Electrochemical Corrosion Behavior of High Velocity Oxy-Fuel (HVOF) Superalloy Coatings On Ductile Irons

Year 2019, Volume: 23 Issue: 2, 291 - 300, 01.04.2019

Yusuf Kayalı Muhammet Karabaş Yılmaz Yalçın , Aysel Büyüksağiş , Şükrü Talaş

https://doi.org/10.16984/saufenbilder.465631

Cited By: 3

Abstract

In this study, alloyed and unalloyed ductile irons
(DI) were coated with two different Ni-based superalloy materials by HVOF
method. Microstructure and phase analyzes of the coatings were performed by
using SEM, EDX, XRD methods.  The
electrochemical corrosion behavior of alloyed and unalloyed DI is investigated
in 3.5% (w / v) NaCl solution. As a result of the characterization studies, it
was observed that a dense non-porous coating layer of about 80 μm thickness was
obtained on the cast iron samples and continuous adhesion was provided between
the coating and the substrate. It has been determined that the cast iron coated
with AMDRY 9624 contains γ and β intermetallic phases and the coating produced
with AMDRY 9951 commercial powder contains only γ phase. As a result of coating
process, the corrosion rate of the alloyed and unalloyed spherical graphite
cast irons is reduced. Also, the corrosion rate of the coating produced with
AMDRY 9951 is higher than the coating produced with AMDRY 9624. The presence of
intermetallic phases in the coating produced with AMDRY 9624 increased the
corrosion resistance of the coatings.

Keywords

HVOF, Ductile Iron, Electrochemical Methods

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