Influence of deposition temperature on the corrosion resistance of electrodeposited zinc‐nickel alloy coatings

Abstract

Zinc-nickel alloy coatings are electrodeposited on carbon steel from chloride bath using a technique of chronopotentiometry at different temperatures. The elemental composition and surface morphology analysis of zinc-nickel coated samples are done using scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy. The coated samples are immersed in 3.5 wt.% sodium chloride solution and measurements of corrosion rate are done using linear polarization resistance. Scanning electron microscopy results show that deposition temperature variation has a strong effect which changes the surface morphology and elemental composition of zinc-nickel alloy coatings. The nickel content in the electrodeposited zinc-nickel alloy coatings increases with increasing deposition temperature. Uniformity and compactness of the coatings decrease with an increasing temperature. Cracks intensity increases with increasing deposition temperature which is attributed to internal stress due to factors that might be related to hydrogen evolution reaction. The linear polarization resistance results correlated with the morphology and compositional properties of zinc-nickel alloy coatings deposited at different temperatures, that with an increase deposition temperature, corrosion resistance decreases. Zinc-nickel alloy coatings with high corrosion resistance, compact and uniform morphology with less crack, and nickel content within the range of 12 wt.% to 15 wt.% are achieved with deposited coating at 25 8C.

Investigation of Zn/Ni-Based Electrocatalysts for Electrochemical Conversion of CO2to SYNGAS

“…The corrosion resistance of deposited Zn-Ni coatings on steel substrate indicated as having the acceptable corrosion property (corrosion rate: ~ 11 mm/year) was reached for Zn-Ni alloys in the range from 12 to 15 wt.% of Ni content in the coating so that the coating with Ni content from 12 to 15 wt.% maintains the anodic behavior of the steel, retaining the sacrificial behavior with a decrease corrosion rate after the addition of Ni, which increases the potential nearer to the substrate providing protection for a too time [21]. This has been endorsed by reports conducted by other authors [22][23][24][25] who have stated that Zn-Ni coating with a Ni amount of 12 to 15 wt.% supplies adequate corrosion protection. While the coating retains its sacrificial behavior regarding the steel substrate, whenever the alloy with more than 30 wt.% of Ni turns nobler than the substrate, missing its sacrificial behavior.…”

“…In recent years, a lot of research has been performed to investigate the possibility that the Zn-Ni alloy could be a substitute with a corrosion property corresponding to the toxic coatings of cadmium. Much research has also been done to distinguish and determine the corrosion resistance of the Zn-Ni coatings [22][23][24][25]. The corrosion resistance of deposited Zn-Ni coatings on steel substrate indicated as having the acceptable corrosion property (corrosion rate: ~ 11 mm/year) was reached for Zn-Ni alloys in the range from 12 to 15 wt.% of Ni content in the coating so that the coating with Ni content from 12 to 15 wt.% maintains the anodic behavior of the steel, retaining the sacrificial behavior with a decrease corrosion rate after the addition of Ni, which increases the potential nearer to the substrate providing protection for a too time [21].…”

“…The coatings of Zn-Ni coating with 10-15 wt.% of Ni have more suitable corrosion resistance, better weldability, and superior formability. The presence of Ni in the Zn-Ni alloy in the optimal range from 12 to 15 wt.% reduces the rate of Zn dissolution, supplying greater and longer corrosion resistance than pure Zn [24].…”

Zinc-nickel alloy coatings: electrodeposition kinetics, corrosion, and selective dissolution. A review

“…В работе [89] было проведено исследование влияния температуры (в интервале от 25 до 70 °С) на электроосаждение и противокоррозионную эффективность цинк-никелевых покрытий, синтезированных из аммиачно-хлоридного электролита, которое показало, что лучшей морфологией и наиболее низкой плотностью коррозионного тока характеризуется покрытие, полученное при температуре 25 °С.…”

Fabricating the Superhydrophobic Nickel and Improving Its Antifriction Performance by the Laser Surface Texturing

“…Therefore, nickel-plated surface treatment is usually used to improve the surface properties of the material [21,22]. However, the wear resistance of the pure nickel layer is much lower than that of the nickel-based multiple plating layer [23]. Hadipour [24] studied that the wear resistance of the nickel coatings that were produced by magnet stirrer process at 2 A/dm 2 and rotating disk cathode process at 4 A/dm 2 were lower than the other coatings.…”