Evaluating the Effect of Laser Surface Modification on the
Corrosion Behavior of Ni-P-SiC Electroless Coating
Deposited on Al356 Alloy |
Sayed Hamid Hashemi,a,* Reza Shoja-Razavi,b
Ali Ashrafi,c Mohammad Erfanmaneshb
and Sajjad Khalilic
Pages : 14-20
DOI : 10.1080/0371750X.2022.2150687 |
Abstract |
Regarding their higher wear/corrosion resistance than conventional coatings, nickelphosphorus based composite coatings can reduce components’ costs and
degradation. This study employed laser surface modification of Ni-P-SiC electroless
coatings deposited on Al356 substrate, followed by investigating their microstructural
changes and corrosion behavior. The results showed that increasing the laser power
increases surface defects and causes substrate diffusion to the coating, which
significantly reduces the corrosion resistance of the coating. In contrast, low-power
laser operations can improve the corrosion resistance of Ni-P-SiC composite coatings
by creating stable nickel phosphide phases, more uniform element distribution, and
enhanced SiC particle-substrate coherence. All these factors increase the wear and
corrosion resistance simultaneously.
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