KCl-Induced High Temperature Corrosion Behavior of HVAF-Sprayed Ni-Based Coatings in Ambient Air

Jafari, Reza (author): Tarbiat Modares University, Department of Material Science and Engineering, Tehran, Iran

Sadeghimeresht, Esmaeil, 1985- (author): Högskolan Väst,Avdelningen för avverkande och additativa tillverkningsprocesser (AAT),PTW

Shahrabi Farahani, Taghi (author): Tarbiat Modares University, Department of Material Science and Engineering, Tehran, Iran

Markocsan, Nicolaie, 1967- (author): Högskolan Väst,Avdelningen för avverkande och additativa tillverkningsprocesser (AAT),PTW

Joshi, Shrikant V., 1960- (author): Högskolan Väst,Avdelningen för avverkande och additativa tillverkningsprocesser (AAT),PTW

(creator_code:org_t)

2018-01-02
2018
English.
In: Journal of thermal spray technology (Print). - : Springer Science and Business Media LLC. - 1059-9630 .- 1544-1016. ; 27:3, s. 500-511

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Abstract Subject headings

KCl-induced high temperature corrosion behavior of four HVAF-sprayed Ni-based coatings (Ni21Cr, Ni5Al, Ni21Cr7Al1Y, and Ni21Cr9Mo) under KCl deposit has been investigated in ambient air at 600°C up to 168h. The coatings were deposited onto 16Mo3 steel - a widely used boiler tube material.Uncoated substrate, 304L and Sanicro25 were used as reference materials in the test environment.SEM/EDS and XRD techniques were utilized to characterize the as-sprayed and exposed samples.The results showed that the small addition of KCl significantly accelerated degradation to the coatings. All coatings provided better corrosion resistance compared to the reference materials. The alumina-forming Ni5Al coating under KCl deposit was capable of forming a more protective oxide scale compared to the chromia-forming coatings as penetration of Cl through diffusion paths was hindered. Both active corrosion and chromate formation mechanisms were found to be responsible for Page 1 of 23ASM the corrosion damages. The corrosion resistance of the coatings based on the microstructure analysis and kinetics had the following ranking (from the best to worst): Ni5Al >Ni21Cr> Ni21Cr7Al1Y>Ni21Cr9Mo.

TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Bearbetnings-, yt- och fogningsteknik (hsv//swe)
ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Manufacturing, Surface and Joining Technology (hsv//eng)
TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Metallurgi och metalliska material (hsv//swe)
ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Metallurgy and Metallic Materials (hsv//eng)
TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Kompositmaterial och -teknik (hsv//swe)
ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Composite Science and Engineering (hsv//eng)

By the author/editor: Jafari, Reza; Sadeghimeresht, ...; Shahrabi Farahan ...; Huhtakangas, Mat ...; Markocsan, Nicol ...; Joshi, Shrikant ...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Materials Engine ...; and Manufacturing Su ...

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Materials Engine ...; and Metallurgy and M ...

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Materials Engine ...; and Composite Scienc ...

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