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SM ISO690:2012 DIKUSAR, Aleksandr , IVANENKOV, I., SAUSHKIN, Boris, SILKIN, Serghei, YUSHCHENKO, Serghei. High-Speed Anode Dissolution of Heat-Resistant Chrome–Nickel Alloys Containing Tungsten and Rhenium: I. Chloride Solutions
. In: Surface Engineering and Applied Electrochemistry, 2007, nr. 1(43), pp. 1-10. ISSN 1068-3755. |
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Surface Engineering and Applied Electrochemistry | |||||
Numărul 1(43) / 2007 / ISSN 1068-3755 /ISSNe 1934-8002 | |||||
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Pag. 1-10 | |||||
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The results of a study on the anode dissolution of two heat-resistant chrome–nickel alloys containing tungsten (12 wt %) as well as tungsten and rhenium (8 wt % of W and 6 wt % of Re) are described. The experiments took place in 2 M NaCl at a current density of up to 40 μ/cm2 using a rotating disk electrode. It is shown that the alloy with the greater tungsten content dissolves at a lower rate (due to the formation and accumulation of insoluble oxides layers on the surface) and at a current density lower than the maximum anode current density for the basic component (nickel, and, probably, cobalt) of the anodic dissolution. Transpassive dissolution takes place under conditions of thermokinetic instability of the electrode process. In this case, a decreasing dependence of the current efficiency on the current density is observed, and the dissolution rate is
independent of the tungsten concentration in the alloy. In the region of the maximum anode currents and the transition from one area of dissolution to another, abnormal anode dissolution takes place due to chemical oxidation of intermediate products by oxidizers—anode-dissolution products or solution components. The results of varying the chemical composition on surfaces depending on the treatment mode are presented.
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