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There is a high demand for high performance, effective and eco-friendly corrosion inhibitors for industrial applications. Therefore, novel benign high performance corrosion inhibitors based on biopolymer were synthesized in-situ using different cellulosic materials and niacin. Characterization of the cellulose nano-composite was carried out by Fourier transform infrared (FTIR), thermal gravimetric analysis (TGA), dynamic light scattering (DLS), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX). The anticorrosive performance of cellulose composites for copper in 3.5% NaCl solutions were evaluated using polarization and electrochemical impedance spectroscopy (EIS) techniques. Surface morphology of uninhibited and inhibited composites was studied using SEM and EDX. Potentiodynamic polarization measurements confirmed that cellulose based inhibitors act as a mixed type inhibitor. The inhibition efficiency of ethyl cellulose-niacin composite (NEC) was 94.7% outperforms those of microcrystalline cellulose-niacin composite (NMCC) and carboxymethyl cellulose-niacin composite (NCMC) which were 33.2 and 83.4%, respectively, as green corrosion inhibitors for Copper in 3.5% NaCl solutions. The data extracted from EIS were fitted through an equivalent circuit to model the corrosion inhibition., (Copyright © 2020 Elsevier B.V. All rights reserved.)

This paper reports a corrosion problem in the headspace sampling needle when using a phase reaction conversion headspace gas chromatographic method in Agilent headspace auto-sampler. The examination by microscopy shows that corrosion mainly takes place on the surface of the outer wall of the needle that is exposed to the air during each headspace sampling. Since it was proven that the helium flushing is effective in minimizing the pit type of corrosion on the stainless needle material, a custom-made surface flushing device was proposed for corrosion inhibition.