Influence of the Structure of Carbon Steels on the Corrosion,Hydrogenation, and Corrosion Cracking in Hydrogen-Sulfide Media

Materials Science - We study the influence of the structure of carbon steels on corrosion, hydrogenation, and corrosion cracking in NACE solution. The corrosion and hydrogenation rates of U8 steel...     

Corrosion Properties of Oxide Ceramic Coatings Based on Alloys of the Al–Cu–Mg and Al–Mg Systems

Materials Science - By the methods of electrochemical impedance spectroscopy and potentiodynamic methods, we estimate the corrosion resistance of oxide ceramic coatings obtained on...     

Influence of Temperature and Carbon-Dioxide Pressure on the Corrosion and Stress-Corrosion Fracture of Pipe Steels in Model Stratal Water

Materials Science - We study the influence of temperature (20–120°C) on the corrosion and stress-corrosion fracture of JFE-13CR-80 (I), JFE-13CR-95 (II), JFE-HP1-13CR-110 (III), and...     

FOUR-FACTOR OPTIMIZATION FOR ELECTROCHEMICAL CONVERSION OF WC-NI PSEUDO ALLOY IN SULFURIC ACID SOLUTIONS

Anodic dissolution of WC-Ni pseudo alloy in (0.5–5) M H₂SO₄ + (0–1.5) M NiSO₄ solutions with anode potentials of 1.2–2.5 V and at temperatures of 293–353 K was studied. The effect of electrolyte component concentration and the indicated parameters of electrolysis on the rate of WC anodic conversion into WO₃ as well as on the current efficiency is discussed. The optimum range of electrolysis parameters at which high current density and current efficiency are ensured was selected. The mathematical models of four factors’ (sulfuric acid and nickel sulfate concentrations, anode potential, and temperature) effect on electrochemical conversion were elaborated using the Brandon algorithm (BA), the group method of data handling (GMDH), and the least-squares method (LSM). It was shown that the multiplicative model developed by the Brandon algorithm represents the electrochemical conversion most adequately.