Zinc plated
Nta: Zinc yog qhov ruaj khov hauv huab cua qhuav thiab tsis yooj yim hloov xim. Nyob rau hauv dej thiab av noo, nws cuam tshuam nrog oxygen los yog carbon dioxide los tsim oxides los yog alkaline zinc carbonate zaj duab xis, uas tuaj yeem tiv thaiv zinc los ntawm kev txuas ntxiv mus rau plating thiab oxidized thiab ua lub luag haujlwm tiv thaiv.
Zinc yog qhov yooj yim heev rau corrosion hauv acids, bases thiab sulfides. Cov txheej galvanized feem ntau yog passivated. Tom qab passivated nyob rau hauv chromic acid los yog chromate tov, cov tsim passivation zaj duab xis yog tsis yooj yim rau cuam tshuam nrog huab cua noo, thiab lub peev xwm los tiv thaiv corrosion yog heev txhim khu kev qha. Rau lub caij nplooj ntoos hlav qhov chaw, nyias-walled qhov chaw (phab ntsa thickness<>
Tus qauv peev xwm ntawm zinc galvanization yog tsawg, yooj yim rau kev ua haujlwm thiab siv tau zoo, yog li zinc txheej yog anode rau ntau cov hlau.
Daim ntawv thov: Universal siv galvanized nyob rau hauv atmospheric tej yam kev mob thiab lwm yam zoo ib puag ncig. Tab sis nws tsis haum rau txhuam qhov chaw.
Cadmium plating
Nta: Qhov chaw nyob rau hauv kev sib cuag nrog dej hiav txwv huab cua los yog dej hiav txwv thiab dej kub tshaj 70 degree, lub cadmium txheej yog ruaj khov, corrosion kuj, zoo lubrication, thiab dissolves maj mam nyob rau hauv dilute hydrochloric acid, tab sis nws yog heev yooj yim rau yaj nyob rau hauv nitric acid, insoluble nyob rau hauv alkali, thiab nws oxides yog insoluble nyob rau hauv dej. Cadmium txheej yog softer dua zinc txheej, hydrogen brittleness ntawm txheej yog me me, adhesion muaj zog, thiab nyob rau hauv tej yam kev mob ntawm electrolysis, cadmium txheej tau zoo nkauj dua li zinc txheej. Txawm li cas los xij, cov roj uas tsim los ntawm cadmium melting yog tshuaj lom, thiab cov kua ntsev cadmium soluble kuj yog tshuaj lom.
Nyob rau hauv tej yam kev mob, cadmium yog ib tug cathodic txheej ntawm hlau thiab ib tug anode txheej nyob rau hauv dej hiav txwv thiab high-temperature atmospheres.
Daim ntawv thov: Nws yog tsuas yog siv los tiv thaiv qhov chaw ntawm atmospheric corrosion ntawm seawater los yog zoo li ntsev tov thiab saturated seawater vapor. Ntau yam kev lag luam aviation, nautical thiab hluav taws xob muaj qhov chaw, qhov chaw thiab cov xov tooj yog cadmium plating. Nws tuaj yeem polished, phosphated thiab pleev xim rau hauv qab txheej, tab sis nws tsis tuaj yeem siv los ua khoom noj khoom haus.
