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High-temperature oxidation-resistant NiCr/Al duplex coating on carbon steel substrate
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The oxidation resistance property of NiCr/Al duplex coating system has been evaluated at 800oC during retention times of 1.5; 3; 4.5 and 6 hours. After the oxidation test, SEM-EDS data indicated the diffusion of aluminum into the NiCr coating, whereas XRD patterns revealed the appearance of new phases (Al3Ni2, Al2O3). In addition, an increase in micro-hardness (up to 518 - 842 Hv) was obtained after oxidation test. These obtained findings indicated that NiCr/Al coating had higher oxidation resistance than NiCr coating.
Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
Title: High-temperature oxidation-resistant NiCr/Al duplex coating on carbon steel substrate
Description:
The oxidation resistance property of NiCr/Al duplex coating system has been evaluated at 800oC during retention times of 1.
5; 3; 4.
5 and 6 hours.
After the oxidation test, SEM-EDS data indicated the diffusion of aluminum into the NiCr coating, whereas XRD patterns revealed the appearance of new phases (Al3Ni2, Al2O3).
In addition, an increase in micro-hardness (up to 518 - 842 Hv) was obtained after oxidation test.
These obtained findings indicated that NiCr/Al coating had higher oxidation resistance than NiCr coating.
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