PL8074B3 - A method of electrolytic separation of metallic chromium. - Google Patents
A method of electrolytic separation of metallic chromium. Download PDFInfo
- Publication number
- PL8074B3 PL8074B3 PL8074A PL807426A PL8074B3 PL 8074 B3 PL8074 B3 PL 8074B3 PL 8074 A PL8074 A PL 8074A PL 807426 A PL807426 A PL 807426A PL 8074 B3 PL8074 B3 PL 8074B3
- Authority
- PL
- Poland
- Prior art keywords
- solution
- metallic chromium
- sulphate
- chromium
- electrolytic separation
- Prior art date
Links
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims description 7
- 229910052804 chromium Inorganic materials 0.000 title claims description 6
- 239000011651 chromium Substances 0.000 title claims description 6
- 238000000034 method Methods 0.000 title claims description 6
- 238000000926 separation method Methods 0.000 title 1
- 239000000243 solution Substances 0.000 claims description 11
- 239000003792 electrolyte Substances 0.000 claims description 9
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 claims description 5
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 claims description 5
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 4
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical class [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 claims description 3
- 150000007522 mineralic acids Chemical class 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 3
- 150000007524 organic acids Chemical class 0.000 claims description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 2
- 230000002378 acidificating effect Effects 0.000 claims description 2
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 2
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 2
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 claims description 2
- 229910052939 potassium sulfate Inorganic materials 0.000 claims description 2
- 235000011151 potassium sulphates Nutrition 0.000 claims description 2
- 238000001556 precipitation Methods 0.000 claims description 2
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 2
- 235000011152 sodium sulphate Nutrition 0.000 claims description 2
- 238000006677 Appel reaction Methods 0.000 claims 1
- 239000000654 additive Substances 0.000 claims 1
- 239000001120 potassium sulphate Substances 0.000 claims 1
- 239000000126 substance Substances 0.000 claims 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 claims 1
- 229910021653 sulphate ion Inorganic materials 0.000 claims 1
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- 229910000906 Bronze Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- BNOODXBBXFZASF-UHFFFAOYSA-N [Na].[S] Chemical compound [Na].[S] BNOODXBBXFZASF-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 150000001844 chromium Chemical class 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000012047 saturated solution Substances 0.000 description 1
Description
Najdluzszy czas trwania patentu do 24 lutego 1942 r.W patencie Nr 7018 opisany jest spo¬ sób elektrolitycznego wydzielania chromu, przyczem jako roztwór elektrolityczny sto¬ suje sie wodny roztwór kwasu chromowe¬ go, Wzglednie chromianów, z dodatkiem nie¬ wielkiej ilosci siairczaniu sodowego.Nowy wynalazek dotyczy dalszego roz¬ winiecia powyzszego sposobu, opracowane¬ go na podstawie wielu doswiadczen. Okaza¬ lo sie mianowicie, ze mozna równiez doda¬ wac i wieksize ilosci siarczanu sodowego, a taklze mozna go zastepowac innemi solami np. siarczanem potasu, kwasnym siarcza¬ nem, siarczanem magnezu jak równiez obo- jetnemi i kwasnemi fosforanami i podobne- mi elektrolitami; oprócz tego elektrolity mo¬ ga takze zawierac organiczne i nieorganicz¬ ne kwasy. Nalezy zaznaczyc, iz dodawanie elektrolitów do roztworów soli chromu dla otrzymania chromu metalicznego jest wo- góle znane, Jednakze przy sposobach zna¬ nych dodaje sie taka ilosc elektrolitu, ze powstaje rqztwór nasycony. Natomiast we¬ dlug niniejszego wynalazku, dodawania elektrolitu nie posuwa sie az do osiagniecia stanu nasycenia roztworu. Dobre wyniki p- trzymuje sie juz przy dodatku okolo 0,5 g elektrolitu, jak w patencie glównym, wzglednie 1 g na litr roztworu kwasu chro¬ mowego o ciezarze wlasciwym 1,05, Aby osiagnac rówlnomierne wywiazywa¬ nie sie wodoru równiez i tutaj nalezy sto¬ sowac bardzo zwarte elektrody, korzystnie z walcowanego olowiu. Przy uzyciu takiejkadzi elektrolitycznej oraz opasanych elek¬ trod, przy napieciu okolo 3—4 V i gestosci pradu okojlo 0,6.A osiaga sie na metalu 'przeznaczonym do powleczenia chromem metalicznym, nietylko trwaje przylegajacy osad chromu, lecz trwala nieporowata po^ wlóke, czego riie mozna bylo otrzymac spo^ sobami dotychczasowemi. Chrom osadza sie tak mocno, ze nawet przy kuciu nie od¬ pada, Sposób -wykonywa sie jak nastepuje: do roztworu kwasu chromowego o ciezarze wla¬ sciwym 1,05 lub do roztworu chromianów (z dodatkiem niewielkiej ilosci H2S04J do¬ daje sie na kazdy litr roztworu w kadzi elektrolitycznej 0,5 do 1 g elektrolitu, za¬ wierajacego isole obojetne lub kwasne albo organiczne lub nieorganicznie kwasy. Tem¬ perature roztworu (kadzi elektrolitycznej) utrzymuje sie okolo 35°—40°C, napiecie 3— 4 V, gestosc pradu 0,6 A. Jezeli jprzy pierw¬ szej próbie na katodzie wydzielaja sie bron- zowe koloidalne tlenki, to nalezy do roz¬ tworu dodac kilka kropel kwasu. Przed1 przygotowaniem kadzi elektrolitycznej na¬ lezy jednak wykonac próbe z niewielka ilo¬ scia cieczy, albo tez oznaczyc analitycznie ilosc wolnego H2S04 w roztworze kwasu chromowego. Osad mozna otrzymywac róz¬ nobarwny: czarny, matowo-sirebrny, bly¬ szczacy srebrny i lustrzano-srebrny, zalez¬ nie od temperatury elektrolitu. Dla osia¬ gniecia powloki lustrzano srebrnej, wystar¬ czy uprzednie wygladzenie przedmiotu przeznaczonego do zanurzania w kadzi, wszelkie zas scieranie jego powierzchni dla nadania mu polysku jest po elektrolizie zu¬ pelnie zbyteczne. PL PLThe longest term of the patent until February 24, 1942 Patent No. 7018 describes a method of electrolytic precipitation of chromium, where the electrolytic solution is an aqueous solution of chromic acid, or chromates, with the addition of a small amount of sodium sulfur. it concerns a further development of the above method, developed on the basis of many experiments. It turned out that large amounts of sodium sulfate can also be added, and that it can also be replaced with other salts, e.g. potassium sulfate, acid sulfate, magnesium sulfate, as well as neutral and acid phosphates and similar electrolytes. ; in addition, the electrolytes may also contain organic and inorganic acids. It should be noted that the addition of electrolytes to solutions of chromium salts to obtain chromium metal is generally known. However, in the known processes, an amount of electrolyte is added such that a saturated solution is formed. In contrast, according to the present invention, the addition of the electrolyte does not proceed until the solution is saturated. Good results are already obtained with the addition of about 0.5 g of electrolyte, as in the main patent, or 1 g per liter of chromic acid solution with a specific weight of 1.05. In order to obtain an even hydrogen evolution, it is also necessary here to very compact electrodes, preferably of rolled lead, are used. With the use of such an electrolytic tank and strapped electrodes, at a voltage of about 3-4 V and a current density of about 0.6. And on the metal to be coated with metallic chromium, not only adhering chromium deposits persist, but a non-porous sheath is obtained, which could not be obtained in the hitherto way. Chromium is so strongly deposited that it does not fall off even during forging. The method is carried out as follows: to a chromic acid solution with a specific weight of 1.05 or to a chromate solution (with the addition of a small amount of liter of solution in the electrolytic tank 0.5 to 1 g of electrolyte, containing neutral or acidic isols, or organic or inorganic acids. current density 0.6 A. If bronze colloidal oxides are released on the cathode during the first test, add a few drops of acid to the solution. Before preparing the electrolytic tank, however, make a test with a small amount of liquid or also analytically determine the amount of free H 2 SO 4 in the chromic acid solution. The precipitate can be colored in different colors: black, matt silver, sparkling silver and silver, depending on the temperature of the electrolyte. It is sufficient to polish the object to be immersed in the ladle beforehand, and any abrasion of its surface to give it a shine after electrolysis is completely unnecessary. PL PL
Claims (1)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| PL8074B3 true PL8074B3 (en) | 1927-12-31 |
Family
ID=
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE2457582C3 (en) | Aqueous, acidic, galvanic chromium bath based on Cr (IH) | |
| PL8074B3 (en) | A method of electrolytic separation of metallic chromium. | |
| US1838777A (en) | Chromium plating | |
| US1969553A (en) | Electrolyte for the deposition of | |
| US2714089A (en) | Electrodepositing iron | |
| US2469015A (en) | Method and compositions for producing surface conversion coatings on zinc | |
| Stout et al. | Electrodeposition of Iron, Copper and Nickel Alloys from Cyanide Solutions—Part I | |
| GB258219A (en) | Improvements in and relating to process of electro-plating with chromium | |
| US1619835A (en) | Plating metals | |
| DE323066C (en) | Process for cleaning the surface of objects made of iron or steel by electrolytic means | |
| DE2940462C2 (en) | Electrolyte for the cathodic deposition of alloys of nickel with molybdenum | |
| GB493518A (en) | Process for the production of metal coating of stainless steel | |
| SU10531A1 (en) | Electric way. chrome plating | |
| US2802779A (en) | Electrodeposition of nickel and nickel alloys | |
| DE2333096A1 (en) | ELECTROPLATING IN NICKEL AND IRON | |
| US1713514A (en) | Process of electrolytically separating metallic chromium for the production of chromium coatings on other metals | |
| PL17444B1 (en) | A method of coating metal objects with tungsten or molybdenum bronze. | |
| US1901531A (en) | Electrodeposition of platinum | |
| SU111103A1 (en) | Bath for electroplating copper coating on the steel base | |
| SU855084A1 (en) | Complexing additive to sulfuric acid electrolyte for metal precipitation | |
| DE688814C (en) | free nickel deposits | |
| AT260817B (en) | Process and device for the electrochemical reduction of waste water containing chromate and chromic acid | |
| Stout et al. | The Electrodeposition of Ternary Alloys of Cadmium, Zinc and Tin | |
| DE595159C (en) | Process for electrolytic chromium deposition from chromium salt solutions | |
| GB746772A (en) | Improvements in or relating to processes for the electrolytic polishing of metals |