Studies On The Inhibitor Of Zinc In Hydrofluoric Acid Solution

Zinc is widely used as protective equipment, steel and other coated materials. However, the deposition of impurities in the working medium, to protect equipment from corrosion, while the surface is often covered by fouling, the fouling of the equipment must be cleaned timely. Galvanized equipment in the current chemical cleaning, the hydrofluoric acid is applied over a wide range of cleaning agent. However, in the hydrofluoric acid cleaning process of zinc galvanizing equipment will be subject to severe corrosion, rational use and add a metal corrosion inhibitor is an effective way to prevent one, as applied to hydrofluoric acid cleaning of the zinc corrosion inhibitor has yet to see reports of hydrofluoric acid solution, therefore the corrosion of zinc has great practical value.The corrosion velocity and corrosion inhibition efficiency of many kinds of compound for zinc in 3% hydrofluoric was studied using the weight-loss method,then some kinds of compounds with certain corrosion inhibition effect have been got in 3% hydrofluoric solution.Select one of the DL-α-phenyl ethylamine, benzalkonium bromide, Secretary Ban -20 and cyclohexanone as the object of study, under different temperatures were medium in 3% hydrofluoric acid on zinc corrosion inhibition. By electrochemical polarization curves and adsorption theory, calculated by adding corrosion inhibitors for zinc corrosion in hydrofluoric acid in the activation energy and adsorption heat, and then the mechanism of inhibition. Through experimental results we can draw the following conclusions: This study of several substances in the temperature within the range consistent with Langmuir adsorption law, mainly produced in the zinc surface monolayer adsorption, and adsorption was exothermic process, with the temperature The adsorption capacity decreased inhibition efficiency decreased at 30℃their inhibition rates were:99.02 %,98.69%,98.34%,96.43%Elevated temperature due to subsequent low rate of single-component corrosion inhibitor, can not meet the needs of the actual work, there are some limitations, therefore need to develop a working medium to resist temperature, impurities and other factors combined effects of corrosion inhibitor. In this paper, several substances of this compound, to acquire a better inhibition effect of corrosion inhibitor compound. Carried out using the following methods on the evaluation of corrosion performance: weight loss, electrochemical polarization curves and scanning electron microscopy. By measuring the results proved better than the single-component corrosion inhibitor. SEM images showed no intergranular corrosion, pitting and other non-uniform corrosion, corrosion rate is high. Shows that the inhibitor compound is hydrofluoric acid medium fine zinc corrosion inhibitor.