Fe-Ni ALLOY ELECTRODEPOSITION FROM SIMPLE AND COMPLEX TYPE SULFATE ELECTROLYTES CONTAINING Ni/Fe RATIO OF 1 AND 12

Abstract

Iron-nickel (Fe-Ni) alloy electrodeposition has been conducted from simple and complex baths having Ni/Fe ratio of 1 and 12. The applied current density varies from 30 to 100 mA/cm2. The coating composition, morphology and microhardness are measured and characterized by SEM/EDX and Shimadzu microhardness tester. The percentage of Ni in the coating increases with increasing current density and the Ni/Fe ratio of electrolytes which is supported by the alloy deposition principle. Fine grained and smooth coating without microcracking is obtained from the complex baths. Complexing agents are supposed to reduce the deposit stress developed during electrodeposition. Increase in Ni/Fe ratio in the bath as well as current density results in decreasing grain size of the deposits. High current density is believed to give rise to a high degree of adatoms at the electrode surface and high degree of adatoms decreases the grain size. Microhardness of the coating increases with the increase of bath Ni/Fe ratio as well as current density of electrodeposition. DOI: http://dx.doi.org/10.3329/jme.v44i1.19498

Development of electro-co-deposited Ni–Fe(Ti,W)C nanocomposite coatings

“…Therefore, Fe in the Ni-matrix causes replacement of a component of Ni-matrix composite coating by a cost-effective material. Literature survey also reveals that a variety of particulates such as SiC, TiO 2 , Al 2 O 3 and TiC have been added to the electroplating baths to form metal composite coatings [45,46]. Also, the strength and corrosion resistance can be significantly enhanced by introducing second phase ceramic particles into the Ni-Fe matrix [46,47].…”

Normal Electrochemical Deposition NiFe

“…Summing up the results of the analysis of chemical characteristics of hydrolysis of ferric chloride, it should be noted that researchers in over 65 years [2] conducted NiFe alloy plating and receive preferential deposition of iron in relation to nickel in all formulations electrolyte. Electrolytes used [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] is characterized by a wide range of molar relationship of nickel and iron. The cause of the anomalous codeposition of preferential deposition of iron sources previously not associated with the main feature of iron ionsthe existence of variable Valence iron one and two values in the charge of ions during the hydrolysis of iron salts.…”

Effect of Laser on Abnormal Reduction Process and Properties Evaluation of Electrodeposited Soft Magnetic Fe-Ni Coating

“…The continuous variation of the duty cycle between 90% and 20% resulted in a multilayer structure with alternating 28 Wt% Fe and 55 Wt% Fe, and the elemental variation brought about a significant increase in the microhardness, shear strength and wear resistance of the coatings. M. Moniruzzaman 15 et al found that the Ni content in the coating increased with the increase of current density and Ni content in the bath, which made the grain size decrease and the microhardness increase. Although changing the ECD parameters can cause changes in elemental content and properties, the electrodeposited layer usually suffers from defects such as pinholes, pits and cracks due to the influence of hydrogen evolution, 16 which limits the further improvement of Fe-Ni coatings.…”