CS277469B6 - Electrolyte for decontamination of metallic materials in an "electrochemical" in situ solution - Google Patents
Electrolyte for decontamination of metallic materials in an "electrochemical" in situ solution Download PDFInfo
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- CS277469B6 CS277469B6 CS896475A CS647589A CS277469B6 CS 277469 B6 CS277469 B6 CS 277469B6 CS 896475 A CS896475 A CS 896475A CS 647589 A CS647589 A CS 647589A CS 277469 B6 CS277469 B6 CS 277469B6
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Abstract
Elektrolyt pře dekontamináciu kovových materiálov elektrochemickým spósobom "in šitu" v roztoku obsahuje 0,05 až 0,3 hmotnostných percent kyseliny anilín-2,5-disulfónovej, 0,1 až 0,4 hmotnostných percent dihydrátu kyseliny šťavelovej, zvyšok do 100 hmotnostných percent tvoří voda.The electrolyte for the decontamination of metal materials by the electrochemical method "in situ" in solution contains 0.05 to 0.3 weight percent of aniline-2,5-disulfonic acid, 0.1 to 0.4 weight percent of oxalic acid dihydrate, the remainder up to 100 weight percent is water.
Description
Vynález sa týká elektrolytu určeného pre dekontamináciu zariadení primárného okruhu jádrovéj elektrárně elektrochemickým spósobom in situ” v roztoku, pre potřeby znižovania radiačněj záťaže pracovného prostredia a sprístupneriia kovových povrchov defektoskopickým skúškam.The invention relates to an electrolyte intended for the decontamination of the primary circuit equipment of a nuclear power plant by an electrochemical method in situ in solution, for the purpose of reducing the radiation load of the working environment and making metal surfaces accessible to defectoscopic tests.
Potěrajší stav technikyMore agile state of the art
V prevádzkových aplikáciách uvedeného spósobu elektrochemickej dekontaminácie, t.j. ”in situ v roztoku, je v súčasnosti známe použitie elektrolytov na báze kyselin šťavelovej a citrónové j . Ich hlavnou nevýhodou je relativné vysoký obsah kyseliny šťaveiovej (1 až 3 hmotnostných percent), ktorá pri dlhodobom pósobem rozptylových prudovych hustot nižších ako 0,5 A.dm J vyvolává zvýšené špecifické korozně napadnutie dekontaminovaného kovového povrchu, napr. medzikryštalický atak. Opakované používanie elektrochemickej dekontaminácie za týchto podmienok má významný nepriaznivý vplyv na kvalitu opracovaného povrchu, na jeho odolnost voči dalšej koróžii a rekontaminácii a negativny dopad na jeho- opátovnú dekontaminovateinosť.In operational applications of said electrochemical decontamination process, i.e. in situ in solution, it is currently known to use electrolytes based on oxalic and citric acids. Their main disadvantage is the relatively high content of oxalic acid (1 to 3 weight percent), which at long-term dispersion current densities lower than 0.5 A.dm J causes increased specific corrosion attack of the decontaminated metal surface, e.g. intercrystalline attack. Repeated use of electrochemical decontamination under these conditions has a significant adverse effect on the quality of the treated surface, its resistance to further corrosion and recontamination, and a negative impact on its re-decontamination.
Ďalej je známe použitie elektrolytov obsahujúcich kyselinu sulfosalicylovú, ktoré do istej miery zmierňujú nedostatky vyššie uvedených elektrolytov. Jeho hlavnou nevýhodou je však nedostatok základnéj zložky — kyseliny sulfosalicylovej, čo jeho využitie v prevádzkovej praxi značné obmedzuje až vylučuje.Furthermore, the use of sulfosalicylic acid-containing electrolytes is known, which to some extent alleviate the deficiencies of the above-mentioned electrolytes. However, its main disadvantage is the lack of a basic component - sulfosalicylic acid, which considerably limits or even eliminates its use in operational practice.
Dalším znevýhodňujúcim kritériem všetkých uvedených elektrolytov je ich relativné vysoká koncentrácia 0,7 až 3 hmotnostných percent.Another disadvantageous criterion of all said electrolytes is their relatively high concentration of 0.7 to 3 weight percent.
• Vyššie uvedené nedostatky odstraňuje elektrolyt podlá vynálezu, ktorého podstata spočívá v tom, že obsahuje 0,05 až 0,3 hmotnostných percent kyseliny anilín-2,5-disulfónovej a 0,1 až 0,4 hmotnostných percent dihydrátu kyseliny šťaveiovej. Zvyšok do 100 hmotnostných percent tvoří voda.The above-mentioned drawbacks are eliminated by the electrolyte according to the invention, which consists in the fact that it contains 0.05 to 0.3% by weight of aniline-2,5-disulfonic acid and 0.1 to 0.4% by weight of oxalic acid dihydrate. The remainder up to 100 weight percent is water.
Výhodou elektrolytu podlá vynálezu je úplné odstránenie negativného pósobenia nízkých prúdových hustot na opracovávaný kovový povrch, dalej dosiahnutie vysokéj dekontaminačnej účinnosti pri podstatné zníženej koncentrácii zložiek - max. 0,45 hmotnostných percent.The advantage of the electrolyte according to the invention is the complete elimination of the negative effect of low current densities on the metal surface to be treated, further achieving a high decontamination efficiency at a substantially reduced concentration of components - max. 0.45 weight percent.
Příklad vyhotovenia vynálezuExample of an embodiment of the invention
Elektrolyt podia vynálezu bol použitý pri elektrochemickej dekontaminácii ulity hlavného cirkulačného čerpadla spósobom in situ v roztoku, ktorý obsahoval 0,1 hmotnostných percent kyseliny anilín-2,5-disulfónovej, 0,3 hmotnostných percent kyselinyThe electrolyte of the invention was used in the electrochemical decontamination of the main circulating pump shell in situ in a solution containing 0.1 weight percent aniline-2,5-disulfonic acid, 0.3 weight percent
CS 277469 B6 2 štavelovej-dihydrát, a bol doplněný do 100 hmotnostných percent z o vodou. Po naplněni ulity elektrolytem v mnozstve 1,3 m prebiehala dekontaminácia v trvaní 3,5 h pri prúdovej hustotě j=7 až 10 A.dm2. .CS 277469 B6 2 oxalic dihydrate, and was made up to 100 weight percent with water. After filling the shell with electrolyte in the amount of 1.3 m, decontamination took place for 3.5 h at a current density j = 7 to 10 A.dm 2 . .
Pri uvedenej aplikácii a zložení bol dosiahnutý priemerný dekontaminačný faktor DF=1800. Metalografickými skúškami sa nezistil žiadny nepřípustný korózny vplyv použitého spósobu dekontaminácie na opracovaný povrch ulity.With said application and composition, an average decontamination factor DF = 1800 was achieved. Metallographic tests did not reveal any unacceptable corrosive effect of the decontamination method used on the treated surface of the shell.
Priemyselná využitelnosť.Industrial applicability.
Elektrolyt v zložení podlá vynálezu je využitelný pri dekontaminácii jadrovo-energetických zariadení elektrochemickým spósobom in situ v roztoku s výhodou jeho využitia pri príprave kovových povrchov na defektoskopickú skúšku.The electrolyte in the composition according to the invention is useful in the decontamination of nuclear power plants by the electrochemical method in situ in solution, preferably its use in the preparation of metal surfaces for a defectoscopic test.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS896475A CS277469B6 (en) | 1989-11-16 | 1989-11-16 | Electrolyte for decontamination of metallic materials in an "electrochemical" in situ solution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS896475A CS277469B6 (en) | 1989-11-16 | 1989-11-16 | Electrolyte for decontamination of metallic materials in an "electrochemical" in situ solution |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CS647589A3 CS647589A3 (en) | 1992-08-12 |
| CS277469B6 true CS277469B6 (en) | 1993-03-17 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CS896475A CS277469B6 (en) | 1989-11-16 | 1989-11-16 | Electrolyte for decontamination of metallic materials in an "electrochemical" in situ solution |
Country Status (1)
| Country | Link |
|---|---|
| CS (1) | CS277469B6 (en) |
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1989
- 1989-11-16 CS CS896475A patent/CS277469B6/en unknown
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| Publication number | Publication date |
|---|---|
| CS647589A3 (en) | 1992-08-12 |
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