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BRUNIRANJE

Prvo ćemo da raščistimo sa izrazom. Često se od naših lovaca i strijelaca čuju izrazi, bromiranje, brumiranje i broniranje koji paraju uši. Evo sad smo se dogovorili da se kaže bruniranje i tako ćemo od sada govoriti. Oksidni crni sloj koji nastaje djelovanjem kaustične sode uz dodatak natrijum nitrata i natrijum nitrita pri povišenim temperaturama na čelik, ima određena antikorozivna i dekorativna svojstva tako da je bruniranje pored svih nedostataka ostalo i danas u najširoj upotrebi u oružarstvu. Autor: Mladen Puzigaća

Ime bruna se veže za italijanski jezik, bruno - crni, ali i za francuski jezik, brun - što nemam pojma šta znači.

Bruniranje je evoluiralo od Rimskog carstva kada su iskovane mačeve potapali u kotlove sa ključalim kokošijim đubrom (primitivno fosfatiranje) i samo njima poznatim bućkurišima do današnjih dana. Možda su današnje metode malo suptilnije ali je ipak kontrolisano nastali oksidni sloj i onda i sada nastao kao antikorozivna zaštita čelika.

Bruniranje može da bude, bazično, kiselo i elektrolitičko. Po postupku može da bude toplo i hladno. Kvalitet brune isključivo zavisi od kvaliteta pripreme elektrolita i ispoliranosti metala. Plavičasto crna bruna govori da je hemija pogođena a brunirani predmet savršeno pripremljen i ispoliran.

Bruna se može poboljšati caponiranjem, sapunskim pasiviziranjem, potapanjem u hromnu kiselinu, uljenjem i namašćivanjem. Svi ovi postupci poboljšavaju kvalitet antikorozivnog sloja ali je pravilo da se bruna mora čuvati od kiselina koje je detaljno uništavaju. Poseban dušman za brunu je hlorovodonična kiselina koja je pušljiva, odnosno isparava i nepogrešivo jede onu finu crnu boju sa naše ljubimice.

 

Manja oštećenja na bruni se mogu popraviti korektivnom, hladnom brunom, ali je to sve ispod kvaliteta koji se dobije pravim bruniranjem.

Autor: Mladen Puzigaća

www.zrno.ba

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