Temperature Dependence Of Corrosion Research Articles

Investigation of Vitamin B12 as a corrosion inhibitor for mild steel in HCl solution through gravimetric and electrochemical studies

Now a days green corrosion inhibitors are highly in demand to mitigate corrosion of metal and alloys due to their non-toxicity as well as the absence of heavy metal and toxic compounds in comparison to the organic corrosion inhibitors. Since in the past research conducted on vitamin B12 as a corrosion inhibitor, the study of thermodynamic and kinetic parameters was lacking, the present work is focussed on the temperature dependence of corrosion on Vit B12(Vitamin B12) for the mild steel surface which is an influencing parameter in the present day to day industrial problems. There is a desirable need for efficient inhibitors which work well in high temperatures too. So the present study consciously restricts itself to Vit B12, a naturally occurring corrosion inhibitor. VitB12 is a water-soluble vitamin and also called cobalamin. It is an ecofriendly organometallic compound, has many adsorption sites, and is thus a promising candidate for corrosion retardation. The Potentio-dynamic Polarisation and Electrochemical Impedance Spectroscopy (EIS) are the two techniques that have been used in the analysis of the corrosion inhibition efficiency of Vit B12. It has been observed that the addition of inhibitor Vit B12, shows an enhancement in the Rct (charge transfer resistance) and a decrease in the capacitance layer Cdl value, which indicates the formation of a protective layer over the mild steel surface. The study of thermodynamic and kinetic parameters of the inhibitor adsorption over the mild steel was performed through temperature study. The surface morphology in the absence and presence of Vit B12 on the mild steel was analyzed by FE-SEM where the smooth surface is visible in the presence of inhibitor which shows the protective behavior of Vit B12.

New insights into the corrosion of magnesium alloys — The role of aluminum

The atmospheric corrosion of several Mg–Al alloys was investigated at −4, 4 and 22°C. The rate of corrosion increased with increasing temperature and decreasing Al content. Also, the effect of temperature became stronger with increasing Al content. The cast microstructure was found to influence both the average corrosion rate and the temperature dependence of corrosion. The influence of Al on corrosion and on the temperature dependence of corrosion is discussed in terms of the Al enriched layer in the bottom of the surface film and the breakdown of the same layer by chloride ions.

Temperature dependence of corrosion of refractories in barium borosilicate glass melts

The effect of glass composition on the corrosion rate of refractories in barium borosilicate glasses was investigated earlier [I]. In this work we studied the temperature dependence of corrosion of melted-cast and sintered aluminosilicate refractories in melts of K8, BK8, and TKI4 barium borosilicate glasses. The melted-cast materials were represented by baddeleyite-corundum (BKCh-33) and corundum (K~L-95) refractories. The composition and properties of the sintered refractories* are shown in Table i.

On the influence of the water content on corrosion of metals in mono-carboxylic acids

Corrosion rates of Fe, Zn, Al and stainless steel AISI 304 in oxygen-free formic, acetic, propionic, and butyric acids with water contents between 0.06M and 4.0M have been obtained by polarisation resistance and mass loss measurements. In addition, the influence of temperature and chloride content on the corrosion of stainless steel has been investigated. The less water-like the organic solvent, the more significant is the influence of water in the sense of stimulating the corrosion reaction. The temperature dependence of corrosion is analogous to that in aqueous solutions.

The Corrosion of Zirconium and Zircaloy‐2 at Low Temperatures

The aqueous corrosion of zirconium and Zircaloy‐2 has been studied as a function of electrode potential, solution pH, and temperature below 100°C. The influence of these variables and of alloying is considered in terms of their effect on the rate and the temperature dependence of corrosion. The relation between the corrosion process and the electronic conduction in the oxide is discussed.