Kev xaiv ntawm kev kho deg yog ib qho teeb meem uas txhua tus neeg tsim qauv ntsib. Muaj ntau ntau hom kev kho mob saum npoo av muaj, thiab tus tsim qauv qib siab yuav tsum tsis tsuas yog xav txog kev lag luam thiab kev ua tau zoo ntawm kev tsim, tab sis kuj tseem them nyiaj rau cov txheej txheem sib dhos thiab txawm tias ib puag ncig yuav tsum tau ua. Hauv qab no yog cov lus qhia luv luv rau qee cov txheej txheem feem ntau siv rau fasteners raws li cov hauv paus ntsiab lus saum toj no, rau kev siv los ntawm cov kws kho mob fastener.
1. Electrogalvanizing
Zinc yog cov txheej txheem feem ntau siv rau kev lag luam fasteners. Tus nqi kuj pheej yig, thiab cov tsos yog zoo. Cov xim muaj xws li dub thiab ntsuab ntsuab. Txawm li cas los xij, nws qhov kev tiv thaiv corrosion yog qhov nruab nrab, thiab nws cov kev ua haujlwm tiv thaiv corrosion yog qis tshaj ntawm zinc plating (txheej) txheej. Feem ntau, qhov nruab nrab ntsev tsuag tshuaj ntsuam ntawm galvanized steel yog nqa tawm nyob rau hauv 72 teev, thiab tshwj xeeb sealing agents kuj tau siv los xyuas kom meej tias qhov nruab nrab ntsev tsuag tshuaj ntsuam kav ntev tshaj 200 teev. Txawm li cas los xij, tus nqi yog kim, uas yog 5-8 npaug ntawm cov hlau galvanized zoo tib yam.
Cov txheej txheem ntawm electrogalvanizing yog nquag rau hydrogen embrittlement, yog li bolts saum qib 10.9 feem ntau tsis kho nrog galvanizing. Txawm hais tias hydrogen tuaj yeem raug tshem tawm siv qhov cub tom qab plating, zaj duab xis passivation yuav raug puas tsuaj ntawm qhov kub siab tshaj 60 ℃, yog li kev tshem tawm hydrogen yuav tsum tau ua tom qab electroplating thiab ua ntej passivation. Qhov no muaj kev ua haujlwm tsis zoo thiab cov nqi ua haujlwm siab. Hauv kev muaj tiag, cov chaw tsim khoom siv dav dav tsis nquag tshem tawm hydrogen tshwj tsis yog raug yuam los ntawm cov neeg siv khoom tshwj xeeb.
Qhov sib xws ntawm torque thiab pre nruj quab yuam ntawm galvanized fasteners yog qhov tsis zoo thiab tsis ruaj khov, thiab lawv feem ntau tsis siv rau kev txuas qhov tseem ceeb. Txhawm rau txhim kho qhov sib xws ntawm torque preload, cov txheej txheem ntawm txheej lubricating tshuaj tom qab plating kuj siv tau los txhim kho thiab txhim kho qhov sib xws ntawm torque preload.
2. Phosphating
Lub hauv paus ntsiab lus yog tias phosphating kuj pheej yig dua li galvanizing, tab sis nws cov corrosion kuj yog phem dua galvanizing. Tom qab phosphating, roj yuav tsum tau siv, thiab nws cov corrosion kuj yog ze rau kev ua tau zoo ntawm cov roj thov. Piv txwv li, tom qab phosphating, thov ib tug general anti xeb roj thiab ua ib tug nruab nrab ntsev tshuaj tsuag rau 10-20 teev xwb. Kev siv cov roj qib siab tiv thaiv xeb tuaj yeem siv sijhawm txog 72-96 teev. Tab sis nws tus nqi yog 2-3 npaug ntawm cov roj phosphating.
Muaj ob hom kev siv phosphating rau fasteners, zinc raws phosphating thiab manganese raws phosphating. Zinc raws phosphating muaj lubrication zoo dua li manganese raws li phosphating, thiab manganese raws phosphating muaj zoo corrosion kuj thiab hnav tsis kam tshaj zinc plating. Nws tuaj yeem siv tau ntawm qhov kub ntawm 225 txog 400 degrees Fahrenheit (107-204 ℃). Tshwj xeeb tshaj yog rau kev sib txuas ntawm qee yam tseem ceeb. Xws li txuas tus pas nrig bolts thiab ceev ntawm lub cav, lub tog raj kheej taub hau, lub ntsiab bearing, flywheel bolts, log bolts thiab ceev, thiab lwm yam.
Lub zog muaj zog bolts siv phosphating, uas tuaj yeem zam cov teeb meem hydrogen embrittlement. Yog li ntawd, bolts saum qib 10.9 hauv kev lag luam feem ntau siv phosphating nto kho.
3. Oxidation (blackening)
Blackening + oiling yog txheej nrov rau kev lag luam fasteners vim nws yog qhov pheej yig tshaj plaws thiab zoo li ua ntej siv roj. Vim nws blackening, nws yuav luag tsis muaj peev xwm tiv thaiv xeb, yog li nws yuav xeb sai sai yam tsis muaj roj. Txawm tias nyob rau hauv lub xub ntiag ntawm cov roj, qhov kev ntsuam xyuas ntsev tsuag tsuas yog nyob rau 3-5 teev.
4. Electroplating muab faib
Cadmium plating muaj corrosion kuj zoo heev, tshwj xeeb tshaj yog nyob rau hauv marine atmospheric ib puag ncig, piv rau lwm cov kev kho deg. Cov nqi kho cov kua khib nyiab hauv cov txheej txheem ntawm electroplating cadmium yog siab, thiab nws tus nqi yog li 15-20 npaug ntawm electroplating zinc. Yog li nws tsis yog siv hauv kev lag luam dav dav, tsuas yog rau ib puag ncig tshwj xeeb. Fasteners siv rau roj drilling platforms thiab HNA aircraft.
5. Chromium plating
Lub chromium txheej yog ruaj khov heev nyob rau hauv cov huab cua, tsis yooj yim rau hloov xim thiab poob luster, thiab muaj siab hardness thiab zoo hnav tsis kam. Kev siv cov chromium plating ntawm fasteners feem ntau yog siv rau kev kho kom zoo nkauj. Nws yog tsis tshua muaj siv nyob rau hauv industrial teb nrog siab corrosion kuj yuav tsum tau, raws li zoo chrome plated fasteners yog sib npaug kim li stainless hlau. Tsuas yog thaum lub zog stainless hlau tsis txaus, chrome plated fasteners tau siv hloov.
Txhawm rau tiv thaiv corrosion, tooj liab thiab npib tsib xee yuav tsum tau plated ua ntej chrome plating. Cov txheej txheej chromium tuaj yeem tiv taus qhov kub ntawm 1200 degrees Fahrenheit (650 ℃). Tab sis kuj tseem muaj teeb meem ntawm hydrogen embrittlement, zoo ib yam li electrogalvanizing.
6. Nickel plating
Feem ntau siv nyob rau hauv cov cheeb tsam uas yuav tsum tau ob qho tib si anti-corrosion thiab zoo conductivity. Piv txwv li, cov terminals tawm ntawm lub tsheb roj teeb.
7. Kub-dip galvanizing
Kub dip galvanizing yog thermal diffusion txheej ntawm zinc rhuab rau cov kua. Cov txheej thickness yog nruab nrab ntawm 15 thiab 100 μ m. Thiab nws tsis yog yooj yim los tswj, tab sis muaj kev tiv thaiv corrosion zoo thiab feem ntau siv hauv engineering. Thaum lub sij hawm kub dip galvanizing txheej txheem, muaj kuab paug hnyav, nrog rau zinc pov tseg thiab zinc vapor.
Vim yog txheej tuab, nws tau ua rau muaj teeb meem hauv kev sib tw hauv cov xov sab hauv thiab sab nraud hauv fasteners. Vim tias qhov kub-dip galvanizing ua tiav, nws tsis tuaj yeem siv rau fasteners saum qib 10.9 (340 ~ 500 ℃).
8. Zinc infiltration
Zinc infiltration yog cov khoom metallurgical thermal diffusion txheej ntawm zinc hmoov. Nws uniformity yog zoo, thiab ib tug uniform txheej yuav tau txais nyob rau hauv ob threads thiab qhov muag tsis pom qhov. Plating thickness yog 10-110 μ m. Thiab qhov yuam kev tuaj yeem tswj tau ntawm 10%. Nws lub zog sib txuas thiab kev tiv thaiv corrosion nrog lub substrate yog qhov zoo tshaj plaws hauv zinc txheej (xws li electrogalvanizing, kub-dip galvanizing, thiab Dacromet). Nws cov txheej txheem ua yog tsis muaj kuab paug thiab feem ntau ib puag ncig tus phooj ywg.
9. Dacromet
Tsis muaj qhov teeb meem hydrogen embrittlement, thiab lub torque preload sib xws kev ua tau zoo heev. Tsis xav txog cov teeb meem chromium thiab ib puag ncig, Dacromet yog qhov tsim nyog tshaj plaws rau cov khoom siv muaj zog nrog siab tiv thaiv corrosion.
Post lub sij hawm: May-19-2023
