High-temperature corrosion of electric-arc coatings sprayed from powder core wires based on the Fe–Cr–B–Al system

Студент, М. М.; Dzioba, Yu. V.; Hvozdetskyi, V. M.; Pokhmurska, H.; Wielage, B.; Grund, Thomas

doi:10.1007/s11003-009-9131-5

Cited by 15 publications

(6 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Such kinds of alloys including the alumina-forming austenitic (AFA) steels and ferritic Kanthal alloys have been successfully developed for high-temperature thermal applications [40,47]. Besides, these alloys with a high Al content can be considered not only as structural materials but also as coating materials [48][49].…”

Section: Introductionmentioning

confidence: 99%

Molten chloride salts for next generation concentrated solar power plants: Mitigation strategies against corrosion of structural materials

Ding

Shi

Jianu

et al. 2019

Solar Energy Materials and Solar Cells

152

View full text Add to dashboard Cite

Molten chloride salts are promising advanced high-temperature (400-800°C) thermal energy storage (TES) and heat transfer fluid (HTF) materials in next generation concentrated solar power (CSP) plants for higher energy conversion efficiencies. However, severe corrosion of structural materials in contact with molten chloride salts is one of the most critical challenges limiting their applications at elevated temperatures. In this work, two corrosion mitigation strategies are investigated to alleviate the hot corrosion of structural materials in molten chloride salts: (1) adding corrosion inhibitor and (2) using a Fe-Cr-Al alloy with a protective alumina layer on the surface after pre-oxidation. Three commercial high temperature Fe-Cr-Ni alloys (SS 310, Incoloy ® 800 H and Hastelloy ® C-276) were exposed to molten MgCl 2 -NaCl-KCl (60-20-20 mole.-%) mixed salts with 1 wt.-% Mg as corrosion inhibitor, for 500h at 700°C under inert atmosphere. By addition of the Mg inhibitor, the corrosion rates of the studied alloys were found to be significantly reduced, more precisely by ~83 % for SS 310, ~70 % for In 800 H and ~94 % for Ha C-276 compared with the exposure tests without Mg addition. To assess the second mitigation strategy two pre-oxidized alumina forming Fe-Cr-Al alloys were exposed to the same molten chloride salts without Mg corrosion inhibitor under the same conditions. It is observed that the adherent alumina scales can effectively inhibit the dissolution of Cr and Fe and the bulk penetration of corrosive impurities. Overall, both strategies offer enormous potential for enhancing the expected lifetime of commercial alloys in molten chloride salts. Highlights  By Mg-addition the corrosion rates of alloy SS 310, In 800 H and Ha C-276 are significantly reduced. 2  Adding Mg inhibitor not only mitigates the corrosion caused by impurities, but also promotes the formation of protective MgO layer on metal surfaces.  The corrosion mitigation mechanism of Fe-Cr-Ni based alloys in molten chloride salts by adding Mg is discussed. Pre-oxidized alumina forming Fe-Cr-Al alloys show promising corrosion resistance and stability in molten chloride salts at 700°C for 500h exposure.

show abstract

Section: Introductionmentioning

confidence: 99%

Molten chloride salts for next generation concentrated solar power plants: Mitigation strategies against corrosion of structural materials

Ding

Shi

Jianu

et al. 2019

Solar Energy Materials and Solar Cells

152

View full text Add to dashboard Cite

show abstract

“…To determine it, two tubular specimens 50 mm long were used, the ends of which were pressed together by means of a bolted connection (Figure 5) [32]. A coating 1.2 mm thick was sprayed on the outer surface of the thus assembled specimen.…”

Section: Evaluation Of the Cohesive Strength Of Coatingsmentioning

confidence: 99%

Mechanical Properties of Arc Coatings Sprayed with Cored Wires with Different Charge Compositions

et al. 2022

View full text Add to dashboard Cite

The mechanical properties (hardness, cohesion, and residual stresses) of arc coatings designed for operation under conditions of boundary friction and corrosive-abrasive wear are analyzed. The coatings were formed by arc spraying cored wires (CW) with different charge compositions (the content of carbon, aluminum, and boron in CW charge varied). It is shown that the hardness of the coatings increases with an increase in the carbon content in them up to 1 wt. %, and then decreased due to an increase in the content of residual austenite in their structure. The level of residual stresses of the first kind in such coatings increased by four times with an increase in the carbon content to 2 wt. %. The hardness of the coatings and the level of residual tensile stresses in them also increase with a decrease in the aluminum content in them. In this case, the cohesive strength of the coatings increased due to the implementation of aluminothermic reactions in the droplets of the CW melt during their flight and crystallization on the sprayed surfaces. However, then, with an increase in the aluminum content in the coatings of more than 2 wt. %, their cohesive strength decreased. The level of residual tensile stresses in coatings with a high content of retained austenite decreased after heat treatment (tempering) of the specimens. Sometimes, after tempering, these stresses even transformed into residual compressive stresses (in particular, under using CW C1.4Cr14Ni2). At the same time, the tempering of specimens with a predominance of ferrite in the coating structure increased the level of residual tensile stresses in them, which is due to the precipitation of finely dispersed carbides or borides. It has been shown that the addition of boron-containing components (ferrochromium-boron, chromium-boron) to the composition of the CW charge leads to a significant increase in the hardness of the coatings. Thus, an increase in the boron content in coatings from 0 to 4 wt. % leads to an increase in their hardness from 320 HV to 1060 HV. However, this is accompanied by an increase in tensile residual stresses in the coatings and a decrease in their cohesive strength.

show abstract

“…This made it possible to expand the field of application of the ASM method and to obtain new restoration and protective coatings for various functional purposes with higher service characteristics [3][4][5][6][7]. However, arc spraying coatings (ASC) are characterized by high porosity within the range of 3.0% -5.0%, high level of residual tensile stresses, low cohesion and adhesion (compared with coatings obtained by other gas-thermal methods) [8][9][10][11]. Therefore, in recent years, researches, which are directed to improve the physical and mechanical characteristics of coatings, deposited by the ASM method, have been intensified.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Increasing the Air Flow Pressure on the Properties of Coatings During the Arc Spraying of Cored Wires

Студент

Volodymyr

Student

et al. 2019

Strojnícky Časopis - Journal of Mechanical Engineering

View full text Add to dashboard Cite

The melting conditions of the electrode wires and the structure of coatings, obtained by the electric arc spraying method depending on the pressure of the spraying air flow, are analysed in the current paper. The effect of air pressure on the spraying angle of the flow of melted metal droplets is demonstrated. It is established that due to the decrease in this spraying angle, the temperature of the droplets increases. In addition, high-speed airflow is more easily captured by smaller molten metal droplets and during the contact with the substrate surface their deformations were more strongly. Due to such phenomenon, the porosity of the coatings was reduced and the number of lamellae, welded to each other, increased. With the increasing pressure of the air flow, the thicknesses of the lamellae were decreased, however, the amount of the oxide phase in the coatings has increased. As a result, the hardness, wear resistance and cohesive strength of the coatings, obtained at a higher pressure of the air flow, have increased, and the level of residual stresses of the first kind in them decreased.

show abstract

High-temperature corrosion of electric-arc coatings sprayed from powder core wires based on the Fe–Cr–B–Al system

Cited by 15 publications

References 6 publications

Molten chloride salts for next generation concentrated solar power plants: Mitigation strategies against corrosion of structural materials

Molten chloride salts for next generation concentrated solar power plants: Mitigation strategies against corrosion of structural materials

Mechanical Properties of Arc Coatings Sprayed with Cored Wires with Different Charge Compositions

The Effect of Increasing the Air Flow Pressure on the Properties of Coatings During the Arc Spraying of Cored Wires

Contact Info

Product

Resources

About