Nickel Corrosion Inhibition in Sulfuric Acid—Electrochemical Studies, Morphologies, and Theoretical Approach

Abstract

The inhibition performance of three selected dihydrazide derivatives, namely, malonic acid (MAD), succinic acid (SAD), and adipic acid (AAD) dihydrazide, was tested in relation to nickel corrosion in 1.0 M sulfuric acid (H2SO4) solution. Electrochemical methods (Tafel polarization, linear polarization resistance [LPR], and electrochemical impedance spectroscopy [EIS]) were used, complemented with scanning electron microscopy/energy-dispersive x-ray (SEM/EDX) examinations. Computational studies were also used to confirm experimental findings and to optimize the adsorption structures of dihydrazide derivatives. Results showed that the three tested dihydrazides inhibited Ni corrosion (mixed-type inhibitors) to an extent, depending on the type and concentration of the introduced inhibitor. SEM studies revealed that the corroded areas on the surface were decreased in the presence of additives to an extent, depending on the type and concentration of the tested inhibitor. Results obtained from electrochemical measurements are in good agreement with theoretical studies.

Effect of Cu Addition on the Electrochemical Corrosion Performance of Ni3Al in 1.0 M H2SO4

“…Additionally, pure nickel displayed an anodic Tafel slope of 71 mV/decade. The anodic Tafel slope determined for the pure Ni in the present work is in agreement with the reported one by Amin et al [36], who studied the inhibition of corrosion of Ni exposed to 1.0 M H 2 SO 4 solution; the authors observed that, for the Ni electrode without inhibitor, a linear relation was observed between potential and log( ) in the active dissolution region, with an apparent anodic Tafel slope of 67 mV/decade. It is worth noting that the chemical composition of passive films is very important in defining the corrosion resistance [37].…”

“…This behavior is consistent with that observed in LPR measurements. Generally, the anodic dissolution of Ni in acid solutions involves uniform dissolution with the following reaction path (which considers the water adsorption process in the mechanism of electrooxidation) [36,42]: NiOH + H…”

Corrosion inhibition of C-steel in acidic media from fruiting bodies of Melia azedarach L extract and a synergistic Ni2+additive

“…Potentiodynamic polarization measurements were carried out in the direction from the cathode to the anode at a scan rate of 10 mV s À1 . 18,19 A Meinsberger potentiostat/galvanostat with PS6 soware was used for the polarization measurements.…”

Effect of Temperature on the Corrosion Resistance of Ni5Al Coating Deposited by Electric Arc in 3.5% NaCl Solution

“…The evolution of both the OCP and Rp values is due to the anodic and cathodic processes that occur on the surface of the coating. In general, it can be said that the anodic dissolution is due to the occurrence of the following reactions [10,[26][27][28][29][30]:…”