Chromate coating yealuminium pamusoro

Aluminium uye aruminiyamu alloys anobatwa neiyo corrosion resistant conversion coating inonzi "chromate coating" kana "chromating". General nzira ndeyekuchenesa nzvimbo yealuminium uye wozoisa acidic chromium kuumbwa pane iyo yakachena nzvimbo. Chromium conversion coatings inoshingirira mukuora zvakanyanya uye inopa kuchengetedzwa kwakanaka kwemajasi anotevera. Rudzi rwakasiyana rwemachira anotevera anogona kuiswa kune chromate yekushandura coating kuti ibudise inogamuchirwa nzvimbo.

Chatinodaidza kuti phosphating kusimbi simbi inonzi chromating yealuminium nzvimbo. Uyewo inozivikanwa sealodine coating. Kune yero, yegirini uye yakajeka chromating marudzi. Yero chromate majasi Cr+6, egirinhi chromate majasi Cr+3. Coating uremu hunogona kusiyana zvichienderana nenguva yekushandisa uye rudzi rwekupfeka. Tembiricha yekuomesa haifanire kudarika 65 º C yeyero chromate uye 85 º C yegirinhi uye yakajeka chromate coatings.

Inopinza kupa yakachena, girizi yemahara nzvimbo pamberi pechromate application. Kana inopisa yekugezesa yekugezesa yakagadziriswa, caustic bath uye kutevera nitric acid yekugezera inogona kushandiswa kunhonga. Kune rimwe divi, acidic degreasing yekugezera ine pickling kugona pachayo. Chromating uye pendi adhesion ichave iri nani pane yakasanganiswa uye yakasvibiswa aluminium pamusoro.

Pamwe chete nekupa yakakwira corrosion kuramba uye pendi adhesion zvivakwa kune aruminiyamu pamusoro, zvinonyatsozivikanwa kuti chishuwo chekuona chinogona kuvandudzwa nekugadzira chromate coating nekubata pamusoro neaqueous conversion coating solution ine chromium ions nezvimwe zvinowedzera.