Eletrodeposição e caracterização da liga NiFe (10) e NiFe (25).

Abstract

The process of electrodeposition of alloys and a significant study in the treatment of surfaces. The deposition of two metals in an alloy consists of uniting distinct properties in a single material. The chemical characteristics of metal nickel, sometimes do not exceed the economic factor of using it, so the need to combine the characteristics of Ni (nickel) with a less noble metal, such as Fe (iron), forming a NiFe alloy. For a reference base in proportion to the electrolytic bath, the Watts bath was used and by replacing a percentage of nickel salt by an iron salt, the NiFe baths (10) and (25) have been established. The electrolytes used in the deposit of this alloy were salts simple. An acid pH of 2.4, 2.5 and 4.1 was used due to the desired deposit. SEMs have shown the occurrence of granular formation in all coatings, with larger grains in coatings containing Fe, with a better distribution of the grains in the NiFe alloy (10). A superficial view of the deposit presented semi-glossy appearance and full coverage of the subtrate The composition wt% final obtained in the deposition of the two alloys was Ni89, iiFeio, 89 for NiFe alloy (10) and Ni75,4iFe24,59 for NiFe alloy (25). The corrosion test in the middle of 0.1M NaCI presented a more positive potential for NiFe alloy (10), as well as resistance to polarization, with values ​​closer to the values ​​of the pure Ni coating, thus, the NiFe alloy (10), in these conditions, presents a better result for use against the corrosion process.