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Abstract  

A multi-functional separation process is proposed as one of the technologies for implementing the Adv.-ORIENT (Advanced Optimization by Recycling Instructive ElemeNTs) Cycle concept [<cite>1</cite>]. The tertiary pyridine-type anion exchange resin (TPR) embedded in silica beads (silica-supported TPR) was demonstrated suitable for the separation process of actinides from spent fuel. In this process, hydrochloric acid (HCl) and a mixture of nitric acid (HNO3) and methanol (MeOH) are used as eluents. In order to apply this process to an engineering plant scale, two important issues must be evaluated to prove the system suitability. One is an environmental aspect represented by the use of HCl solution which is corrosive to many materials. The other is clarification of the reactive safety of silica-supported TPR and the HNO3–MeOH solvent mixture. Four types of metals, Ta, Zr, Nb, and Hastelloy-B (28%Mo–Ni) were selected as candidate materials which are anti-corrosive toward HCl. Corrosion experiments were conducted in HCl type simulated high level liquid waste (SHLLW) solution at room temperature for a maximum 720 h and at 90 °C for 336 h. Ta showed an all-round anti-corrosion property in HCl type SHLLW solution, and Hastelloy-B was only acceptable at room temperature. Thermal analysis by differential scanning calorimetry was done to investigate the thermal stability of silica-supported TPR-NO3/MeOH/HNO3 mixtures. Heating experiment results on a gram scale were also obtained and evaluated to determine the conditions necessary to avoid runaway reactions. As a result, it was confirmed that a vigorous exothermic reaction can be avoided by controlled decrease of temperature.

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I. , Bilčík J. Modeling of reinforcement corrosion in concrete , Proceedings of 22nd International Conference on Engineering Mechanics , Svratka, Czech Republic, 9-12 May 2016, pp. 206 – 209 . [7

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Badawy, W. A., Al-Kharafi, F. M. & El-Azab, A. S. (1999): Electrochemical behaviour and corrosion inhibition of Al, A1-6061 and Al-Cu in neutral aqueous solutions. Corr. Sci. , 41 , 709

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ensure the environmental regulations. The inhibitor must be environmentally friendly to replace the older, which is more toxic and harmful to the environment. When applying the ideas of green chemistry to the area of corrosion inhibitors, the major

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environmental pollutants, relative humidity and the extreme variability of materials housed in collections. Corrosion develops under thin layers of adsorbed oxygen and water and only a few adsorbed molecular layers of moisture are required for corrosion to

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[1] Musić S. , Ristić M. , Gotić M. , Forić J. Corrosion of simulated nuclear waste glass , Journal of Radioanalytical and

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corrosion resistance. Numerous methods are available for the development of suitable implant materials. Each has known advantages and disadvantages. One solution can be producing more biocompatible – Al- and V-free – β-type Ti alloys containing non

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1 Introduction The study on aluminium and its alloy in line with its corrosion behaviour in various hostile environments have continuously generated extensive concern due to the innumerable utilisation of the alloy [ 1–4 ]. For aluminium to resist

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Abstract  

Corrosion products of mild steel exposed to four different cultures of sulfur reducing bacteria (SRB) grown in a synthetic medium have been studied by transmission Mössbauer spectroscopy (TMS). Cultures of SRB studied are two hydrogenase positive strains,Desulfovibrio desulfuricans (DD) andDesulfovibrio vulgaris (DV) and two hydrogenase negative strainsDesulfotomaculum orientis orientis (DO) andDesulfotomaculum nigrificans (DN). The corrosion products generated on the coupons as well as in the broth were studied. In all the cases, the corrosion products removed from coupons showed the presence of green rust 2 (GR2), ferrous sulfides, γ-FeOOH and superparamagnetic (SPM) α-FeOOH in different proportions. The corrosion products from the broth showed a symmetrical central doublet, which indicates the presence of γ-FeOOH and SPM α-FeOOH along with ferrous sulfides. The corrosion products from coupons suspended in sewage water also showed the presence of GR 2 and ferrous sulfides together with oxyhydroxides. FTIR spectrum supports the presence of these phases in corrosion products. The formation of GR 2 on coupons seems to be the first step for the SRB induced corrosion. The corrosion rate has been found in the order of DO>DN>DV>DD.

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Abstract  

The inhibiting action of film-forming Dodigen 481 and A-5 inhibitors in petrol-water media was studied by means of Mössbauer spectroscopy and gravimetric method. The inhibiting effect is about 90%. The mechanism of corrosion process changes in the presence of an inhibitor.

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