Preparation of Electrodeposited Foam Fe-Ni Alloy Coating with Low Content of Nickel

Electrodeposited foam iron-nickel alloy coating with low content of nickel was prepared on polyurethane foam which was treated to be conductive.The effects of the electrolyte system and technical parameters on the morphology and corrosion resistance of the alloy coating were investigated.Hull-cell experiments indi-cated that the complexing agent H-1,a binary organic acid,caused obvious widening of the bright area.The grain size of the alloy coatings decreased with increasing temperature and cathodic current density as well.Moreover,both H-1 and MnCl2 contribu-ted to the enhancement of cathodic polarization,while Ni caused positive shift of anodic dissolution peak by about 200 mV and led to increased corrosion resistance of the alloy coating.At the same time,the electrodeposited foam Fe-Ni alloy coating was compact and had a hardness of as much as 770 HV.