Zinc In Hydrochloric Acid Corrosion Inhibitor For

The corrosion velocity and corrosion inhibition efficiency of many kinds of compound for zinc in 0. 8M HCl was studied using the weight-loss method,then some kinds of compounds with certain corrosion inhibition effect have been got in 0. 8M HCl solution.In these compounds isoquinoline, propiolic alcohol, benzalkonium bormide and cetyl pyridiniumwere selected as research object. Their corrosion inhibition action for zinc was studied with different temperatures in 0. 8M HCl by adsorption theory and electrochemical polarization-curve method, the mechanism of corrosion inhibition action was analyzed. The results indicated that the single molecule layer of these compounds adsorbed on the surface of zinc and almost followed Langmiur isothermal equation. The adsorption procedure of isoquinoline, propiolic alcohol and benzalkonium bormide was exothermic reaction, the adsorption ability and corrosion inhibition efficiency decreased with increasing in temperature. But the adsorption procedure of the cetyl pyridinium bormide was a heat-absorbing reaction. the adsorption ability and corrosion inhibition efficiency increased when temperature increased. They are all cathodic type inhibitor. The corrosion current was decreased by them in different degree.A composite and excellent corrosion inhibitor was composed by orthogonal method. The corrosion inhibition action of this composite corrosion inhibitor has been evaluated by using weight-loss method, electrochemical polarization-curve method and scanning electron microscopy techniques. The corrosion rate of zinc in HCl acid has been determined with different concentration of HCl acid, different temperature and different time. The SEM photos indicated that no signal of was found under different corrosion condition. It shows that the composite corrosion inhibitor is an excellent corrosion inhibitor for zinc in HCl solution.