The effect of benzotriazole (BTA), tolytriazole (TTA), benzo (c) cinnoline (E1), benzo (c) cinnoline 5-oxy (E2), 2,2-dinitro benzidyn (E4) and 2-Aminobenzo (c) cinnoline (E5), were investigated on the corrosion of pure zinc metal in four different aqueous solutions. The corrosion rates of the species were determined by electrochemical current density-potential curves. Primary studies have shown that BTA and TTA have inhibitory effect on copper, and compounds containing nitrogen and sulphur reduce the corrosion rate of zinc. The inhibition efficiencies were studied at different pH values in order to clarify the effect of organic compounds. The results revealed that BTA and TTA act as effective inhibitors on zinc in HCl, NaOH and NaCl solutions. Cinnolines were only effective in NaOH solution.
The surface of magnesium electrode was coated by immersing in phosphate, tungstate, molibdate and cerium solutions, after polishing with sand paper and abrading in 0.15 M HCl solution for 20 seconds. The corrosion of modificated magnesium with different compounds was investigated by electrochemical methods in 1 M NaCl solution. The results show that phosphate, tungstate, molibdate and cerium cations provide the corrosion protection for magnesium forming insoluble compounds on magnesium surface. The inhibition effect of protective layers prepared on magnesium surface were investigated by using potential time, current potential curves and Electrochemical Impedance Spectroscopy (EIS) spectra. The inhibition effect was calculated from corrosion rates and polarization resistance.
ÜN ETKİSİ ÖZions was investigeted with pre-treatment phosphate (disodyum phosphate, SP)and silicate (disodyum silikat, SS) ions on zinc. On the zinc sufrace pretreatment with phosphate and silicate ions interacted with Ce 3+ and after optained cyclic voltametry in ox+aniline solution was researched zinc electrode corrosion by potential changes with time (OCP), ACimpedance (EIS) and current-potentail curves in sodium cloride solution. It was shown that coated with higher concentration of Ce 3+ on silicate exhibited lower corrosion rate and provided better corrosion protection (99%) on zinc.
Corrosion inhibitors are widely used in aerated neutral sodium cloride solution. In this study, the effect of metal cations (Co +2 , Ni +2 , La +3 and Ce +3 ) on the corrosion of aluminium and its alloys in an aerated 1 M NaCl solution were investigated by polarisation measurements. The inhibition efficiencies of metal cations were investigated by obtaining current-potential curves in 1M NaCl solution and by calculating corrosion characteristics from current-potential curves. Electrochemical studies showed these cations to axhibit inhibitive effect on the corrosion of aluminium alloys in the studied solution.
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