Kev xaiv cov khoom siv kho kom zoo nkauj yog ib qho teeb meem uas txhua tus neeg tsim qauv ntsib. Muaj ntau hom kev xaiv kho kom zoo nkauj, thiab tus kws tsim qauv qib siab yuav tsum tsis txhob tsuas yog xav txog kev txuag nyiaj thiab kev siv tau ntawm tus qauv xwb, tab sis kuj yuav tsum tau ua tib zoo saib xyuas cov txheej txheem sib dhos thiab txawm tias cov kev cai ib puag ncig. Hauv qab no yog cov lus qhia luv luv txog qee cov txheej txheem siv rau cov khoom siv txuas raws li cov ntsiab cai saum toj no, rau cov kws kho kom zoo nkauj siv.
1. Kev siv hluav taws xob los ua kom kub
Zinc yog cov txheej txheem feem ntau siv rau cov khoom siv txuas lag luam. Tus nqi pheej yig heev, thiab qhov zoo li zoo. Cov xim feem ntau suav nrog dub thiab ntsuab tub rog. Txawm li cas los xij, nws qhov kev ua tau zoo tiv thaiv xeb yog qhov nruab nrab, thiab nws qhov kev ua tau zoo tiv thaiv xeb yog qhov qis tshaj plaws ntawm cov txheej zinc plating (txheej) . Feem ntau, kev sim tshuaj tsuag ntsev nruab nrab ntawm cov hlau galvanized yog ua tiav hauv 72 teev, thiab cov neeg sawv cev tshwj xeeb kuj siv los xyuas kom meej tias kev sim tshuaj tsuag ntsev nruab nrab kav ntev dua 200 teev. Txawm li cas los xij, tus nqi kim heev, uas yog 5-8 npaug ntawm cov hlau galvanized ib txwm.
Cov txheej txheem ntawm electrogalvanizing yog qhov yooj yim rau hydrogen embrittlement, yog li bolts saum toj no qib 10.9 feem ntau tsis kho nrog galvanizing. Txawm hais tias hydrogen tuaj yeem tshem tawm siv lub qhov cub tom qab plating, zaj duab xis passivation yuav raug puas tsuaj ntawm qhov kub siab tshaj 60 ℃, yog li hydrogen tshem tawm yuav tsum tau ua tom qab electroplating thiab ua ntej passivation. Qhov no muaj kev ua haujlwm tsis zoo thiab cov nqi ua tiav siab. Qhov tseeb, cov chaw tsim khoom dav dav tsis nquag tshem tawm hydrogen tshwj tsis yog tias cov neeg siv khoom tshwj xeeb tau hais kom ua.
Qhov sib xws ntawm lub zog torque thiab lub zog ua ntej ntawm cov galvanized fasteners tsis zoo thiab tsis ruaj khov, thiab feem ntau lawv tsis siv rau kev txuas cov khoom tseem ceeb. Txhawm rau txhim kho qhov sib xws ntawm lub zog preload, txoj kev ntawm kev txheej cov tshuaj lubricating tom qab plating kuj tseem siv tau los txhim kho thiab txhim kho qhov sib xws ntawm lub zog preload.
2. Phosphating
Lub hauv paus ntsiab lus tseem ceeb yog tias phosphating pheej yig dua li galvanizing, tab sis nws qhov kev tiv thaiv corrosion phem dua li galvanizing. Tom qab phosphating, yuav tsum tau siv roj, thiab nws qhov kev tiv thaiv corrosion muaj feem cuam tshuam nrog kev ua haujlwm ntawm cov roj siv. Piv txwv li, tom qab phosphating, siv cov roj tiv thaiv xeb dav dav thiab ua qhov kev sim ntsev tsuag tsis muaj zog rau 10-20 teev xwb. Kev siv cov roj tiv thaiv xeb qib siab tuaj yeem siv sijhawm txog 72-96 teev. Tab sis nws tus nqi yog 2-3 npaug ntawm cov roj phosphating dav dav.
Muaj ob hom phosphating uas siv ntau rau cov khoom siv txuas, zinc phosphating thiab manganese phosphating. Zinc phosphating muaj kev ua haujlwm zoo dua li manganese phosphating, thiab manganese phosphating muaj kev tiv thaiv corrosion thiab hnav zoo dua li zinc plating. Nws tuaj yeem siv rau ntawm qhov kub ntawm 225 txog 400 degrees Fahrenheit (107-204 ℃). Tshwj xeeb tshaj yog rau kev txuas qee yam tseem ceeb. Xws li cov ntsia hlau txuas thiab cov txiv ntoo ntawm lub cav, lub taub hau lub tog raj kheej, lub cev tseem ceeb, cov ntsia hlau flywheel, cov ntsia hlau log thiab cov txiv ntoo, thiab lwm yam.
Cov ntsia hlau muaj zog siv phosphating, uas kuj tseem tuaj yeem zam cov teeb meem hydrogen embrittlement. Yog li ntawd, cov ntsia hlau saum qib 10.9 hauv kev lag luam feem ntau siv kev kho qhov chaw phosphating.
3. Oxidation (ua dub)
Kev pleev xim dub + roj yog ib qho txheej txheem nrov rau cov khoom siv sib txuas hauv kev lag luam vim nws pheej yig tshaj plaws thiab zoo nkauj ua ntej siv roj. Vim nws ua rau dub, nws yuav luag tsis muaj peev xwm tiv thaiv xeb, yog li nws yuav xeb sai sai yam tsis muaj roj. Txawm tias nyob hauv qhov muaj roj, kev sim tshuaj tsuag ntsev tsuas yog kav ntev li 3-5 teev xwb.
4. Kev faib hluav taws xob
Kev siv cadmium plating muaj kev tiv thaiv xeb zoo heev, tshwj xeeb tshaj yog nyob rau hauv cov huab cua hauv dej hiav txwv, piv rau lwm yam kev kho saum npoo. Tus nqi kho cov kua dej khib nyiab hauv cov txheej txheem electroplating cadmium siab, thiab nws tus nqi yog li 15-20 npaug ntawm electroplating zinc. Yog li nws tsis siv rau hauv kev lag luam dav dav, tsuas yog rau cov chaw tshwj xeeb. Cov khoom siv rau cov chaw khawb roj thiab HNA dav hlau.
5. Chromium plating
Cov txheej chromium ruaj khov heev hauv huab cua, tsis yooj yim hloov xim thiab poob ci ntsa iab, thiab muaj qhov nyuaj siab thiab tiv taus kev hnav zoo. Kev siv chromium plating rau ntawm cov fasteners feem ntau yog siv rau kev kho kom zoo nkauj. Nws tsis tshua siv rau hauv cov teb kev lag luam uas muaj kev xav tau kev tiv thaiv corrosion siab, vim tias cov fasteners chrome plated zoo kuj kim ib yam li cov hlau tsis xeb. Tsuas yog thaum lub zog hlau tsis xeb tsis txaus, cov fasteners chrome plated raug siv hloov.
Yuav kom tiv thaiv tau xeb, tooj liab thiab nickel yuav tsum tau plated ua ntej chrome plating. Lub txheej chromium tuaj yeem tiv taus qhov kub siab ntawm 1200 degrees Fahrenheit (650 ℃). Tab sis kuj muaj teeb meem ntawm hydrogen embrittlement, zoo ib yam li electrogalvanizing.
6. Nickel plating
Feem ntau siv rau hauv cov cheeb tsam uas xav tau kev tiv thaiv xeb thiab kev coj hluav taws xob zoo. Piv txwv li, cov qhov tawm ntawm cov roj teeb tsheb.
7. Kub-dip galvanizing
Kev kub dip galvanizing yog ib txheej thermal diffusion ntawm zinc uas raug cua sov rau hauv kua. Lub thickness ntawm txheej yog ntawm 15 thiab 100 μ m. Thiab nws tsis yooj yim rau kev tswj hwm, tab sis muaj kev tiv thaiv corrosion zoo thiab feem ntau siv hauv kev tsim kho. Thaum lub sijhawm kub dip galvanizing, muaj kev ua qias tuaj loj heev, suav nrog cov khib nyiab zinc thiab cov pa zinc.
Vim yog lub txheej tuab, nws ua rau muaj teeb meem hauv kev ntsia hlau rau hauv cov xov sab hauv thiab sab nraud ntawm cov khoom siv sib txuas. Vim yog qhov kub ntawm kev ua cov txheej txheem kub-dip galvanizing, nws tsis tuaj yeem siv rau cov khoom siv sib txuas siab dua qib 10.9 (340 ~ 500 ℃).
8. Kev nkag mus ntawm zinc
Zinc infiltration yog ib txheej txheej thermal diffusion ntawm cov hmoov zinc. Nws qhov sib xws zoo, thiab ib txheej sib xws tuaj yeem tau txais hauv ob qho tib si xov thiab qhov dig muag. Plating tuab yog 10-110 μ m. Thiab qhov yuam kev tuaj yeem tswj tau ntawm 10%. Nws lub zog sib txuas thiab kev ua haujlwm tiv thaiv xeb nrog lub substrate yog qhov zoo tshaj plaws hauv zinc coatings (xws li electrogalvanizing, hot-dip galvanizing, thiab Dacromet). Nws cov txheej txheem ua yog tsis muaj kuab paug thiab zoo tshaj plaws rau ib puag ncig.
9. Dacromet
Tsis muaj teeb meem hydrogen embrittlement, thiab qhov kev ua tau zoo ntawm torque preload zoo heev. Tsis tas yuav xav txog chromium thiab cov teeb meem ib puag ncig, Dacromet yog qhov tsim nyog tshaj plaws rau cov fasteners muaj zog nrog cov kev xav tau tiv thaiv corrosion siab.
Lub sijhawm tshaj tawm: Tsib Hlis-19-2023
