Formation and structure evaluation of optimized slurry aluminide coating by nickel-cobalt electroplating layer on nickel-base superalloy

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Masoumi Balashadehi Mohammad Reza; SABOUR ROUHAGHDAM ALIREZA; Allahyarzadeh Bidgoli Mohammad Hossein

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Journal: IRANIAN JOURNAL OF SURFACE SCIENCE AND ENGINEERING Year:2020 | Volume:- | Issue:42 Page(s): 49-59

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Title

Formation and structure evaluation of optimized slurry aluminide coating by nickel-cobalt electroplating layer on nickel-base superalloy

Author(s)

Masoumi Balashadehi Mohammad Reza | SABOUR ROUHAGHDAM ALIREZA | Allahyarzadeh Bidgoli Mohammad Hossein | Issue Writer Certificate

Keywords

Hastelloy-XQ1

Nickel-Cobalt electroplatingQ1

Diffusion aluminide coatingQ1

SlurryQ1

Abstract

In this research, formation and structure evaluation of optimized Slurry aluminide coating by applying a pre-coating of Ni/Ni-Co electroplated layer on Ni-base superalloy were studied. First, some pure Ni and Ni– 45Co (at. %) layers were deposited on Ni-base superalloy, Hastelloy-X, samples separately by electroplating process at the specified conditions and 22-23 μ m thickness. Subsequently, the Slurry aluminizing process was carried out on the pre-plated and a not-plated samples via the specified heat treatment. The obtained coatings with 142-148 μ m thickness were investigated by X-ray diffractometer and scanning electron microscope equipped by energy-dispersive X-ray spectroscope, and elemental mapping. According to the obtained results, β-NiAl desirable phase in all three samples and β-CoAl in the Ni-Co pre-plated sample were formed, definitely. The pre-plated layer reduced the diffusion of Cr and Fe, up to 4. 5 times of magnitude and Mo, up to 2. 5 times of magnitude to the upper parts of coatings by forming a diffusion barrier state. Present Ni in the pre-plated layer decreased the consumption of present Ni in the substrate alloy, too. Accordingly, the composition of substrate alloy in the pre-plated samples was less affected by diffusion coating process. Also, the present Co in the pre-plated layer of the Ni-Co pre-plated sample increased its amount, up to 7 times of magnitude in upper parts of the coating. This subject improved the possibility of formation of cobalt aluminide phases which confirmed by the formation of β-CoAl in upper parts of the coating.

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APA: Copy

Masoumi Balashadehi, Mohammad Reza, SABOUR ROUHAGHDAM, ALIREZA, & Allahyarzadeh Bidgoli, Mohammad Hossein. (2020). Formation and structure evaluation of optimized slurry aluminide coating by nickel-cobalt electroplating layer on nickel-base superalloy. IRANIAN JOURNAL OF SURFACE SCIENCE AND ENGINEERING, -(42 ), 49-59. SID. https://sid.ir/paper/393035/en

Vancouver: Copy

Masoumi Balashadehi Mohammad Reza, SABOUR ROUHAGHDAM ALIREZA, Allahyarzadeh Bidgoli Mohammad Hossein. Formation and structure evaluation of optimized slurry aluminide coating by nickel-cobalt electroplating layer on nickel-base superalloy. IRANIAN JOURNAL OF SURFACE SCIENCE AND ENGINEERING[Internet]. 2020;-(42 ):49-59. Available from: https://sid.ir/paper/393035/en

IEEE: Copy

Mohammad Reza Masoumi Balashadehi, ALIREZA SABOUR ROUHAGHDAM, and Mohammad Hossein Allahyarzadeh Bidgoli, “Formation and structure evaluation of optimized slurry aluminide coating by nickel-cobalt electroplating layer on nickel-base superalloy,” IRANIAN JOURNAL OF SURFACE SCIENCE AND ENGINEERING, vol. -, no. 42 , pp. 49–59, 2020, [Online]. Available: https://sid.ir/paper/393035/en

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