The Effects of Current Density to Surface Morphology and Corrosion Resistance of Bright Ni-Fe Alloy Coating

Bright Ni-Fe alloy coating was prepared using electrodeposited method.The microstructures of the alloy coating was determined by scanning electron microscope(SEM);the phase compositions of the alloy coating was analyzed by X-ray diffraction(XRD);and immersion corrosion testing was then done on the alloy coating to observe the corrosion behavior and corrosion rate.The results show that the corrosion rate of alloy coating in 3.5% NaCl solution is slower than in 5% H_2SO_4 solution,and the better corrosion resistance is manifested in 3.5% NaCl solution.The smallest rate of corrosion is 0.21(mg/(dm~2·h)),and alloy coatings have a better corrosion resistance in each of solution when current density is 4～6 A/dm~2.