Thermal-sprayed Fe-10CM3P-7C amorphous coatings possessing excellent corrosion resistance |
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Authors: | K Kishitake H Era F Otsubo |
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Affiliation: | (1) Department of Materials Science and Engineering, Faculty of Engineering, Kyushu Institute of Technoloy, 804 Kita-Kyushu, Japan |
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Abstract: | An alloy of Fe-10Cr-13P-7C was thermally sprayed by three different processes: (1) 80 kW low-pressure plasma spraying (LPPS),
(2) high-velocity oxyfuel (HVOF) spraying, and (3) 250 kW high-energy plasma spraying (HPS). The as-sprayed coating obtained
by the LPPS process was composed of an amorphous phase. In contrast, the as-sprayed coatings obtained by the HVOF and HPS
processes were a mixture of amorphous and crystalline phases. The as-sprayed coatings showed a high hardness of 700 DPN. A
very fine structure composed of ferrite, carbide, and phosphide was formed, producing a maximum hardness of greater than 1000
DPN in the LPPS coating just after crystallization on tempering. The corrosion re-sistance of the amorphous coating was superior
to a SUS316L stainless steel coating in 1N H2SO4 solution and 1N HC1 solution. Furthermore, the amorphous coating underwent neither general nor pitting corro sion in1NUCI solution and 6% FeCl3 6H2O solution containing 0.05N HCl, whereas the SUS316L stain less steel coating was attacked aggressively. |
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Keywords: | amorphous corrosion resistance crystallization HVOF iron alloy plasma spraying |
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