Kuyika galvanized
Zinc imakhala yokhazikika mumpweya wouma ndipo sikophweka kusintha mtundu.M'mlengalenga wamadzi ndi chinyezi, umakhudzidwa ndi mpweya kapena carbon dioxide kupanga oxide kapena alkaline zinc carbonate film, yomwe ingalepheretse zinc kuti isapitirire kukhala oxidized ndikugwira ntchito yoteteza.
Zinc imakhudzidwa kwambiri ndi dzimbiri mu acids, alkalis ndi sulfide.The kanasonkhezereka wosanjikiza zambiri passivated.Pambuyo podutsa mu chromic acid kapena yankho la chromate, filimu yopangidwa ndi passivation sivuta kuyanjana ndi mpweya wonyowa, ndipo mphamvu yotsutsa-kudzimbiri imakulitsidwa kwambiri.Pazigawo za masika, mbali zoonda-mipanda (khoma makulidwe <0.5m) ndi zida zachitsulo zomwe zimafuna mphamvu zamakina, kuchotsedwa kwa haidrojeni kuyenera kuchitika, ndipo mbali zamkuwa ndi zamkuwa sizingachotsedwe.
Kuthekera koyenera kwa zinki kumakhala koyipa, kotero kuti zokutira za zinki ndizopaka zitsulo zambiri.
Kugwiritsa ntchito: Kumapangitsa kuti malata agwiritsidwe ntchito kwambiri mumlengalenga komanso malo ena abwino.Koma osati pazigawo zokangana.
Cadmium plating
Magawo okhudzana ndi mlengalenga kapena m'madzi am'nyanja komanso m'madzi otentha opitilira 70 ℃, zokutira za cadmium ndizokhazikika, zimakhala ndi kukana kwamphamvu kwa dzimbiri, zokometsera zabwino, zimasungunuka pang'onopang'ono mu dilute hydrochloric acid, koma ndizosavuta kusungunuka mu nitric acid., wosasungunuka mu alkali, ndipo ma oxide ake sasungunuka m'madzi.
Kupaka kwa cadmium kumakhala kofewa kuposa zokutira zinki, kutsekemera kwa haidrojeni kwa zokutira kumakhala kochepa, ndipo kumamatira kumakhala kolimba, ndipo pansi pazifukwa zina za electrolytic, zokutira za cadmium zomwe zapezedwa zimakhala zokongola kwambiri kuposa zokutira zinki.Koma mpweya wotuluka mu cadmium ukasungunuka ndi wapoizoni, ndipo mchere wosungunuka wa cadmium umakhalanso wapoizoni.M'mikhalidwe yabwinobwino, cadmium ndi zokutira za cathodic pazitsulo ndi zokutira za anodic mumlengalenga wam'madzi komanso kutentha kwambiri.
Kugwiritsa ntchito: Amagwiritsidwa ntchito kwambiri kuteteza mbali zina kuti madzi a m'nyanja awonongeke ndi mphepo yamkuntho kapena mchere wofanana ndi womwewo ndi nthunzi wamadzi a m'nyanja.Zida zambiri zamagalimoto, zam'madzi ndi zamagetsi zamagetsi, akasupe, ndi zida za ulusi zimakutidwa ndi cadmium.Itha kupukutidwa, kupangidwa ndi phosphatized ndikugwiritsidwa ntchito ngati choyambira cha utoto, koma sichingagwiritsidwe ntchito ngati zida zapa tebulo.
Chrome Plating
Chromium imakhala yokhazikika mumlengalenga, alkali, nitric acid, sulfide, carbonate solutions ndi organic acids, ndipo imasungunuka mosavuta mu hydrochloric acid ndi sulfuric acid yotentha kwambiri.
Pansi pa mphamvu yachindunji, ngati chromium wosanjikiza imagwiritsidwa ntchito ngati anode, imasungunuka mosavuta mu caustic soda solution.
Chosanjikiza cha chromium chimakhala ndi zomatira zolimba, kuuma kwakukulu, 800 ~ 1000V, kukana kuvala bwino, kuwunikira kwamphamvu, komanso kukana kutentha kwakukulu.Zachepa kwambiri.Kuipa kwa chromium ndikuti ndizovuta, zofewa komanso zosavuta kugwa, zomwe zimakhala zoonekeratu pamene zimagwidwa ndi katundu wodabwitsa.
Pa nthawi yomweyo, chrome ndi porous.Chromium yachitsulo imadutsa mosavuta mumlengalenga kuti ipange filimu ya passivation, motero kusintha kuthekera kwa chromium.Chromium pa chitsulo motero amakhala zokutira cathodic.
Kugwiritsa ntchito: Sikwabwino kuyika chrome pamwamba pazigawo zachitsulo ngati anti-corrosion layer.Nthawi zambiri, ma electroplating amitundu yambiri (ie copper plating → nickel → chromium) amatha kukwaniritsa cholinga chopewera dzimbiri ndi kukongoletsa.Pakalipano, amagwiritsidwa ntchito kwambiri popititsa patsogolo kukana kwa magawo, kukonza miyeso, kuwala kowala ndi magetsi okongoletsera.
Nickel plating
Nickel ili ndi kukhazikika kwa mankhwala mumlengalenga ndi lye, sikophweka kusintha mtundu, ndipo imakhala ndi okosijeni kokha pamene kutentha kuli pamwamba pa 600 ° C.Amasungunuka pang'onopang'ono mu sulfuric acid ndi hydrochloric acid, koma amasungunuka mosavuta mu nitric acid.Ndiosavuta kuphatikizira mu nitric acid wokhazikika ndipo motero imakhala ndi kukana kwa dzimbiri.
Nickel plating ndizovuta, zosavuta kupukuta, zimakhala ndi kuwala kwakukulu komanso zimawonjezera kukongola.Kuipa kwake ndi porosity yake, kuti athetse vutoli, zitsulo zosanjikiza zambiri zingagwiritsidwe ntchito, ndipo nickel ndiye wosanjikiza wapakati.Nickel ndi zokutira cathodic chitsulo ndi anodic zokutira mkuwa.
Ntchito: Nthawi zambiri amagwiritsidwa ntchito poletsa dzimbiri ndikuwonjezera kukongola, motero amagwiritsidwa ntchito kuteteza zokutira zokongoletsa.Nickel plating pa zinthu zamkuwa ndi zabwino kwambiri poletsa dzimbiri, koma chifukwa faifi ndi okwera mtengo, kaŵirikaŵiri ma aloyi amkuwa amagwiritsiridwa ntchito m’malo mwa nickel-plating.
Nthawi yotumiza: Oct-11-2022