Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7994050 | Journal of Alloys and Compounds | 2018 | 11 Pages |
Abstract
This work reports the development of a novel bilayered ZnNi/NiCoSiC nanocomposite coating on mild steel (MS) by electrodeposition. The top Ni-Co-SiC nanocomposite layer, when deposited directly on MS (monolayer) shows a hardness of 734â¯HV and a corrosion current density of â¼28μA/cm2 in 3.5â¯wt% NaCl. However, the lack of adherence of the coating with MS results in poor wear and scratch resistance. Mild steel is anodic to NiCoSiC nanocomposite and any kind of discontinuity in the coating may lead to severe galvanic corrosion. This problem has been successfully overcome with the incorporation of an anodic (with respect to mild steel)Zn12%Ni under-layerin between the electrodeposited NiCoSiC nanocomposite coating and MS, which is adherent to both the materials. This bilayer coating has a hardness of 760â¯HV and corrosion current density of â¼19μA/cm2 in 3.5â¯wt% NaCl which are slightly better than that of the monolayer. Further, the bilayer coating assembly exhibits exceptionally low volume loss under wear (â¼350â¯mm3) compared to bare mild steel (â¼1700â¯mm3). This ZnNi/NiCoSiC nanocomposite bilayercoating has the potential to emerge as hard, wear resistant and anti-corrosive coating which is essential in the field of heavy duty machines.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Saptarshi Das, Swastika Banthia, Arghya Patra, Srijan Sengupta, Shiv Brat Singh,