Kev xaiv ntawm kev kho deg yog qhov teeb meem uas txhua tus tsim qauv ntsej muag. Muaj ntau hom kev kho mob nto muaj, thiab ib qib tsim qauv yuav tsum tsis tsuas yog xav txog kev lag luam, tab sis kuj them nyiaj rau cov txheej txheem los ua ke thiab txawm tias ib puag ncig. Hauv qab no yog cov lus qhia luv luv rau qee cov txheej txheej uas nquag siv rau cov neeg ua haujlwm fastenters raws li cov qauv qhia saum toj no.
1. Electrogalvanizing
Zinc yog qhov feem ntau siv txheej rau kev ua lag luam fasteners. Tus nqi yog tus tseem ceeb, thiab cov tsos yog qhov zoo. Cov xim uas cov xim muaj xws li dub thiab tub rog ntsuab. Txawm li cas los xij, nws txoj kev ua tau zoo ntawm corrosion yog qhov nruab nrab, thiab nws txoj kev ua haujlwm tiv thaiv corrosion yog qhov qis tshaj ntawm zinc plating (txheej). Feem ntau, lub nruab nrab ntsev tsuag tshuaj ntsuam ntawm cov hlau galvanized yog nqa tawm hauv 72 teev, thiab tshwj xeeb salceal tshuaj tsuag mus ntau tshaj li 200 teev. Txawm li cas los xij, tus nqi kim kim, uas yog 5-8 zaug uas muaj steel galvanized.
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 muaj tau tshem tawm siv ib lub cub tom qab plating, lub passive zaj duab xis yuav ua rau kub siab tshaj 60 ℃, yog li hydrogen tshem tawm yuav tsum tau nqa tawm tom qab electroplating thiab ua ntej passivation. Qhov no muaj cov kev ua haujlwm tsis zoo thiab cov nqi siab. Nyob rau hauv kev muaj tiag, ntsuas cov nroj tsuag ntau lawm tsis nquag tshem tawm hydrogen ntau tshwj tsis yog tias yuav tsum tau sau tseg cov neeg siv khoom tshwj xeeb.
Qhov sib xws ntawm torque thiab ua rau ntom ntom nti ntawm galvanized fasteners yog neeg pluag thiab tsis ruaj khov, thiab lawv feem ntau tsis siv rau kev sib txuas ntu tseem ceeb. Txhawm rau txhim kho kev sib txawv ntawm torque preload, tus txheej ntawm cov roj lubricating tom qab plating kuj tseem siv tau los txhim kho thiab txhim kho lub zog ntawm torque preloto.
2. Phosphating
Ib qho tseem ceeb yog tias phosphatating yog tus nqi pheej yig dua li galvanizing, tab sis nws corrosion kuj yog qhov phem dua li galvanizing. Tom qab phosphating, roj yuav tsum tau thov, thiab nws txoj kev tiv thaiv corrosion yog ze rau kev ua tau zoo ntawm cov roj thov. Piv txwv li, tom qab phosphating, thov ib qho kev tiv thaiv cov roj xeb thiab ua cov tshuaj ntsev nruab nrab ntawm 10-20 teev. Ua ntawv thov High-qib anti xeb roj tuaj yeem siv sijhawm li 72-96 teev. Tab sis nws tus nqi yog 2-3 zaug ntawm cov roj Phospating General.
Muaj ob hom kev siv phosphating phospating rau lub ntsej muag, Zinc raws li phosphaating thiab manganese raws phosphatating. Zinc raws phosphating muaj zoo dua li kev ua tau zoo ntawm kev ua tau zoo tshaj li manganese raws li manganese raws zoo corrosion tsis kam thiab coj tawm tsam ntau dua li zinc plating. Nws tuaj yeem siv nyob rau ntawm qhov kub thiab txias txij li 225 txog 400 degrees Fahrenheit (107-204 ℃). Tshwj xeeb tshaj yog rau kev sib txuas ntawm qee cov khoom tseem ceeb. Xws li txuas tus pas nrig Bolts thiab ceev ntawm lub cav, lub taub hau lub tog raj kheej, flywheel bolts, log bolts thiab lwm yam.
Siab dua lub zog siv phosphating, uas tseem tuaj yeem zam rau hydrogen embrittlement. Yog li ntawd, bolts saum toj qib 40.9 hauv cov teb muaj cov tshuaj phosphats kev kho sab nrauv.
3. Oxidation (blackening)
DUB + OLING YOG IB TUG ZAUB RAU COV KHOOM UAS LASTENDERS vim tias nws yog qhov pheej yig tshaj thiab zoo nkaus li zoo ua ntej siv roj. Vim nws blackening, nws tau yuav luag tsis muaj kev tiv thaiv xeb, yog li nws yuav xeb nrawm tau yam tsis muaj roj. Txawm tias muaj roj, kev kuaj ntsev yuav tsuas kav 3-5 teev.
4. Electroplating muab faib
Cadmium plating tau ua tau zoo heev corrosion tsis kam, tshwj xeeb tshaj yog nyob rau hauv lub teb chaws ib puag ncig, piv rau lwm txoj kev kho nyob saum npoo. Cov khoom pov tseg kev siv cov nqi hauv cov txheej txheem ntawm cov tshuab hluav taws xob hluav taws xob yog qhov siab, thiab nws tus nqi yog li 15-20 lub sij hawm uas ntawm electroplating zinc. Yog li nws tsis yog siv nyob rau 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 qhov ruaj khov nyob rau hauv cov huab cua, tsis yooj yim hloov xim thiab plam luster, thiab muaj siab tawv thiab hnav tsis kam. Kev siv ntawm chromium plating ntawm cov fasteners feem ntau siv rau lub hom phiaj zoo nkauj. Nws tsis tshua muaj siv nyob rau hauv kev lag luam teb nrog kev ua siab tiv thaiv kev xav tau, zoo li cov chrome zoo plated plated fasteners yog qhov sib npaug raws li stainless hlau. Tsuas yog thaum lub zog hlau stainless lub zog yog tsis txaus, chrome plated fasteners yog siv xwb.
Txhawm rau tiv thaiv corrosion, tooj liab thiab npib tsib xee yuav tsum plated ua ntej chrome plating. Lub chromium txheej tuaj yeem tiv thaiv ntau kub ntawm 1200 degrees Fahrenheit (650 ℃). Tab sis kuj tseem muaj teeb meem ntawm hydrogen embrittlement, zoo ib yam li electrogalvanizing.
6. Nickel plating
Mas siv nyob rau hauv cov cheeb tsam uas yuav tsum tau ob qho tib si tiv thaiv corrosion thiab kev ua haujlwm zoo. Piv txwv li, cov kev tawm ntawm cov roj teeb ntawm lub tsheb.
7. Kub-DIP Galvanizing
Kub Dip Galvanizing yog qhov thermal diffusion txheej ntawm zinc rhuab rau ib qho kua. Lub coating tuab yog nruab nrab ntawm 15 thiab 100 μ m. Thiab nws tsis yooj yim los tswj, tab sis muaj zoo corrosion tsis kam thiab feem ntau siv hauv kev tsim khoom. Thaum lub sij hawm kub dip galvanizing txheej txheem, muaj kuab paug hnyav, suav nrog zinc pov thiab zinc vapor.
Vim yog cov txheej tuab, nws tau ua rau muaj teeb meem hauv screwing hauv sab hauv thiab sab zaj xov hauv fasteners. Vim tias qhov ntsuas kub ntawm kub-dip galvanizing kev ua, nws tsis tuaj yeem siv rau fasteners saum toj kawg nkaus qib 10.9 (340 ~ 500 ℃).
8. Zinc infiltration
Zinc Infiltration yog cov khoom siv metallurgical Thermal diffusion txheej ntawm zinc hmoov ntawm cov hmoov. Nws cov kev sib tw zoo yog qhov zoo, thiab ib txheej sib dhos tuaj yeem tau txais hauv ob qho xov thiab lub qhov muag dig. Plating thickness yog 10-110 μ m. Thiab qhov yuam kev tuaj yeem tswj tau ntawm 10%. Nws txoj kev sib raug zoo lub zog thiab kev tawm tsam corrosion nrog substrate yog qhov zoo tshaj plaws hauv zinc txheej txheem, kub-dip galvanizing, thiab dacromet). Nws txoj kev ua tiav yog cov pa phem-dawb thiab cov phooj ywg zoo tshaj plaws.
9. Dacromet
Tsis muaj hydrogen embrittlement teeb meem, thiab lub zog preload sib xws ua tau kev ua tau zoo heev. Tsis tas xaiv cov teeb meem chromium thiab cov teeb meem ib puag ncig, dacromet yog qhov tsim nyog tshaj plaws rau high-lub zog fasteners nrog siab anti-corrosion.
Lub Sijhawm Post: Tsib Hlis-19-2023
