... and Na₂SO₄ electrolytes with different concentrations (0.5 M to 0.25 M) and various temperatures (30°C to 50°C). The electrochemical corrosion behavior was evaluated by the potentiodynamic polarization. The microstructural investigations revealed the formation of laves phases ((Mg, Al)2 Ca) in the AZ31-0.5Ca...

... in these intermetallic phases was established using SEM coupled with energy dispersive spectroscopy (EDS). Low corrosion rates were observed after exposure of the weld specimens in boiling 14.5 M and 4 M HNO₃ solutions. In addition, potentiodynamic polarization tests in 4 M HNO₃ solution have been...

... behavior was evaluated based on potentiodynamic polarization tests performed in conjunction with electrochemical impedance and x-ray photoelectron spectroscopies of passive films that formed on alloys during their exposure to the HCl solution. Results have shown that an increase in Mo alone...

... electron microscopy. The potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) were used for as-deposited coatings. Corroded surface morphology and EIS of the 15-day immersion coatings and substrate were examined to analyze the anticorrosion performance. EIS showed an increase...

...Jia-mei Wang; Hui Lu; Le-fu Zhang; Fan-jiang Meng; Xue-lian Xu The effects of dissolved gas and cold work on the electrochemical behaviors of Type 304 stainless steel were investigated in simulated pressurized water reactor primary water environment by potentiodynamic polarization...

... and an investigation of its corrosion performance at high-temperature water. ^{9 - 14} atomic force microscopy focused ion beam high-temperature corrosion potentiodynamic polarization transmission electron microscopy x-ray photoelectron spectroscopy Ni-based Alloy 690 (UNS N06690) ⁽¹...

... International 2014 aluminum impedance organic coatings pitting corrosion potentiodynamic polarization The hybrid sol-gel was synthesized by combining two sols under ultrasonication. Sol 1 was prepared by mixing tetra-n-propoxyzirconium (TPOZ) with ethyl-acetate and adding nitric acid...

... potentiodynamic polarization and EFM are in good agreement. ^* Electrochemistry Laboratory, National Research Centre, Dokki, Cairo 12622, Egypt. Present address: Energy Materials Laboratory (EML), Physics Department, School of Sciences and Engineering, The American University in Cairo, PO Box 74...

...Y. Han; D. Gallant; X.-G. Chen The corrosion behavior of Al-B₄C (aluminum-boron carbide) metal matrix composites in a 0.5 M potassium sulfate (K₂SO₄) solution was investigated using electrochemical impedance spectroscopy and potentiodynamic polarization methods...

... in solution-treated cupronickel alloys 90-10 (Cu-10wt%Ni), with aluminum and iron additions, in 0.01 M, 0.1 M, or 0.6 M sodium chloride (NaCl) aqueous solutions. Polished surfaces of the studied materials were submitted to potentiodynamic polarization, and after that, the polarized surfaces were studied using...

... over a period of 4 days. Between data collection the samples were allowed to rest at the OCP. Potentiodynamic polarization curves were conducted with samples prepared in a similar manner as those samples used for EN experiments. The scan rate was 0.05 mV/s. All curves were run from –100 mV to 1.2 V...

... pitting corrosion potentiodynamic polarization Aluminum matrix composites are used extensively in a great variety of engineering applications, including pistons, wheels, brake drums, connecting rods, cylinder heads, and driving shafts in the automotive industry. ¹ In recent years...

...R. Magnabosco; N. Alonso-Falleiros For a better understanding of the relationship between the microstructure of UNS S31803 duplex stainless steel (DSS) and the shape of the polarization curves, this study evaluated the influence of the microstructure on the potentiodynamic polarization of the 850°C...

... 67.8 794.26 31.27 1.306 15.30 0.602 45 118.2 1,384.55 54.51 2.686 31.46 1 .239 65 7.03 82.35 3.24 5.47 64.26 2.53 85 6.06 70.99 2.79 4.674 54.76 2.146 FIGURE 8 XPS spectrum of CS recorded after potentiodynamic polarization test in aerated 100X YM water at 45°C...

...R. Magnabosco; N. Alonso-Falleiros The relation between pit morphology and microstructure formed during 850°C isothermal aging of UNS S31803 duplex stainless steel (DSS) could be reached through the explanation of pit nucleation and growth during potentiodynamic polarization in 3.5 wt% sodium...

...E.A. Abd El Meguid; N.A. Mahmoud Pitting corrosion of Type 904L (UNS N08904) stainless steel was investigated using the potentiodynamic polarization technique in different bromide concentrations, as well as in 0.6 M sodium bromide (NaBr) in the presence of some inorganic compounds at elevated...

...# –839 –718 –749 –20.83 aluminum electrochemical noise immersion inhibitor localized corrosion pitting potentiodynamic polarization sodium chloride The 7000 series aluminum alloys are widely used structural materials in the aerospace industry because of their high strength...

... (C₈H₆O₄), maleic acid (C₄H₄O₄), and orthophosphoric acid (H₃O₄P), and their inhibiting action on corrosion of aluminum, zinc, and mild steel was evaluated by various standard methods. The electrochemical potentiodynamic polarization method was also...

... (HCl) by the weight loss method. DSA exhibited the best performance, giving an inhibition efficiency of 98.7%. Potentiodynamic polarization studies revealed that all three organic compounds were mixed-type inhibitors. The adsorption of all three compounds on N-80 alloy followed Temkin’s adsorption...

... and potentiodynamic polarization methods. The values of activation energy and free energy of adsorption of all the thiosemicarbazides were calculated to investigate the mechanism of corrosion inhibition. The potentiodynamic polarization studies, carried out at room temperature, revealed that all the compounds blocked...