In this work, Aluminum alloy 6061 (A6061) was modified by Anodizing and incorporating with ZnO and Fe3O4 nanoparticles to improve its corrosion-resistant. The titanium sheet was used as a counter electrode and the DC voltage reach 20 mV while the anodizing solution was 20% H2SO4 while the H2SO4 was mixed with the two Oxide nanoparticle to incorporate the AA6061 surface. Anodizing and incorporation with (ZnO and Fe3O4) NPS were confirmed by X-ray diffraction. The surface morphology of anodized and incorporated surface was examined through scanning electron microscopy (SEM). Modified A6061 by Anodizing and nanoparticle incorporation revealed a good corrosion protection efficiency even at temperatures ranging (298-328) K in a saline medium. Where the corrosion current density increase with the increase in temperature. Activation energy and pre-exponential factor (kinetic parameters) were calculated and discussed. Also, thermodynamic values ?G* and ?H* were calculated.
This study will be investigating acidic corrosion of AA7051 alloy at a different temperature, and introduces milk thistle aqueous extract as a new and widely available green corrosion inhibitor. The electrochemical methods were used to measure weight loss, penetration loss, corrosion inhibition efficiency and other parameters. The data substituted in Langmuir adsorption isotherm as well as in kinetic equations. The finding exhibit high corrosion inhibition efficiency at 0.5g/L of milk thistle extract and the efficiency rose from around 72% at 293K to just over 86% at 333K. Langmuir model linear regression coefficient ( =0.98) and the slight change in corrosion potential refer to mixed-type inhibitor attach to the surface by chemisorption. FTIR spectra for crude extract supported by literatures shows the molecular structure of the main component of milk thistle extract and exhibit the O-H group as a major group participate in adsorption.
The subject of this research involves studying adsorption to remove hexavalent chromium Cr(VI) from aqueous solutions.
Adsorption process on bentonite clay as adsorbent was used in the Cr(VI) concentration range (10-100) ppm at different temperatures (298, 303, 308 and 313)K, for different periods of time.
The adsorption isotherms were obtained by obeying Langmuir and Freundlich adsorption isotherm with R2 (0.9921-0.9060) and (0.994-0.9998), respectively.
The thermodynamic parameters were calculated by using the adsorption process at four different temperatures the values of ?H, ?G and ?S was [(+6.582 ? +6.547) kJ.mol-1, (-284.560 ? -343.070) kJ.mol-1 and (+0.977 ? +1.117) kJ.K-1.mol-1] respectively. This data indicates the spontaneous sorption process.
The kinetic study of adsorption process was studied depending on three kinetic equations:
1- Lagergren equation
2- Morris-Weber equation
3- Reichenberg equation
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