| dc.description.abstract | Low carbon steel is a metal material that is often used for structural applications and piping systems in the industrial world. This is because low carbon steel has good mechanical properties, is relatively inexpensive, and is easy to work
with. However, low carbon steels have low resistance to oxidation and corrosion at high temperatures and are inflexible. Therefore, to increase resistance to oxidation and
corrosion at high temperatures it is necessary to provide a coating of the carbon steel
material.
In this study, FeCrAlTiY - MCrAlY (M = Co and Ni) powder was successfully deposited on a low carbon steel substrate using flame spray and Spark Plasma Sintering (SPS) techniques. The carbon steel coating technique is carried out by steps, (1) coating using the flame spray technique using compressed air, (2) coating using the
flame spray technique using nitrogen gas carrier, (3) coating using the Spark Plasma technique. Sintering (SPS). To determine the resistance of the FeCrAlTiY - MCrAlY (M = Co and Ni) layer to high temperatures, oxidation and corrosion tests were carried out at 700oC for 24 hours for 8 cycles. Phase characterization of the sample both before and after the oxidation test was carried out using X-ray diffraction (XRD) and the microstructure of the sample was observed using a scanning electron microscope (SEM) equipped with an energy dispersive X-ray spectrometer (EDX) to determine the distribution of elements in the sample.
Low carbon steel powder coated with FeCrAlTiY- xMCrAlY (M = Co and Ni, x = 0, 10, 20, and 30% mass) with a flame spray technique using compressed air has been carried out to obtain the optimal composition. Based on the results of the research, prior to oxidation of carbon steel coated with FeCrAlTiY it resulted in a phase of coated carbon steel (Fe,Cr), Fe(Cr,Al)2O4 and FeO; and carbon steel coated with FeCrAlTiY produces carbon steel phases coated with FeCrAlTiY-xMCrAlY to produce (Fe,Cr), (Ni,Co) Cr2O4, Fe(Cr,Al)2O4 and FeO phases. After oxidation of the carbon steel, the Fe2O3 phase; carbon steel coated with FeCrAlTiY produces phases of
carbon steel coated with Fe2O3; and carbon steel coated with FeCrAlTiY produced a phase of carbon steel coated with FeCrAlTiY- xMCrAlY to produce Fe2O3 and
Fe(Cr,Al)2O4 phases. The Al2O3 or Cr2O3 phases were not detected by X-ray diffraction in coating with FeCrAlTiY - MCrAlY because most of the Al and Cr elements had been oxidized during the coating process. Based on the mass gain curve after oxidation, it is
found that the optimal composition (the best composition) is the FeCrAlTiY –
30%MCrAlY layer. Coating optimization is further carried out by flame spray technique using nitrogen gas carrier and Spark Plasma Sintering (SPS).
Low carbon steel coated with FeCrAlTiY- 30%MCrAlY powder with a flame spray technique using nitrogen nitrogen gas carrier is done to minimize the oxide formed during coating preparation. Based on the research results, prior to oxidation and corrosion, carbon steel coated with FeCrAlTiY- 30%MCrAlY formed (Fe,Cr), (Ni,Co) Cr2O4, Fe(Cr,Al)2O4 and FeO phases. Oxides and spinels are still formed using nitrogen, because the elements when the coating occurs are oxidized. But if seen from
the results of the peak oxide formed in the coated sample using air compressor, it is higher than using nitrogen as a carrier gas (nitrogen carrier gas). After the oxidation test was carried out, the (Fe,Cr), Fe2O3, Al2O3, (Ni,Co)Cr2O4 phases were produced.
After the corrosion test was carried out, the Fe2O3, Al2O3, Fe(Cr,Al)2O4 phases were produced. Low carbon steel coated with FeCrAlTiY- 30%MCrAlY powder with the Spark Plasma Sintering (SPS) technique was carried out to suppress the production of oxides formed during the preparation of the coating process. Based on the research results, prior to oxidation and corrosion, carbon steel coated with FeCrAlTiY- 30%
MCrAlY formed NiAl, FeNi, (Co,Ni), and (Fe,Cr) phases. After the oxidation test was carried out, the NiAl, FeNi, (Co,Ni), and (Fe,Cr) phases were produced. After the
corrosion test was carried out, the NiAl, FeNi, (Co,Ni), (Fe,Cr), Fe2O3 and Al2O3
phases were produced. Based on the FeCrAlTiY - 30% MCrAlY coating mass gain curve Based on the mass gain curve of carbon steel coated with FeCrAlTiY - 30%
MCrAlY with a flame spray technique using nitrogen gas carrier and Spark Plasma
Sintering (SPS) effectively increases oxidation and corrosion resistance of carbon steel
and in corrosion tests and in corrosion tests The first 24 hours the mass gain rate increased rapidly, which was due to the presence of a 20% NaCl solution that was sprayed on the surface of the substrate, thus accelerating the corrosion process. | en_US |
