In situ coating of low carbon steel with Ni\Al\Fe powder mixture via mechanical alloying

چکیده مقاله

In this work mechanical alloying (MA) was used for coating lowcarbon steel with Ni, Al and Fe powder mixture. Milling was done for 2, 4, 8 and 12 h. After milling, coated sampleswere annealed at 550 °C for 2 h. Phase analysis and microstructure of formed coatings were studied via X-ray diffraction (XRD) method and scanning electron microscopy (SEM), respectively. Microhardness and corrosion behavior of coated sampleswere also investigated. The results showed that complete formation of iron aluminide and nickel aluminide is possible after enough mechanical alloying and subsequent annealing. According to SEMimages, 8 h milling results in a coating with 65 μm thickness andwithout any cracks unlike 12 h milled sample. Microhardness and corrosion current density of low carbon steel was measured 200 HV and 5.49 × 10−6 A/cm2 and improved to 930 HV and 3.16 × 10−8 A/cm2, respectively for 8 h mechanically alloyed and annealed sample.