I-Chromate yokwambathisa kumphezulu we-aluminiyam

I-aluminiyam kunye ne-aluminium alloys ziphathwa nge-corrosion resistant conversion coating ebizwa ngokuthi "i-chromate coating" okanye "i-chromating". General indlela kukucoca umphezulu we-aluminiyam uze usebenzise ukwakheka kwechromium eneasidi kuloo ndawo icocekileyo. Iingubo zoguqulo zeChromium zixhathisa kakhulu kumhlwa kwaye zibonelela ngogcino olugqwesileyo lweeyaleko ezilandelayo. Uhlobo olwahlukileyo lweengubo ezilandelayo zingasetyenziswa kwi-chromate yokuguqula i-coating ukuvelisa umgangatho owamkelekileyo.

Into esiyibiza ngokuba yi-phosphating kwintsimbi yentsimbi ibizwa ngokuba yi-chromating yomphezulu we-aluminiyam. Kwakhona yaziwa njengokwaleka kwe-alodine. Kukho iintlobo ezityheli, eziluhlaza kunye ne-transparent chromating. Iidyasi zekhromati ezityheli Cr+6, iidyasi zekhromati eziluhlaza Cr+3. Ubunzima bokwambathisa bunokwahluka ngokwexesha lesicelo kunye nohlobo lokwaleka. Ubushushu bokomisa akufunekanga budlule ngaphezu kwe-65 º C kwikhromati etyheli kunye ne-85 º C kwiityabu eziluhlaza kunye ne-transparent chromate.

Kungeniswa ngaphandle ukubonelela ngomphezulu ococekileyo, ongenagrisi phambi kokusetyenziswa kwechromate. Ukuba ibhafu yokucoca eshushu ilungisiwe, ibhafu ye-caustic kunye nebhafu elandelayo ye-nitric acid ingasetyenziselwa ukuchola. Kwelinye icala, iibhafu zokwehlisa iasidi zinamandla okuchola ngokwawo. I-Chromating kunye ne-adhesion yepeyinti iya kuba ngcono kakhulu kwindawo ekhethiweyo kunye ne-degreased ye-aluminium.

Kanye kunye nokubonelela ukuxhathisa okuphezulu kwe-corrosion kunye neempawu zokunamathela kwipeyinti kumphezulu we-aluminium, kwaziwa kakuhle ukuba umnqweno obonakalayo unokuphuculwa ngokwenza i-chromate yokugqoka ngokuqhagamshelana nomphezulu kunye nesisombululo sokugubungela ukuguqulwa kwamanzi okuqulethe i-ion chromium kunye nezinye izongezo.