Investigation of the Effect of Chemical and Mechanical Parameters on the Electroplated Zinc Coating on Steel Substrate of st12

This study aimed to investigate the corrosion behavior of zinc nano-crystalline coating on st12 steel substrate by surface mechanical attrition treatment (SMAT) and electroplating process into chloride bath with and without of gelatin. To study the behavior of coatings, they were characterized by using X-ray diffraction, field emission scanning electron microscopy, EDS, potentiodynamic polarization and EIS tests in 3.5 wt. % NaCl solution. The results showed that SMAT process reduced the size of the crystallites and the presence of gelatin caused the induced orientation of Zn deposition so that the grain size in the presence of gelatin and SMAT reached from 55 to 29 nm and the rate of its corrosion reached from 80.8 to 20.1 µA.cm-2.