Development of novel corrosion resistant electroless NI-P composite coatings for pipeline steel

In this research, coatings with various particles contents will be co-deposited within Ni–P deposits on AISI 1012 steel samples by electroless coating process. As a result, structural changes were evaluated, surface and cross-section morphology of composite deposits have been investigated by scanning electron microscopy (SEM), volumetric percentage of co-deposited particles have been determined using EDS analysis system, corrosion resistance of various EN coatings and current density were studied through potentiodynamic polarization, and mechanical properties were evaluated using wear and nano-indentation tests. The results showed that Alumina can give the best compromise between surface smoothness and deposition rate, Titanium can reach the highest levels of volumetric incorporation whereas Carbon can improve further lubrication effect on wear action, finally hardness and corrosion behavior had the best results with the existence of Alumina.