G.A.G. Pedroza, C.A.C. de Souza
In this study the effect on the deposition efficiency and corrosion resistance of Zn–Ni electrodeposits after the addition of formic acid (0.03 to 0.53 mol/L) to the plating bath is investigated. The corrosion resistance was evaluated in an aerated solution of 2.0 mol/L NaOH and 0.5 mol/L NaCl using weight loss tests and electrochemical measurements, including potentiodynamic polarization curves and electrochemical impedance spectroscopy. The addition of formic acid to the chemical bath enhanced the corrosion resistance of the Zn–Ni deposit in both solutions. Above 0.07 mol/L formic acid added to the solution, corresponding to pH 3.0, the corrosion rate does not vary significantly. Improved corrosion resistance, attributed to the addition of 0.07 mol/L formic acid, was found in deposits obtained from chemical baths at the same pH. Furthermore, the addition of formic acid produced an enhancement in the efficiency of galvanostatic deposition when the pH was maintained around 3.0. It was observed that the addition of formic acid modifies the microstructure of the Zn–Ni deposit due to the formation of the Ni5Zn21 intermetallic phase.
@article{b24b7763-9f5b-4b19-9381-b4b0a006db47,
title={Influence of formic acid on the microstructure and corrosion resistance of Zn–Ni alloy coatings by electrodeposition},
author={G.A.G. Pedroza and C.A.C. de Souza},
year={2014},
language={en}
}TY - JOUR TI - Influence of formic acid on the microstructure and corrosion resistance of Zn–Ni alloy coatings by electrodeposition AU - G.A.G. Pedroza AU - C.A.C. de Souza PY - 2014 LA - en ER -
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