Comparison and Evaluation of Nickel Boron Electroless Corrosion Behavior at Different Thicknesses on Copper Substrate

Researchers and industries have considered Electroless nickel boron coatings due to their appropriate corrosion and wear properties. In this study, the effect of thickness on corrosion behavior of the nickel-boron electroless coating was evaluated before and after heat treatment. The coating was performed in three different thicknesses of ۴۰, ۲۰ and ۶۰ micrometers. The samples were heat treated at ۴۵۰ ° C for one hour. Scanning electron microscopy was used to evaluate the coating surface. Potentiodynamic polarization and electrochemical impedance spectroscopy tests were used to study the corrosion behavior. The results showed that the coated sample with a thickness of ۴۰ microns after heat treatment shows better corrosion behavior than other samples. SEM images obtained from the surface of produced coatings showed the larger cauliflower-type structure having better corrosion behavior due to fewer grain boundaries.

Keywords:

Nickel-boron electrodes , corrosion properties , coating thickness , coating morphology , الکترولس نیکل بور , خواص خوردگی , ضخامت پوشش , مورفولوژی پوشش