کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5368257 | 1388388 | 2010 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Microstructure and corrosion properties of thick WC composite coating formed by plasma cladding Microstructure and corrosion properties of thick WC composite coating formed by plasma cladding](/preview/png/5368257.png)
The thick Ni-coated WC coatings, in a matrix of Nickel-based alloys, were prepared on AISI 1045 steel using plasma cladding equipment. A pre-placed layer of uniform mixture, with different weight fractions of Ni-coated WC powder and Nickel-based alloy powder, on the steel substrate was melted at the high temperature of the plasma jet. The coating composition, microstructure and microhardness were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectrometer (EDS) and microhardness testing. The experimental results show that the metallurgical bond was formed between the coating and substrate. The XRD results show that the coatings contain γ-Ni, carbides (such as M23C6 and M7C3) and boride (such as Fe2B, Fe3B phases). SEM shows that all the coatings are crack-free with lower porosity (<1%). It is found that the microhardness and the electrochemical behavior of the coatings are depended on the content of Ni-coated WC powder. The corrosion mechanism for the coatings may be due to the microgalvance corrosion between the phases in the cladding coatings.
Journal: Applied Surface Science - Volume 256, Issue 21, 15 August 2010, Pages 6354-6358