Chophimba cha chromate cha aluminiyamu pamwamba

Aluminiyamu ndi ma aluminiyamu aloyi amathandizidwa ndi zokutira zosagwirizana ndi dzimbiri zomwe zimatchedwa "chromate coating" kapena "chromating". General Njira ndikuyeretsa pamwamba pa aluminiyumu kenako ndikuyika chromium ya acidic pamalo oyerawo. Zovala zosinthika za chromium zimalimbana ndi dzimbiri ndipo zimasunga bwino zokutira zotsatira. Mitundu yosiyanasiyana ya zokutira zotsatizana zitha kugwiritsidwa ntchito pa zokutira zosinthika za chromate kuti zipange malo ovomerezeka.

Chimene timachitcha kuti phosphating kupita kuchitsulo chitsulo chimatchedwa chromating for aluminium surfaces. Komanso amadziwika ngati zokutira alodine. Pali mitundu yachikasu, yobiriwira komanso yowonekera. Zovala zachikaso za chromate Cr+6, malaya obiriwira a chromate Cr+3. Kulemera kwa zokutira kumatha kusiyanasiyana malinga ndi nthawi yogwiritsira ntchito komanso mtundu wa zokutira. Kutentha kowumitsa sikuyenera kupitirira 65 º C pa yellow chromate ndi 85 º C pa zokutira zobiriwira ndi zowoneka bwino za chromate.

Ndikofunikira kupereka malo oyera, opanda mafuta musanagwiritse ntchito chromate. Ngati bafa yotentha yotenthetsera yakonzedwa, kusamba kwa caustic ndi kutsata nitric acid kutha kugwiritsidwa ntchito ngati pickling. Kumbali inayi, malo osambira a acidic degreasing ali ndi kuthekera kodzitola okha. Kuyika kwa chromating ndi utoto kudzakhala bwino kwambiri pamtunda wothira mafuta ndi aluminiyamu.

Pamodzi ndi kupereka kukana kwa dzimbiri komanso kumatira kwa utoto pamwamba pa aluminiyamu, zimadziwika bwino kuti kufunikira kowoneka bwino kumatha kuwongolera popanga zokutira za chromate polumikizana ndi pamwamba ndi njira yosinthira yamadzi yosinthira yokhala ndi ayoni a chromium ndi zowonjezera zina.