head_banner

Nkhani

ndondomeko
Zopangira → kuchotsera mafuta → kutsuka m'madzi → pickling → kuchapa → kusambitsa madzi → kumiza pothandizira kusungunula → kuyanika ndi kutentha koyambirira → kuthirira kotentha → kutsirizitsa → kuziziritsa → passivation → kutsuka → kuyanika → kuyang'ana
(1) Kuchepetsa mafuta
Chemical degreasing kapena madzi-based zitsulo degreasing kuyeretsa wothandizila angagwiritsidwe ntchito degreasing mpaka workpiece ndi kwathunthu kunyowetsedwa ndi madzi.
(2) Kukoleza
Atha kuzifutsa ndi H2SO4 15%, thiourea 0.1%, 40~60℃ kapena HCl 20%, hexamethylenetetramine 1~3g/L, 20~40℃. Kuonjezera kwa corrosion inhibitor kungalepheretse matrix kuti asawonongeke kwambiri komanso kuchepetsa kuyamwa kwa haidrojeni muzitsulo zachitsulo. Kuchotsa mafuta pang'ono ndi pickling kungayambitse kusamata bwino kwa zokutira, kusanjikiza kwa zinki kapena kusenda kwa zinki.
(3) Kumizidwa kusinthasintha
Imadziwikanso kuti bonding agent, imatha kupangitsa kuti ntchitoyo ikhale yogwira ntchito isanamiza kumizidwa kuti ipititse patsogolo kulumikizana pakati pa plating layer ndi gawo lapansi. NH4Cl 15%~25%, ZnCl2 2.5% ~3.5%, 55 ~ 65 ℃, 5 ~ 10min. Pofuna kuchepetsa kugwedezeka kwa NH4Cl, glycerin ikhoza kuwonjezeredwa moyenera.
(4) Kuyanika ndi kutentha kale
Pofuna kupewa chogwirira ntchito kuti chisapunduke chifukwa cha kukwera kwakukulu kwa kutentha panthawi yomiza, ndikuchotsa chinyezi chotsalira, kuteteza kuphulika kwa zinki, zomwe zimabweretsa kuphulika kwa madzi a zinki, kutentha kwa preheating nthawi zambiri kumakhala 120-180 ° C.
(5) Kuthira malata otentha
Ndikofunikira kuwongolera kutentha kwa yankho la zinc, nthawi yodumphira ndi liwiro lomwe chogwiriracho chimachotsedwa muzitsulo za zinc. Kutentha kumakhala kochepa kwambiri, madzi amadzimadzi a zinki ndi osauka, zokutira zimakhala zokhuthala komanso zosagwirizana, zimakhala zosavuta kutulutsa, ndipo maonekedwe ake ndi osauka; kutentha ndi kwakukulu, madzi amadzimadzi a zinki ndi abwino, madzi a zinki ndi osavuta kupatukana ndi chogwirira ntchito, ndipo chodabwitsa cha sagging ndi makwinya chimachepa. Kupaka kwamphamvu, kopyapyala, mawonekedwe abwino, kuchita bwino kwambiri; Komabe, ngati kutentha kuli kwakukulu, chogwirira ntchito ndi mphika wa zinki zidzawonongeka kwambiri, ndipo zinki zambiri zidzapangidwa, zomwe zidzakhudza khalidwe la nthaka yovimbidwa ndi kuwononga nthaka yambiri. Pa kutentha komweko, nthawi yomiza yomizidwa ndi yayitali ndipo plating wosanjikiza ndi wandiweyani. Pamene makulidwe omwewo amafunikira pa kutentha kosiyana, zimatenga nthawi yaitali kuti plating yomiza kwambiri ikhale yotentha. Pofuna kupewa kutentha kwakukulu kwa workpiece ndi kuchepetsa zinki zowonongeka chifukwa cha kutaya chitsulo, opanga ambiri amatenga 450 ~ 470 ℃, 0.5 ~ 1.5min. Mafakitole ena amagwiritsa ntchito kutentha kwakukulu pazidutswa zazikulu zogwirira ntchito ndi zitsulo zoponyera chitsulo, koma pewani kutentha komwe kumatayika kwambiri. Pofuna kupititsa patsogolo kutsekemera kwazitsulo zotentha zotentha zotentha kutentha, kuteteza kuti ❖ kuyanika kukhala wandiweyani kwambiri, ndikuwongolera maonekedwe a zokutira, 0.01% mpaka 0.02% ya aluminiyamu yoyera nthawi zambiri imawonjezeredwa. Aluminium iyenera kuwonjezeredwa pang'ono kangapo.
(6) kumaliza
Kumaliza workpiece pambuyo plating makamaka kuchotsa pamwamba nthaka ndi nthaka tinatake tozungulira, mwina ndi kugwedeza kapena pamanja njira.
(7) Chisangalalo
Cholinga chake ndikuwongolera kukana kwa dzimbiri mumlengalenga pamtunda wa chogwirira ntchito, kuchepetsa kapena kukulitsa mawonekedwe a dzimbiri loyera, ndikusunga mawonekedwe abwino a zokutira. Onse ali passivated ndi chromate, monga Na2Cr2O7 80 ~ 100g/L, asidi sulfuric 3 ~ 4ml/L.
(8) Kuziziritsa
Nthawi zambiri imakhala yoziziritsidwa ndi madzi, koma kutentha sikuyenera kutsika kwambiri kuti chogwirira ntchito, makamaka choponyera, chitha kusweka mu matrix chifukwa cha kuzizira ndi kuchepa.
(9) Kuyendera
Maonekedwe a zokutira ndi owala, mwatsatanetsatane, popanda kugwedeza kapena makwinya. makulidwe kuyendera angagwiritse ntchito ❖ kuyanika makulidwe n'zotsimikizira, njira ndi yosavuta. Makulidwe a zokutira amathanso kupezeka mwa kutembenuza kuchuluka kwa zinc adhesion. Mphamvu yomangirira imatha kupindika ndi makina opindika, ndipo chitsanzocho chiyenera kupindika pa 90-180 °, ndipo sipayenera kukhala ming'alu kapena kusenda kwa zokutira. Ikhozanso kuyesedwa pomenya ndi nyundo yolemera.
2. Hot-dip kanasonkhezereka wosanjikiza wosanjikiza Njira yopangira malata yotentha ndi njira yopangira aloyi yachitsulo-zinki pakati pa masanjidwe achitsulo ndi wosanjikiza wakunja koyera wa zinki. chitsulo-zinki aloyi wosanjikiza amapangidwa pamwamba pa workpiece pa otentha-kuviika galvanizing. Chitsulo ndi zinki zoyera zimagwirizanitsidwa bwino, ndipo ndondomekoyi ikhoza kufotokozedwa mophweka ngati: pamene chitsulo chogwiritsira ntchito chitsulo chimamizidwa mu nthaka yosungunuka, njira yolimba ya zinki ndi alpha chitsulo (pachimake cha thupi) imapangidwa poyamba pa mawonekedwe. Uyu ndi kristalo wopangidwa ndi kusungunula maatomu a zinki muchitsulo chachitsulo chokhazikika. Ma atomu awiri achitsulo amasakanikirana, ndipo kukopa pakati pa ma atomu kumakhala kochepa. Chifukwa chake, zinc ikafika pakuchulukira munjira yolimba, ma atomu awiri a zinki ndi chitsulo amafalikira wina ndi mnzake, ndipo maatomu a zinki omwe alowa (kapena kulowa) mu matrix achitsulo amasamukira kumtunda wa matrix, ndipo pang'onopang'ono amapanga aloyi ndi chitsulo, ndi kufalikira Chitsulo ndi zinki mu zinki wosungunuka zimapanga gulu la intermetallic FeZn13, lomwe limamira pansi pa mphika wotentha wa galvanizing, womwe umatchedwa zinki. Pamene workpiece imachotsedwa mu njira yomiza ya zinki, wosanjikiza woyera wa zinc amapangidwa pamwamba, womwe ndi kristalo wa hexagonal. Chitsulo chake sichiposa 0.003%.
Chachitatu, ntchito zoteteza za kutentha-kuviika kanasonkhezereka wosanjikiza Makulidwe a electro-galvanized wosanjikiza kawirikawiri 5-15μm, ndi otentha-kuviika kanasonkhezereka wosanjikiza zambiri pamwamba 65μm, ngakhale mkulu monga 100μm. Kutentha kwa dip galvanizing kumaphimba bwino, zokutira wandiweyani komanso zopanda organic. Monga tonse tikudziwa, njira ya anti-atmospheric corrosion ya zinc imaphatikizapo chitetezo cha makina ndi chitetezo cha electrochemical. Pansi pa mlengalenga wa dzimbiri, pali mafilimu oteteza a ZnO, Zn(OH)2 ndi maziko a zinc carbonate pamwamba pa nthaka wosanjikiza, omwe amatha kuchedwetsa dzimbiri pamlingo wina. Filimu yoteteza (yomwe imadziwikanso kuti dzimbiri loyera) imawonongeka ndipo filimu yatsopano imapangidwa. Chigawo cha zinc chikawonongeka kwambiri ndipo matrix achitsulo ali pachiwopsezo, zinc imatulutsa chitetezo cha electrochemical pamatrix. Mphamvu yeniyeni ya zinc ndi -0.76V, ndipo mphamvu yeniyeni yachitsulo ndi -0.44V. Zinc ndi iron zikapanga microbattery, zinc imasungunuka ngati anode. Imatetezedwa ngati cathode. Mwachiwonekere, galvanizing yotentha yotentha imakhala ndi mpweya wabwino wotsutsa chitsulo chachitsulo kusiyana ndi electro-galvanizing.
Chachinayi, mapangidwe kulamulira zinki phulusa ndi nthaka slag pa otentha-kuviika galvanizing
Phulusa la Zinc ndi zinc phulusa sizimangokhudza kwambiri kumizidwa kwa nthaka, komanso kumapangitsa kuti zokutira zikhale zovuta komanso kutulutsa tinthu tating'onoting'ono ta zinki. Kuphatikiza apo, mtengo wa galvanizing wotentha umakwera kwambiri. Nthawi zambiri, mowa wa zinki ndi 80-120kg pa 1 ton workpiece. Ngati phulusa la zinki ndi zinyalala zili zazikulu, zinc zomwe zimagwiritsidwa ntchito zimakhala zokwera mpaka 140-200kg. Kulamulira nthaka mpweya makamaka kulamulira kutentha ndi kuchepetsa zinyalala opangidwa ndi makutidwe ndi okosijeni wa nthaka madzi pamwamba. Ena opanga zoweta ntchito refractory mchenga, makala phulusa, etc. Mayiko akunja ntchito ceramic kapena galasi mipira ndi otsika matenthedwe madutsidwe, mkulu kusungunuka mfundo, otsika enieni yokoka, ndipo palibe anachita ndi nthaka madzi, amene angathe kuchepetsa kutaya kutentha ndi kuteteza makutidwe ndi okosijeni. Mpira woterewu ndi wosavuta kukankhira kutali ndi chogwirira ntchito, ndipo sichimamatira ku workpiece. Zotsatira zake. Pakuti mapangidwe nthaka zinyalala mu nthaka madzi, makamaka zinki-chitsulo aloyi ndi osauka kwambiri fluidity anapanga pamene chitsulo zili kusungunuka mu nthaka madzi kuposa solubility pa kutentha. Zinc zomwe zili mu zinc dross zimatha kufika pa 95%, zomwe zimakhala zotentha-dip galvanizing. Chinsinsi cha kukwera mtengo kwa zinc. Zitha kuwonedwa kuchokera ku chitsulo chosungunuka chachitsulo mumadzimadzi a zinki kuti kuchuluka kwa chitsulo chosungunuka, ndiko kuti, kuchuluka kwa chitsulo, kumakhala kosiyana ndi kutentha kosiyana komanso nthawi zosiyanasiyana. Pafupifupi 500 ° C, kutayika kwachitsulo kumawonjezeka kwambiri ndi kutentha ndi kusunga nthawi, pafupifupi muubwenzi wozungulira. Pansi kapena pamwamba pa 480 ~ 510 ℃, kutaya kwachitsulo kumawonjezeka pang'onopang'ono ndi nthawi. Chifukwa chake, anthu amatcha 480 ~ 510 ℃ malo oyipa owonongeka. Pakutentha uku, madzi a zinki amawononga chogwirira ntchito ndipo mphika wa zinc uwononga kwambiri. Kutayika kwachitsulo kudzawonjezeka kwambiri pamene kutentha kuli pamwamba pa 560 ℃, ndipo zinki idzasokoneza matrix achitsulo pamene kutentha kuli pamwamba pa 660 ℃. . Choncho, plating panopa ikuchitika m'madera awiri 450-480 ° C ndi 520-560 ° C.
5. Kulamulira kuchuluka kwa zinki phulusa
Kuti muchepetse zinc zinki, m'pofunika kuchepetsa chitsulo chomwe chili mu njira ya zinc, yomwe ndikuyamba ndi kuchepetsa zinthu zomwe zimapanga chitsulo:
⑴Kuyika ndi kuteteza kutentha kuyenera kupewa malo omwe amasungunuka ndi chitsulo, ndiye kuti, osagwira ntchito pa 480 ~ 510 ℃.
⑵ Momwe kungathekere, mphika wa zinki uyenera kuwotcherera ndi mbale zachitsulo zokhala ndi kaboni komanso silicon yotsika. Mpweya wochuluka wa carbon udzafulumizitsa dzimbiri poto ndi nthaka yamadzimadzi, ndipo silicon yapamwamba imatha kulimbikitsanso kuwononga chitsulo ndi madzi a zinki. Pakalipano, mbale zazitsulo za carbon 08F zapamwamba zimagwiritsidwa ntchito kwambiri. Mpweya wake wa kaboni ndi 0.087% (0.05% ~0.11%), silicon ndi ≤0.03%, ndipo imakhala ndi zinthu monga faifi tambala ndi chromium zomwe zimatha kuletsa chitsulo kuti chisawonongeke. Osagwiritsa ntchito chitsulo wamba wa kaboni, apo ayi kugwiritsa ntchito nthaka kudzakhala kwakukulu ndipo moyo wa mphika wa zinki udzakhala waufupi. Anafunsidwanso kuti agwiritse ntchito silicon carbide kuti apange thanki yosungunuka ya zinki, ngakhale kuti imatha kuthetsa kutayika kwachitsulo, koma ndondomeko yachitsanzo ndi vuto.
⑶Kuchotsa masitayilo pafupipafupi. Kutentha kumayamba kukwezedwa kumtunda wapamwamba wa kutentha kwa ndondomeko kuti mulekanitse zinki slag ndi madzi a zinki, kenako amatsitsidwa mpaka pansi pa kutentha kwa ndondomekoyi, kotero kuti slag ya zinc imamira pansi pa thanki ndiyeno imatengedwa. supuni. Zigawo zopukutidwa zomwe zimagwera mumadzi a zinc ziyeneranso kupulumutsidwa pakapita nthawi.
⑷ Ndikofunikira kuletsa chitsulo mu plating agent kuti asalowetsedwe mu thanki ya zinki ndi workpiece. Chitsulo chofiira-bulauni chokhala ndi chitsulo chidzapangidwa pamene plating agent imagwiritsidwa ntchito kwa nthawi inayake, ndipo iyenera kusefedwa nthawi zonse. Ndi bwino kusunga pH mtengo wa plating agent mozungulira 5.
⑸ Zosakwana 0.01% zotayidwa muzitsulo zomangira zimathandizira kupanga zinyalala. Kuchuluka kwa aluminiyumu koyenera sikungowonjezera kusungunuka kwa yankho la zinki ndikuwonjezera kuwala kwa zokutira, komanso kumathandizira kuchepetsa zinki ndi fumbi la zinki. Kachulukidwe kakang'ono ka aluminiyumu kamene kamayandama pamadzimadzi ndi kothandiza kuchepetsa makutidwe ndi okosijeni, ndipo kuchulukira kumakhudza mtundu wa zokutira, zomwe zimapangitsa kuwonongeka kwa malo.
⑹ Kutentha ndi kutentha kuyenera kukhala kofanana kuti kupewe kuphulika ndi kutenthedwa kwanuko.

6


Nthawi yotumiza: Sep-30-2021