Chromate shafi don aluminum surface

Aluminum da aluminum gami ana bi da su ta hanyar jujjuyawar jujjuyawar abin da ake kira "rufin chromate" ko "chromating". General hanyar ita ce tsaftace saman aluminum sannan a yi amfani da abun da ke tattare da sinadarin chromium na acidic akan wannan tsaftataccen saman. Rubutun jujjuyawar Chromium suna da matukar juriya da lalata kuma suna ba da kyakkyawan riko na suturar da ke gaba. Za'a iya amfani da nau'in nau'i daban-daban na baya-bayan da aka yi amfani da su a kan gyaran gyare-gyare na chromate don samar da farfajiya mai karɓa.

Abin da muke kira kamar phosphating zuwa karfe ƙarfe ana kiransa chromating don saman aluminum. Hakanan an san shi azaman alodine shafi. Akwai rawaya, kore da m iri chromating. Rigar rawaya chromate Cr+6, koren chromate riguna Cr+3. Nauyin sutura na iya bambanta bisa ga lokacin aikace-aikacen da nau'in sutura. Zafin bushewa dole ne ya wuce 65º C don chromate rawaya da 85 º C don kore da madaidaicin suturar chromate.

Yana da mahimmanci don samar da tsaftataccen wuri, mai kyauta kafin aikace-aikacen chromate. Idan an shirya wanka mai zafi mai zafi, ana iya amfani da wankan caustic da bin wanka na nitric acid don tsinke. A daya hannun, acidic degreasing wanka suna da pickling da kansu. Chromate da fenti adhesion zai fi kyau a kan pickled da kuma lalatar da aluminum saman.

Tare da samar da high lalata juriya da fenti manne Properties zuwa aluminum surface, shi ne da aka sani cewa gani kyawawa za a iya inganta ta hanyar kafa wani chromate shafi ta tuntubar da surface tare da wani ruwa mai ruwa hira shafi bayani dauke da chromium ions da sauran Additives.