Yuav luag tag nrhofastenersyog ua los ntawm carbon steel, alloy steel, dav fasteners cia siab tias yuav tiv thaiv corrosion. Tsis tas li ntawd, cov txheej txheem ntawm kev kho deg yuav tsum ua raws nraim.
Rau kev kho saum npoo, tib neeg feem ntau them nyiaj rau kev zoo nkauj thiab kev tiv thaiv corrosion, tab sis lub luag haujlwm tseem ceeb ntawm fasteners yog txhawm rau txhawm rau txuas, thiab kev kho saum npoo kuj muaj txiaj ntsig zoo rau kev ua haujlwm ntawm fasteners. Yog li ntawd, thaum xaiv qhov kev kho mob saum npoo, qhov tseem ceeb ntawm kev ua kom nrawm nrawm yuav tsum tau txiav txim siab, uas yog, qhov sib xws ntawm kev teeb tsa torque-pretightening quab yuam.
Qib siabfastenerdesigner yuav tsum tsis tsuas yog xav txog tus tsim, tab sis kuj xyuam xim rau manufacturability ntawm sib dhos thiab txawm ib puag ncig tiv thaiv yuav tsum tau. Cov hauv qab no yog cov lus qhia luv luv rau qee cov txheej txheem feem ntau siv rau fasteners raws li cov ntsiab lus saum toj no rau kev siv los ntawm cov kws kho mob fastener.
1, Plating
Lub electroplating ntawm fasteners yog hais txog immersing qhov chaw ntawm fasteners uas yuav tsum tau electroplated nyob rau hauv ib tug tshwj xeeb aqueous tov. Cov tshuaj aqueous yuav muaj qee cov khoom siv hlau tso, yog li tom qab tam sim no dhau los ntawm cov tshuaj aqueous, cov tshuaj hlau hauv cov tshuaj yog precipitated thiab txuas rau saum npoo. Immersed ib feem ntawm lub fastener. Electroplating ntawm fasteners feem ntau suav nrog galvanized, tooj liab, npib tsib xee, chromium, tooj liab-nickel alloy, thiab lwm yam.
2, phosphating
Phosphating yog pheej yig dua galvanizing, thiab nws cov corrosion kuj yog phem dua galvanizing. Muaj ob feem ntau siv fastener phosphating, zinc phosphating thiab manganese phosphating. Zinc-based phosphating muaj lubricity zoo dua li manganese-based phosphating, thiab manganese-based phosphating muaj qhov zoo dua corrosion thiab hnav tsis kam tshaj galvanized. Phosphating khoom xws li cav txuas qws bolts, ceev, lub tog raj kheej taub hau, lub ntsiab bearings, flywheel bolts, log bolts thiab ceev, thiab lwm yam.
3, oxidation (blackening)
Blackened plus oiled yog ib qho nrov plating rau kev lag luam fasteners vim nws yog qhov pheej yig tshaj plaws thiab zoo nkaus li zoo kom txog thaum cov roj ntws tawm. Txij li thaum blackening yuav luag tsis muaj peev xwm los tiv thaiv xeb, nws yuav xeb sai sai yam tsis muaj roj. Txawm tias nyob rau hauv lub xeev cov roj, qhov nruab nrab ntsev tshuaj tsuag tuaj yeem ncav cuag 3 ~ 5 teev xwb.
4, kub dip galvanizing
Kub-dip galvanizing yog lub tshav kub-diffusion txheej uas zinc yog rhuab rau hauv cov kua. Lub thickness ntawm txheej yog 15 ~ 100μm, thiab nws tsis yooj yim rau kev tswj, tab sis nws muaj corrosion kuj zoo thiab feem ntau yog siv hauv engineering. Vim qhov kub-dip galvanizing (340-500C), nws tsis tuaj yeem siv rau fasteners saum qib 10.9. Kev kho kub-dip galvanizing ntawm fasteners yog kim dua li electroplating.
5, kev txiav txim siab
Zinc sheathing 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 threads thiab qhov muag tsis pom qhov. Cov txheej tuab yog 10 ~ 110μm, thiab qhov yuam kev tuaj yeem tswj tau li ntawm 10 feem pua. Nws lub zog sib txuas nrog lub substrate thiab cov khoom tiv thaiv corrosion yog qhov zoo tshaj plaws ntawm zinc txheej (electrogalvanized, kub-dip galvanized, Dacromet). Nws cov txheej txheem ua yog tsis muaj kuab paug thiab feem ntau ib puag ncig tus phooj ywg. Yog hais tias tus nqi ntawm chromium thiab ib puag ncig tiv thaiv teeb meem tsis raug txiav txim siab, nws yog qhov tsim nyog tshaj plaws rau cov khoom siv muaj zog nrog siab tiv thaiv corrosion.
Lub hom phiaj tseem ceeb ntawm kev kho saum npoo ntawm fasteners yog ua kom lub fastener nws tus kheej tau txais kev tiv thaiv corrosion, thiaj li ua rau kom muaj kev ntseeg siab thiab hloov tau ntawm lub fastener.
