scholarly journals DISSOLUTION OF STAINLESS STEEL IN SODIUM CHLORIDE SOLUTION AT POLARIZATION BY NON-STATIONARY CURRENT

2021 ◽  
Vol 447 (3) ◽  
pp. 75-81
Author(s):  
R.N. Nurdillayeva ◽  
Zh.G. Sauirbay ◽  
A.B. Bayeshov
Keyword(s):  
Stainless Steel ◽  
Current Efficiency ◽  
Alternating Current ◽  
Dissolution Behavior ◽  
Stainless Steel Electrode ◽  
Half Cycle ◽  
Electrochemical Dissolution ◽  
Steel Electrode ◽  
Current Frequency ◽  
Steel Electrodes

Stainless steel is in great demand due to its mechanical strength, heat resistance, and resistance to corrosive environments. This article presents the result of a study of the electrochemical dissolution behavior of a stainless steel electrode (12X18H10T) at polarization by 50 Hz alternating current in a neutral medium (NaCl). Preliminary experiments have shown that the main processes do not take place when two stainless steel electrodes are polarized with an alternating current. It was observed that by the polarization of the “stainless steel – titanium” pair electrodes with alternating current, the alloy is intensively dissolved with the formation of iron (II) and chromium (III) ions. This is due to the "valve" properties of the oxide layer formed on the surface of the titanium electrode. A change in the value of the current density of the titanium and steel electrodes significantly affects the process of electrochemical dissolution of the alloy. At high current densities, the dissolution rate of the alloy decreases due to the deterioration of the current correcting properties of titanium. With an increase in the electrolyte concentration, the current efficiency is reduced as salt passivation occurs. A maximum value of the current efficiency of dissolution of stainless steel was observed at a current frequency of 50 Hz. High frequencies of the alternating current do not provide an adjustable duration of the anodic half-cycle for the oxidation reaction due to the frequent change of halfcycles of the alternating current. It was observed that increasing the temperature of the electrolyte reduces the current efficiency of the electrochemical dissolution of stainless steel electrodes. The effects of main electrochemical parameters on the electrolysis process have been investigated, and the optimal conditions of the alloy dissolution were established (іТі = 60 kA/m2 , іSS = 800 A/m2 , [NaCl] = 2.0 M, t = 30, ν = 50 Hz.).

scholarly journals Cr(VI) Ion Reduction Reaction on Nickel and Stainless Steel Electrodes in Acid Medium

2019 ◽  
Vol 70 (7) ◽  
pp. 2321-2324
Author(s):  
Ioana Maior ◽  
Gabriela Elena Badea ◽  
Anca Cojocaru ◽  
Anca Maria Cimbru ◽  
Simona Bungau ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Charge Transfer ◽  
Reaction Rates ◽  
Limiting Current ◽  
Potential Range ◽  
Stainless Steel Electrode ◽  
Steel Electrode ◽  
Tafel Slope ◽  
Tafel Slopes ◽  
Steel Electrodes

The reduction of Cr(VI) ion in 0.5 M H2SO4 deaerated solutions with different concentrations of K2CrO4 on nickel and 18Cr-10Ni stainless steel electrodes have been studied by potentiostatic polarisation technique depending on the chromate concentration in solution. The kinetic parameters -Tafel slope, charge transfer coefficient and limiting current density -were evaluated comparatively. For the solutions containing �5 mM K2CrO4 the Tafel slopes are higher on stainless steel than on nickel (around -135 mV�dec-1 for nickel and -165 mV�dec-1 for stainless steel). Moreover, by increasing the chromate concentration the Tafel slopes increase on nickel and decrease on stainless steel. The low Tafel slope values of -75 mV�dec-1 obtained on stainless steel electrode in the potential region -0.5� -0.75V vs. SCE could be due to a decrease of the charge transfer process rate because of the presence of a physical barrier. The values for the reaction rates are slightly higher for nickel than for stainless steel electrodes on all the studied potential range. The reaction product is soluble trivalent chromium, excepting the solution with 500 mM K2CrO4, when a Cr(OH)3 film may cover the electrode surface that determines the decrease of the reaction rate.

Determination of Concentrated Hydrogen Peroxide Free from Oxygen Interference at Stainless Steel Electrode

2018 ◽  
Vol 90 (14) ◽  
pp. 8680-8685 ◽  
Author(s):  
Shimeles Addisu Kitte ◽  
Muhammad Nadeem Zafar ◽  
Yuriy T. Zholudov ◽  
Xiangui Ma ◽  
Anaclet Nsabimana ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Stainless Steel ◽  
Stainless Steel Electrode ◽  
Steel Electrode

Influence of Electromagnetic Treatment on Corrosion Behavior of Carbon Steel and 316L Stainless Steel in Simulated Cooling Water

2011 ◽  
Vol 347-353 ◽  
pp. 3135-3138
Author(s):  
Hong Hua Ge ◽  
Jie Ting Tao ◽  
Xiao Ming Gong ◽  
Cheng Jun Wei ◽  
Xue Min Xu
Keyword(s):  
Stainless Steel ◽  
Carbon Steel ◽  
Corrosion Behavior ◽  
316L Stainless Steel ◽  
Cooling Water ◽  
Stainless Steel Electrode ◽  
Transfer Resistance ◽  
Steel Electrode ◽  
Pitting Potential ◽  
Electromagnetic Treatment

Abstract: The effect of electromagnetic treatment on corrosion behavior of carbon steel and stainless steel in simulated cooling water was investigated by electrochemical impedance spectroscopy, potentiodynamic polarization techniques and water analysis. It was found that the charge transfer resistance decreased and the corrosion current density increased after electromagnetic treatment for carbon steel electrode, which shows that such treatment promotes corrosion of carbon steel in simulated cooling water. In contrast, the pitting potential of 316L stainless steel electrode rose which revealed that electromagnetic treatment of the experimental water exhibited corrosion inhibition to 316L stainless steel. Reasons for different corrosion behavior of the two metals were discussed.

Fabrication of nano-needle arrays on diamond surface by reactive ion etching

2012 ◽  
Vol 1395 ◽  
Author(s):  
T. Misu ◽  
K. Koh ◽  
T. Arai
Keyword(s):  
Stainless Steel ◽  
Reactive Ion Etching ◽  
Polycrystalline Diamond ◽  
Diamond Surface ◽  
Stainless Steel Electrode ◽  
Sintered Ceramic ◽  
Ion Etching ◽  
Steel Electrode ◽  
Diamond Substrate ◽  
Substrate Surfaces

ABSTRACTCVD polycrystalline diamond surfaces were etched using reactive ion etching system with either a conventional stainless steel electrode or MgO sintered ceramic containing electrode. The micro-needle array of high aspect on diamond substrate surfaces obtained with MgO electrode was fabricated by using back-sputtering from MgO electrode. The RMS roughness of diamond substrate surfaces obtained with MgO electrode is higher than those obtained with stainless steel electrode.

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