INVESTIGATION OF CORROSION RESISTANCE OF ALUMINIZED INTERMETALLIC COATINGS ON ALLOYS OF Fe-Cr-Al SYSTEM

Гуревич, Л. М.; Pronichev, D. V.; Kulevich, V. P.; Слаутин, О. В.; Naumenko, Valentina A.; Kharlamov, V. O.

doi:10.52351/00260827_2023_01_74

Cited by 2 publications

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“…Increase of the coating thickness with saturation temperature rise is connected with more active passing of diffusion processes with temperature rise both in liquid phase (input of a diffusant to the surface of coated sample) and in solid phase (removal of diffusant inside the sample); it explains forming of more thick coatings. The mechanism of forming of Ni-Cu coatings is considered in details in previous researches [10].…”

Section: Resultsmentioning

confidence: 99%

“…The following TCT methods are used: cementation, nitriding, boriding, aluminizing, galvanizing etc. [9][10][11][12]. However, at present time use of these technologies is restricted, except of cementation and nitriding.…”

Section: Introductionmentioning

confidence: 99%

“…This technology allows to obtain defect-free coatings with homogeneous structure on the components with complicated shape, which are fabricated from structural steels, cast irons, hard alloys. It is based on the appearance of isothermal selective mass transfer of coating components, which are solved in liquid-metal solutions (being a transportation medium), and on consequent diffu-sion of these elements in the coating material with forming of solid solutions or chemical compounds [10].…”

Section: Introductionmentioning

confidence: 99%

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Influence of diffusion alloying of structural steels by nickel and copper in the medium of low-melting liquid-metal solutions on their corrosion resistance

Bobylev,

Storozhenko

2023

cisisr

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The paper considered the effect of Ni-Cu-based coatings obtained by diffusion metallization from a medium of low-melting liquid metal solutions on corrosion resistance of structural steels. It was revealed that diffusion saturation of Ni-Cu steels U8, Kh12MF, 40Kh, steel 20 formed diffusion coatings with a thickness of 10-42 μm on their surface. Thickness of the coatings depended on the modes of diffusion saturation and the coated material. It was found out that corrosion resistance of the coated materials increases in the environment of 30 % aqueous HCl and 3 % NaCl solutions with rise of the diffusion saturation temperature. The maximum corrosion resistance was obtained after diffusion saturation at the temperature of 1070 °C. Ni-Cu-based coatings allow to reduce the corrosion rate of steels in the NaCl environment: for the steel U8 by 26.21 times, for the steel Kh12MF by 21.48 times, for the steel 40Kh by 18.46 times, for the steel steel 20 by 13.9 times. Corrosion rate of steels in HCl environment is also reduced: for the steel U8 by 20.23 times, for the steel Kh12MF by 20.06 times, for the steel 40Kh by 17.35 times, for the steel 20 by 11.45 times. It was revealed that chromium-alloyed steels are undergone additional alloying coating with chromium, diffusing from the coated sample, which allows to obtain a minimal corrosion rate in both HCl and NaCl environments. Thus, the corrosion rate of steel Kh12MF after Ni-Cu coating in NaCl was 0.025 g/(m 2 •h), in HCl -0.289 g/(m 2 •h). The highest corrosion rate was detected on the samples made of U8 steel: in NaCl 0.032 g/(m 2 •h), in HCl -0.039 g/(m 2 •h).

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of diffusion alloying of structural steels by nickel and copper in the medium of low-melting liquid-metal solutions on their corrosion resistance

Bobylev,

Storozhenko

2023

cisisr

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“…The high heat resistance of coatings based on iron aluminides [15,16] is determined by the possibility of forming a uniform oxide film of aluminum and certain alloying elements that prevents the diffusion of oxygen to the substrate at high temperatures [17][18][19]. At the same time, the presence of aluminum in the coating contributes to the formation of Al 2 O 3 upon contact with the atmosphere, while the alloying components normalize its α-modification, which is characterized by the highest density and resistance at high temperatures [20][21][22]. Bülbül et al [20] investigated the corrosion resistance of high-alloy steels containing 0.4% C, 29% Cr, and 4-20% Ni in 10% HCl solutions.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Resistance of Fe-Cr-Al Intermetallic Coatings Obtained by Aluminizing

Gurevich,

Pronichev,

Slautin

et al. 2023

Metals

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The growing interest in intermetallic and metal–intermetallic materials and coatings is based on the number of favorable properties they possess, primarily mechanical. However, the lack of data on their corrosion resistance has largely limited their scope of application. In this study, the corrosion destruction mechanisms of coatings formed on substrates made of AISI 321 steel and Aluchrom W (fechralloy) were investigated. The coatings were created by alloying in an aluminum melt followed by diffusion annealing to form the ultimate intermetallic structure. Corrosion resistance was studied under cyclic exposure to a humid marine atmosphere simulator and potentiostatic tests in an aqueous NaCl solution. Corrosion destruction parameters were determined, and mechanisms for each type of coating were revealed. The conducted studies allowed us to determine the electrochemical parameters of the corrosion destruction process and its mechanisms. It was shown that the corrosion rates during potentiostating for coatings on substrates Cr15Al5 and 12Cr18Ni10Ti differed by almost twofold. Two different mechanisms of corrosion are proposed. The first is associated with the formation of Al2O3 and MgO oxide films, which at the initial stage protect only local areas of the coating surface on Cr15Al5. The second is determined by the diffusion of titanium atoms during annealing to the coating surface on a 12Cr18Ni10Ti steel substrate with the formation of TiC carbide at the grain boundaries.

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INVESTIGATION OF CORROSION RESISTANCE OF ALUMINIZED INTERMETALLIC COATINGS ON ALLOYS OF Fe-Cr-Al SYSTEM

Cited by 2 publications

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Influence of diffusion alloying of structural steels by nickel and copper in the medium of low-melting liquid-metal solutions on their corrosion resistance

Influence of diffusion alloying of structural steels by nickel and copper in the medium of low-melting liquid-metal solutions on their corrosion resistance

Corrosion Resistance of Fe-Cr-Al Intermetallic Coatings Obtained by Aluminizing

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