Effect of Nickel Content on the Corrosion Resistance of Iron-Nickel Alloys in Concentrated Hydrochloric Acid Pickling Solutions

Nabeel Alharthi,S Zein El Abedin,El-Sayed M Sherif,Hany S Abdo

doi:10.1155/2017/1893672

Nabeel Alharthi, S Zein El Abedin + Show 2 more

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https://doi.org/10.1155/2017/1893672

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Abstract

The effect of Ni content on the resistance against corrosion of Fe-36% Ni and Fe-45% Ni alloys in 1 M hydrochloric acid pickling solution was reported. Various electrochemical and spectroscopic techniques such as potentiodynamic cyclic polarization (CPP), open-circuit potential (OCP), electrochemical impedance spectroscopy (EIS), potentiostatic current-time (PCT), and scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS) have been employed. CPP measurements indicated that the corrosion current and corrosion rate recorded lower values for the alloy that had higher nickel content. OCP curves proved that the presence of high Ni content shifts the absolute potential to the positive potential direction. EIS results revealed that the surface and polarization resistances were much higher for the alloy with higher Ni content. PCT curves also showed that the absolute currents were lower for Fe-45% Ni alloy. All results were in good agreement with others and confirmed clearly that the corrosion resistance in HCl solutions for Fe-45% Ni alloy was higher than that obtained for Fe-45% Ni alloy.

Highlights

Iron-nickel alloys have been widely used in the industry because of its many good characteristics [1,2,3,4]
The values of cathodic Tafel slope, corrosion potential (ECorr), anodic Tafel slope, corrosion current density, polarization resistance (Rp), and corrosion rate (RCorr) that were obtained from the cyclic potentiodynamic polarization (CPP) curves are depicted in Table 1, where the values of jCorr and ECorr were obtained from the extrapolation of anodic and cathodic Tafel lines located next to the linearized current regions [24,25,26,27,28]
The corrosion resistance of Fe-36% Ni alloy and Fe-45% Ni alloy in 1 M HCl solutions was investigated using different electrochemical and spectroscopic techniques

Summary

Introduction

Iron-nickel alloys have been widely used in the industry because of its many good characteristics [1,2,3,4] These alloys have unique magnetic properties, good mechanical properties, and low thermal expansion coefficient at lower temperatures. Due to their high corrosion and heat resistances. Jinlong et al [10] have reported the corrosion resistance of coarse grained and nanocrystalline Ni-Fe alloys in NaCl solutions and proton exchange membrane fuel cell environment.

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