PL93006B2 - - Google Patents

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Publication number
PL93006B2
PL93006B2 PL171351A PL17135174A PL93006B2 PL 93006 B2 PL93006 B2 PL 93006B2 PL 171351 A PL171351 A PL 171351A PL 17135174 A PL17135174 A PL 17135174A PL 93006 B2 PL93006 B2 PL 93006B2
Authority
PL
Poland
Prior art keywords
solution
weight
brightening
brass
acid
Prior art date
Application number
PL171351A
Other languages
Polish (pl)
Other versions
PL93006B1 (en
Inventor
Zembura Zdzislaw
Kolny Henryk
Hubicka Barbara
Ziolkowska Wieslawa
Woroniecki Tadeusz
Original Assignee
Akademia Górniczo Hutniczaim Stanislawa Staszica
Akademia Górniczohutniczaim Stanislawa Staszica
Filing date
Publication date
Application filed by Akademia Górniczo Hutniczaim Stanislawa Staszica, Akademia Górniczohutniczaim Stanislawa Staszica filed Critical Akademia Górniczo Hutniczaim Stanislawa Staszica
Priority to PL171351A priority Critical patent/PL93006B2/pl
Publication of PL93006B1 publication Critical patent/PL93006B1/xx
Publication of PL93006B2 publication Critical patent/PL93006B2/pl

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Description

Przedmiotem wynalazku jest srodek do chemicznego wyblyszczania, zwlaszcza tasm mosieznych o zawartosci miedzi 63 i 68% wagowych. Chemiczne wyblyszczanie znajduje zastosowanie tam, gdzie nie jest mozliwe elektropolerowanie, a wiec w przypadku wyrobów o duzej powierzchni, a takze w ciaglych procesach obróbki. « Znane roztwory chromianowe, albo roztwory z dodatkiem nadtlenku wodoru lub nadsiarczanu amonu, posiadaja ograniczone zastosowanie ze wzgledu na nietrwale i kosztowne substancje wprowadzane do roztworu. Inne znane srodki to roztwory zawierajace kwas azotowy, siarkowy i solny. Jednak, wydzielajace sie trujace tlenki azotu sa szkodliwe i w zwiazku z tym roztwory te sa rzadziej stosowane. Opisane w literaturze przez H. Silmana („Chemische und Galvanische Oberziige", r. 1952, str. 86) kapiel wodna do wyblyszczania, zawierajaca sole zelazowe, sklada sie z 9% wagowych siarczanu zelazowego, 0,1% wagowych soH Seignette'a, 3% wagowych kwasu octowego i 0,5% wagowych kwasu cytrynowego. Kapiel ta dziala w temperaturze 25°C. Kwas cytrynowy jest drogim skladnikiem tego roztworu a jego dodatek nie wplywa, w zakresie bledu pomiarowego, na polysk i zywotnosc roztworu. Istota wynalazku jest roztwór do chemicznego wyblyszczania, zwlaszcza tasm mosieznych, zawierajacy w jednym litrze wody 4,5^-9,5% wagowych bezwodnego siarczanu zelazowego, 3,0—6,0% wagowych lodowatego kwasu octowego i:.0,1—1,0% wagowych soli Seignette'a. Srodek wedlug wynalazku, jest trwalym i tanim srodkiem wyblyszczajacym, który jednoczesnie nie wytrawia powierzchni metalu. Roztwór ten podwyzsza poziom wyblyszczenia powierzchni o okolo 30%, w porównaniu z wartoscia poczatkowa, przy czym stopien odbicia swiatla jest nie mniejszy niz 70%. Przyklad. Do roztworu wodnego zawierajacego 3% wagowych lodowatego kwasu octowego, dodaje sie 4,5% wagowych bezwodnego siarczanu zelazowego oraz 0,1% wagowych soli Seignette'a. Nastepnie skladniki intensywnie miesza sie. Tasme mosiezna, po wstepnym usunieciu zgorzeliny w dwumolowym roztworze kwasu siarkowego, zanurza sie w roztworze wyblyszczajacym na okres 5 minut. Zywotnosc srodka wynosi: dla mosiadzu M63 okolo 0,6 m2 na litr roztworu, a dla M68 okolo 0,5 m2 na litr roztworu. »2 93 006 PLThe invention concerns a chemical brightening agent, particularly for brass strips with a copper content of 63 and 68% by weight. Chemical brightening is used where electropolishing is not possible, such as for large-surface products, as well as in continuous processing processes. Known chromate solutions, or solutions with added hydrogen peroxide or ammonium persulfate, have limited application due to the unstable and expensive substances introduced into the solution. Other known agents include solutions containing nitric acid, sulfuric acid, and hydrochloric acid. However, the toxic nitrogen oxides released are harmful, and therefore these solutions are less frequently used. The water bath for brightening containing iron salts described in the literature by H. Silmann ("Chemische und Galvanische Oberziige", 1952, p. 86) consists of 9% by weight of ferric sulfate, 0.1% by weight of Seignette's sulfate, 3% by weight of acetic acid and 0.5% by weight of citric acid. This bath operates at a temperature of 25°C. Citric acid is an expensive component of this solution and its addition does not affect, within the range of measurement error, the gloss and pot life of the solution. The invention is a chemical brightening solution, particularly for brass strips, containing 4.5-9.5% by weight of anhydrous ferric sulfate, 3.0-6.0% by weight of glacial acetic acid, and 0.1-1.0% by weight of Seignette's salt per liter of water. The solution according to the invention is a durable and inexpensive brightening agent that does not etch the metal surface. This solution increases the surface brightening level by approximately 30% compared to the initial value, while the degree of light reflectance is no less than 70%. Example: To an aqueous solution containing 3% by weight of glacial acetic acid, add 4.5% by weight of anhydrous ferric sulfate and 0.1% by weight of Seignette's salt. The ingredients are then mixed vigorously. After initial descaling in a two-molar sulfuric acid solution, the brass strip is immersed in the brightening solution for 5 minutes. The pot life of the brightening solution is approximately 0.6 m² per liter of solution for M63 brass, and approximately 0.5 m² per liter of solution for M68 brass. »2 93 006 PL

PL171351A 1974-05-22 PL93006B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL171351A PL93006B2 (en) 1974-05-22

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL171351A PL93006B2 (en) 1974-05-22

Publications (2)

Publication Number Publication Date
PL93006B1 PL93006B1 (en) 1977-05-30
PL93006B2 true PL93006B2 (en) 1977-05-31

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