Dahaarka Beddelka Birta Galvanized
Fosfooraska birta ama alaabta jaakadaha nadiifka ah waxay soo saaraan dahaar beddelaad yar ama aan la ogaan karin oogada zinc. Qaar badan oo ka mid ah khadadka dhamaystirka biraha badan ayaa isticmaala fosfatooyin bir ah oo wax laga beddelay kuwaas oo bixiya nadiifin, oo ka taga etch-kiimikada yaryar ee zinc substrates si ay u bixiyaan sifooyinka adhesion.
Degmooyin iyo gobolo badan ayaa hadda xaddid ku leh Zinc PPM-yada, taas oo ku qasbeysa dhammeeyayaasha birta inay bixiyaan daawaynta xal kasta oo lagu farsameeyo substrate-ka zinc.
Dahaarka beddelka fosfooraska zinc waa, laga yaabaa, dahaarka tayada ugu sarreeya ee laga soo saari karo dusha galvanized. Si loo soo saaro daahan zinc phosphate on galvanized, wakiilada dardargelinta gaarka ah ayaa loo baahan yahay si ay u dhaqaajiyaan dusha si ku filan si ay u helaan daahan zinc fosfooraska. Xirmooyinkaas waxaa lagu abuuray ficilka kiimikada qubeyska ee alaabta dusha sare. Fosfooraska zinc crystalline ayaa dhab ahaantii "ku koray" dusha sare ee nadiifka ah. Qaybta caadiga ah ee todobada marxaladood ee zinc phosphating, marxaladaha kala duwan waa:
- Nadiifiyaha alkaline.
- Nadiifiyaha alkaline.
- Biyo kulul raaci.
- Zinc fosfooraska xalinta.
- Biyo qabow raaci.
- Daawaynta ka dib (midkood chromium ama nooca nonchromium).
- Biyo maydhid la'aan.
Unug lix-marxalad ah ayaa baabi'in doona marxaladda 1, cutubka shanta ah wuxuu baabi'in doonaa marxaladaha 1 iyo 7. Habka buufinta awoodda ee codsiga, qaybaha lagu daboolayo waxay ku xiran yihiin tunnel halka xalka laga soo saaro haanta haynta. oo lagu buufiyo cadaadis saaran qaybaha. Xalka dahaarka ayaa si joogto ah dib loogu soo celiyaa habka is-dhexgalka ee codsiga, qaybaha lagu daboolayo ka dib marka la nadiifiyo ayaa si fudud loogu dhex milmay xalka fosfatinta ee ku jira haanta birta ah ee aan nadiifka ahayn. Dahaarka fosfatka waxaa badanaa lagu dabaqaa iyadoo la isticmaalayo shan, lix, ama todoba marxaladood. Xalka fosfatetada waxa lagu hayaa heerkul u dhexeeya 100 ilaa 160°F (38 ilaa 71°C) si loogu buufiyo; 120 ilaa 200F (49 ilaa 93°C) ee hadhuudhka; ama heerkulka qolka ee gacmaha lagu masaxo. Miisaanka dahaarka zinc phosphate ee la dabaqay waa inuu ahaadaa 150 ilaa 300 mg./sq. ft.A waqti processing ee 30 si ay u 60 ilbiriqsi by buufin iyo 1 ilaa 5 daqiiqo by immersion waa caadi. dahaarka ayaa laga yaabaa inuu yahay mid ka mid ah dahaarka saldhigga ugu fiican ee birta galvanized. Xalka ka-hortagga fosfaatka chromium ma soo saaro daahan ku habboon rinjiga saldhigga birta galvanized.