I-Chromate coating yendawo ye-aluminium

I-Aluminiyamu ne-aluminium alloys iphathwa ngokuguqula ukumelana nokugqwala okubizwa ngokuthi "i-chromate coating" noma "chromating". General Indlela yokuhlanza ingaphezulu le-aluminium bese usebenzisa ukwakheka kwe-chromium ene-asidi kuleyo ndawo ehlanzekile. Izingubo zokuguqulwa kwe-Chromium zimelana kakhulu nokugqwala futhi zinikeza ukugcinwa okuhle kakhulu kwama-coatings alandelayo. Uhlobo oluhlukile lwezingubo ezilandelayo lungasetshenziswa ekuguquleni i-chromate ukuze kukhiqizwe indawo eyamukelekayo.

Esikubiza ngokuthi i-phosphating to iron an iron kubizwa ngokuthi i-chromating yezindawo ze-aluminium. Futhi yaziwa nangokuthi i-alodine coating. Kunezinhlobo ze-chromating eziphuzi, eziluhlaza okotshani kanye ne-transparent. Amajazi echromate aphuzi u-Cr+6, amajazi e-chromate aluhlaza u-Cr+3. Isisindo sokugqoka singahluka ngokuya kwesikhathi sokufaka isicelo kanye nohlobo lokugqoka. Izinga lokushisa lokumisa akumele lidlule ngaphezu kuka-65 º C ku-chromate ephuzi kanye no-85 º C kuma-coatings aluhlaza kanye ne-transparent chromate.

Kuyangeniswa ukuhlinzeka indawo ehlanzekile, engenawo amafutha ngaphambi kokufakwa kwechromate. Uma ukugeza okushisa okushisayo kulungisiwe, ukugeza kwe-caustic kanye nokugeza okulandela i-nitric acid kungasetshenziselwa ukuqoqa. Ngakolunye uhlangothi, okugeza okune-acidic degreasing banekhono lokukhetha ngokwalo. I-Chromating nokunamathisela ngopende kuzoba ngcono kakhulu endaweni efakwe emanzini anosawoti kanye ne-degreased.

Ngokuhambisana nokuhlinzeka ukumelana nokugqwala okuphezulu kanye nezakhiwo zokunamathisela ngopende endaweni ye-aluminium, kwaziwa kahle ukuthi ukufiseleka okubukwayo kungase kuthuthukiswe ngokwakha uqweqwe lwe-chromate ngokuthinta indawo engaphezulu ngesisombululo se-aqueous conversion coating esiqukethe ama-ion e-chromium nezinye izithasiselo.