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priprema materijala za kromiranje

 
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issigonis
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Joined: 20 Feb 2010
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PostPosted: Sat Jan 05, 2013 1:39 pm    Post subject: priprema materijala za kromiranje Reply with quote

Ako netko planira proći jeftinije ili želi sam isprobati kak se to dela i samostalno pripremiti pa onda odnijeti djelove na kromiranje
evo u grubo postupak:

Galvanostegija je kak veli internet Smile tehnologija elektrokemijskog nanošenja metalnih
prevlaka na površini različitih materijala u cilju njihove zaštite ili
poboljšanja estetskih osobina. Još se koristi naziv
elektroplatiranje (engl. electroplating).

cijeli postupak prpreme nije ni malo lagan jer nas večina doma ima "hobi alate",ak ima i takve.

ak se planira ponovo kromirati dio koji je več prije bil kromiran skidanje starog sloja kroma bolje je prepustiti osobi/firmi koja se bavi kromiranjem jer je kvalitetnije i sigurno ga je bolje kemijski odstranjivati nego mehaničkim putem.

inače se krom skida 40-80% industrijskom solnom kiselinom,dok je ova za "kučnu" uporabu preslaba ( 14-15%.).krom se može skinuti i elektrolizom ali je to izuzetno spori proces skidanja.

moguće je kromirati i aluminij koji treba proči ultrazvučno odmašćivanje pa tek zatim na finu obradu,poliranje i na kraju kromiranje.

priprema dijelova za kromiranje na žalost nikad nemože biti kvalitetna jer se materijal ne pobakri. bakar je nešto poput špric kita kod farbanja auta. inače je mekan i lako se skida,ali kad se na njega stavi nikal koji ima izuzetnu tvrdoču pa zatim odradi kromiranje dobije se proizvod kakav se danas teško može kupiti,a nekad se viđao na starim autima. zato loše pripremljeni današnji kromirani proizvodi imaju vijek trajanja od dve godine.

stari krom vrlo je teško za odstraniti pa priprema dijelova za kromiranje koji inače nisu bili niti kromirani niti galvanizirani poprilično olakšava postupak osim ak se radi o djelovima koji su zbog svog oblika ili veličine teže dostupni za obradu.

takav dio najjednostavnije je odfurat stručnjaku da ga obradi kemijskim putem

niklani i pobakreni djelovi se lakše bruse.

Prvi korak je odstranjivanje masnoče ili prljavštine. pranje djelova u Ivasolu nitro razrjeđivačima ili nafti (nakon koje je opet potrebno isprati ivasolom) te zatim ispiranje jačim pritiskom i velikim količinama vode (ak nemate drugu mogučnost ja koristim samouslužne autopraone).dobrodošla je i nekakva četka,skalper i šarafciger da se sve fino počisti .

nakon kaj se dio očisti slijedi drugi korak.otklanjanje stare farbe ako je dio koji pripremamo polakiran. danas postoji veliki izbor gelova i tekučina koji nam mogu olakšati postupak,ali najrašireniji i cijenom najprihvatljiviji je večini dobro poznati Desol. Može se poslužiti i brušenjem ili eventualno pjeskarenjem (koje ipak treba plačati a često se zbog neadekvatnog pijeska ili lošeg kuta pjeskarenja uništi ili ošteti materijal koji se obrađuje). Za neke dijelove potrebna je i kombinacija tih postupaka.najbitnije je da se boja odstrani u cjelini.

površina koju smo dobili sad bi trebala biti sasvim očiščena i spremna za sljedeči korak.šmirgl papirom (najbolje je početi sa stotkom).večina čeličnih djelova nakon prethodne obrade imat če po sebi veče ili manje rupice nastale hrđanjem. najbitnije je te točkice odstraniti da se dobije sasvim ravna čista podloga.može se koristiti i nekakav biaks,bušilica itd,ali ipak je najkvalitetnije raditi fino polako na ruku.
problem je ak je hrđa ušla preduboko ili je dio koji se obrađuje jako tanki. onda je potrebno taj komad zapuniti mesingom a to je opet posel za stručnjaka. lakše je nači takav dio i zamjeniti ga manje uništenim jer se u uništeni dio galvanizacijom neče "zaljepiti" dovoljna količina nikla niti kroma pa postoji velika šansa da ti djelovi ubrzo počnu ponovo hrđati. a nači nekog ko bi htel to popuniti mesingom u Zagrebu je nemoguča misija.
Zatim sljedi brušenje sa papirima 200,300,400,500,600,800,1000,1200,pa 1500 i 2000 (tzv vodobrusni) a nije dobro preskakati granulacije jer ostaju risevi koji kasnije kod kromiranja unište sav trud.

Sad je materijal obrađen i spreman za poliranje. Bušilica,nastavak za poliranje(filc) i purol pasta čine čuda. ak se polira dio koji se neče nositi na kromiranje sasvim je dovoljna ta procedura (npr klipnjače). za dio koji ide na daljnju obradu-kromiranje recimo potrebni je nakon purola obraditi na isti način,ali sa drugim nastavkom sa nekom finijom polir pastom.

danas se za kromiranja koristi se dva sloja nikla i zatim kromiranje.ako se želi dobiti kvalitetniji rezultat površina se prvo mora pobakriti a zatim niklati i kromirati.
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