The Effect of the Amount of Ferrous Sulfate in the Electrolyte on the Hardness of the Ni-Fe Alloy Coating Generated by Electrical Deposition Method

Nickel-iron alloy coatings with different amounts of ferrous sulfate in plating bath on steel substrate under turbulence ۲۵۰ rpm and current density ۲.۵ A d-۱m-۲ were created. the amount of ferrous sulfate added to the plating bath varied from ۲۰ g l-۱ to ۸۰ g l-۱. EDX test was taken from each sample. the amount of iron that precipitated from each plating solution in the alloy coating was obtained. it was observed that for the values ​​of ۲۰ g l-۱, ۴۰ g l-۱, ۶۰ g l-۱, ۸۰ g l-۱ iron sulfates ۲۱.۲۹(wt.%), ۴۳.۳۵(wt.%), ۵۱.۱۹(wt.%), ۵۸.۸(wt.%) iron were deposited in the alloy coating, respectively. According to the SEM photos obtained from the samples, it was observed that only the sample contains ۲۰ g l-۱ ferrous sulfates in the plating bath without cracks and increasing the amount of ferrous sulfate in the plating bath leads to an increase in internal stresses in the coating, which is the main reason creating cracks. Finally, the hardness of the coatings was obtained, which was the highest hardness for the ۲۰ g l-۱ sample.

Keywords:

Nickel-Iron Alloy , Ferrous Sulfate , Microhardness , Electroplating , Coating