Galvanized plating
Zinc yog qhov ruaj khov hauv huab cua qhuav thiab tsis yooj yim hloov xim.Nyob rau hauv dej thiab av noo, nws reacts nrog oxygen los yog carbon dioxide los tsim oxide los yog alkaline zinc carbonate zaj duab xis, uas tuaj yeem tiv thaiv zinc los ntawm kev txuas ntxiv mus rau oxidized thiab ua lub luag haujlwm tiv thaiv.
Zinc yog heev raug rau corrosion nyob rau hauv acids, alkalis thiab sulfides.Cov txheej galvanized feem ntau yog passivated.Tom qab passivation 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, nyias-walled qhov chaw (phab ntsa thickness <0.5m) thiab steel qhov chaw uas yuav tsum tau muaj zog mechanical zog, hydrogen tshem tawm yuav tsum tau nqa tawm, thiab tooj liab thiab tooj liab alloy qhov chaw yuav tsis tau hydrogen tshem tawm.
Tus qauv peev xwm ntawm zinc yog qhov tsis zoo, yog li zinc txheej yog txheej anodic rau ntau cov hlau.
Daim ntawv thov: Ua galvanizing feem ntau siv nyob rau hauv atmospheric tej yam kev mob thiab lwm yam dej siab ib puag ncig.Tab sis tsis yog rau qhov sib txhuam.
Cadmium plating
Qhov chaw nyob rau hauv kev sib cuag nrog marine huab cua los yog dej hiav txwv dej thiab nyob rau hauv cov dej kub tshaj 70 ℃, lub cadmium txheej yog ruaj khov, muaj zog corrosion kuj, zoo lubrication, dissolves qeeb heev nyob rau hauv dilute hydrochloric acid, tab sis yog heev yooj yim rau yaj nyob rau hauv nitric acid., insoluble hauv alkali, thiab nws cov oxides tsis soluble hauv dej.
Cov txheej txheej cadmium yog softer dua li zinc txheej, hydrogen embrittlement ntawm txheej yog me me, thiab adhesion yog muaj zog, thiab nyob rau hauv tej yam kev mob electrolytic, lub tau txais cadmium txheej yog zoo nkauj dua li zinc txheej.Tab sis cov roj uas tsim thaum cadmium melts yog tshuaj lom, thiab cov kua ntsev cadmium soluble kuj yog tshuaj lom.Raws li ib txwm muaj, cadmium yog txheej txheej cathodic ntawm cov hlau thiab cov txheej txheem anodic nyob rau hauv marine thiab kub cua.
Daim ntawv thov: Nws yog tsuas yog siv los tiv thaiv qhov chaw los ntawm atmospheric corrosion ntawm seawater los yog zoo li ntsev tov thiab saturated seawater vapor.Ntau yam kev lag luam hauv kev lag luam, marine thiab hluav taws xob, cov khoom siv hluav taws xob, thiab cov xov tooj yog plated nrog cadmium.Nws tuaj yeem polished, phosphatized thiab siv los ua xim primer, tab sis tsis tuaj yeem siv los ua tableware.
Chrome Plating
Chromium yog ruaj khov heev nyob rau hauv huab cua, alkali, nitric acid, sulfide, carbonate daws thiab organic acids, thiab yog yooj yim soluble nyob rau hauv hydrochloric acid thiab kub concentrated sulfuric acid.
Nyob rau hauv qhov kev txiav txim ntawm ncaj qha tam sim no, yog tias cov chromium txheej siv los ua cov anode, nws yooj yim soluble hauv caustic soda tov.
Cov txheej chromium muaj zog adhesion, siab hardness, 800 ~ 1000V, zoo hnav tsis kam, muaj zog lub teeb pom kev zoo, thiab kub kub kuj.Txo qis heev.Qhov tsis zoo ntawm chromium yog tias nws yog ib qho nyuaj, nkig thiab yooj yim kom poob tawm, uas yog pom tseeb dua thaum nws raug hloov pauv kev poob siab.
Nyob rau tib lub sijhawm, chrome yog ntxeem tau.Hlau chromium yog yooj yim passivated nyob rau hauv cov huab cua los ua ib tug passivation zaj duab xis, yog li hloov lub peev xwm ntawm chromium.Chromium ntawm hlau yog li dhau los ua cathodic txheej.
Daim ntawv thov: Nws tsis yog qhov zoo tagnrho rau ncaj qha phaj chrome rau ntawm qhov chaw ntawm cov hlau ua cov txheej txheem tiv thaiv corrosion.Feem ntau, ntau txheej electroplating (xws li tooj liab plating → nickel → chromium) tuaj yeem ua tiav lub hom phiaj ntawm kev tiv thaiv xeb thiab kho kom zoo nkauj.Tam sim no, nws tau siv dav hauv kev txhim kho qhov hnav tsis kam ntawm qhov chaw, kho qhov ntev, lub teeb pom kev zoo thiab cov teeb pom kev zoo.
Nickel plating
Nickel muaj cov tshuaj lom neeg ruaj khov zoo hauv huab cua thiab lye, tsis yooj yim los hloov xim, thiab tsuas yog oxidized thaum kub siab tshaj 600 ° C.Nws dissolves maj mam hauv sulfuric acid thiab hydrochloric acid, tab sis yooj yim soluble hauv dilute nitric acid.Nws yog ib qho yooj yim rau passivate nyob rau hauv concentrated nitric acid thiab yog li muaj zoo corrosion kuj.
Nickel plating yog ib qho nyuaj, yooj yim rau polish, muaj lub teeb pom kev zoo thiab ntxiv kev zoo nkauj.Nws qhov tsis zoo yog nws qhov porosity, txhawm rau txhawm rau kov yeej qhov tsis zoo no, ntau txheej hlau plating tuaj yeem siv tau, thiab npib tsib xee yog txheej nruab nrab.Nickel yog txheej txheej cathodic rau hlau thiab anodic txheej rau tooj liab.
Daim ntawv thov: Feem ntau yog siv los tiv thaiv corrosion thiab ua kom zoo nkauj, yog li nws feem ntau yog siv los tiv thaiv cov hniav txheej.Nickel plating ntawm cov khoom siv tooj liab yog qhov zoo tshaj plaws rau kev tiv thaiv corrosion, tab sis vim yog npib tsib xee kim dua, tooj liab-tin alloys feem ntau siv los ntawm nickel-plating.
Post lub sij hawm: Oct-11-2022