 , and so on. Furthermore, the application status of coatings in power plants was also summarized. According to the pilot-scale tests listed in literature, the obvious similarity is that the adopted technologies were mainly High velocity oxy-fuel (HVOF) spraying or cold spraying techniques, with almost all of the coated materials being NiCr-based alloys as well as a small portion of Fe/Co-based alloys. This indicates that the NiCr-based coatings prepared by HVOF spraying technique have been widely applied in power plants. In order to promote the large-scale application of anticorrosion coatings, it is prospective to focus on several key research aspects: (1) predicting the corrosion conditions from fuel compositions, (2) developing costeffective coatings, (3) establishing the systematic evaluation methods by laboratory tests, (4) achieving in-depth understanding of the anticorrosion mechanisms, and (5) conducting a comprehensive economic analysis.

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

Cited by 43 publications

References 23 publications

Corrosive wear and electrochemical corrosion behaviors of laser thermal sprayed CoCrAlYTaSi coatings in 3.5 Wt.% NaCl solution

Corrosive wear and electrochemical corrosion behaviors of laser thermal sprayed CoCrAlYTaSi coatings in 3.5 Wt.% NaCl solution

Performance of High-temperature Coatings : Oxidation and Interdiffusion

Application of Coatings to Alleviate Fireside Corrosion on Heat Transfer Tubes during the Combustion of Low-Grade Solid Fuels: A Review

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