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.
Nanoparticle studies are groundbreaking today, largely due to unpredictable changes in particle size and surface properties. Therefore, nanoparticles are considered building blocks in optoelectronics, pharmaceuticals, nuclear energy, bioengineering, biomedicine, and industrial applications. Today, the importance of environmentally friendly methods is increasing. The use of the green synthesis method, which adopts an economic synthesis approach that will reduce resource and energy consumption and not harm the environment, is also encouraged in every field. In the study, ascorbic acid, which has biosafety properties, was used as an alternative reagent (agent) to the chemical reduction method. The method process performed with the reagent selected for nanoparticle synthesis has ensured that it is green synthesis, which is adopted as non-toxic and environmentally friendly. In this study, nanoparticles were synthesized by reducing the sulfate, nitrate, chloride, and acetate salts of Cu(II), Ni(II), Co(II), Zn(II), and Mn(II) transition metals with the reducing agent ascorbic acid compound. It is aimed to investigate the effects of the same metal cations and different anion salts on nanoparticle synthesis. Depending on the radius ratios and solubility values of metal cations and anions, the nanoparticle obtained from Ni(CH3COO)2 salt has the smallest radius. Nano metal particles with the largest radius were obtained as a result of reduction from Co(NO3)2 salt. The characterization of the synthesized nanoparticles was recorded by particle size analysis and scanning electron microscopy (SEM) images.
The inhibition effects of oxalate, tungstate, molybdate and phosphate on corrosion of 99.99 %, 99.999 % zinc and 99.95 % molybdenum metals were investigated in NaCl solutions by potential-time, ACimpedance spectra and current-potential curves. The corrosion rates of metals are highly dependent on the purity of its. The inhibition effect of these anions on 99.999 % purity zinc is less than the effect on 99.99 % purity zinc. This implies that alloying elements are effective on inhibiting efficiencies of these anions. Inhibition effect of these anions decreases also with increasing NaCl concentration. None of the studied anions behaved as inhibitors on 99.999 % purity zinc in 1 M NaCl solution. The corrosion mechanism on the zinc metals is charge-transfer, but reaction on the molybdenium is diffusion controlled in the studied solutions.
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