Dacromet Bolts: Superior Corrosion Protection thiab xeb tiv thaiv rau niaj hnub Engineering 

2. Nkag siab txog Dacromet Txheej Technology

2.1 Kev sib xyaw thiab cov qauv

Dacromet yog cov txheej txheem zinc-flake txheej txheej tsim tshwj xeeb rau kev tiv thaiv corrosion siab. The coating consists of overlapping microscopic zinc and aluminum flakes suspended in an inorganic binder matrix, typically based on chromium oxides or similar compounds. When applied to a bolt and subsequently cured through a controlled baking process, these flakes align in multiple layers, forming a dense, lamellar barrier that effectively blocks the penetration of corrosive media such as water, oxygen, and chloride ions.

Cov yeeb yaj kiab tuab ntawm Dacromet txheej ntawm lub bolt yog li ntawm 5 txog 15 micrometers. Txawm hais tias qhov profile no nyias nyias, cov qauv multilayered muab cov khoom tshwj xeeb tshwj xeeb. Cov zinc flakes ua sacrificially, nyiam corroding los tiv thaiv cov hlau substrate, thaum lub txhuas Cheebtsam txhim khu tag nrho stability thiab passivation yam ntxwv. Qhov kev ua haujlwm thib ob no yog qhov tseem ceeb rau kev tiv thaiv corrosion zoo heev thiab kev tiv thaiv xeb uas txawv ntawm Dacromet bolts los ntawm cov pa coated fasteners.

2.2 Cov txheej txheem thov

Cov txheej txheem Dacromet txheej pib nrog cov txheej txheem saum npoo ntawm lub ntsia liaj qhov rooj los xyuas kom meej qhov adhesion zoo. Tom qab ntawd cov khoom siv huv huv yog dipped rau hauv lossis txau nrog dej-raws li zinc-aluminium slurry. Tom qab daim ntawv thov, lub coated ntsia liaj qhov rooj tau ua tib zoo tswj xyuas lub voj voog ntawm qhov kub siab. Thaum lub sij hawm no thermal kho, lub inorganic binder crosslinks thiab cov hlau flakes sinter rau hauv ib tug nruam, adherent zaj duab xis uas muab kev tiv thaiv corrosion.

Ib qho txiaj ntsig tseem ceeb tshaj plaws ntawm cov txheej txheem Dacromet rau bolts yog qhov tsis muaj kev txhoj puab heev acid pickling hauv ntau cov txheej txheem sib txawv. Kev lig kev cai electroplating feem ntau yuav tsum muaj zog acid tu, uas tuaj yeem qhia hydrogen rau hauv cov hlau muaj zog thiab ua rau hydrogen embrittlement. Los ntawm kev txo qis lossis tshem tawm qhov kev pheej hmoo no, Dacromet txheej khaws cia cov neeg kho tshuab kev ncaj ncees ntawm lub siab tensile bolts thaum tseem xa cov kev tiv thaiv corrosion zoo thiab tiv thaiv xeb mus ntev.

3. Kev tiv thaiv corrosion thiab xeb tiv thaiv kev ua tau zoo

3.1 Laboratory Performance

Lub peev xwm tiv thaiv corrosion ntawm Dacromet bolts feem ntau suav nrog los ntawm kev ntsuas nruab nrab ntsev tshuaj tsuag raws li ASTM B117 lossis ISO 9227 tus qauv. Cov txheej txheem Dacromet zoo ib txwm ua tiav 720 mus rau ntau dua 1,000 teev ntawm kev raug mob ua ntej pom cov xim liab xeb ntawm lub ntsia liaj qhov rooj. Nyob rau hauv ntau cov txheej txheem siab heev uas suav nrog ntxiv sealers lossis topcoats, kev ua tau zoo tuaj yeem tshaj 1,500 lossis 2,000 teev. Qib no ntawm kev tiv thaiv xeb nyob deb tshaj li cov pa zinc electroplating thiab feem ntau outperforms ib txwm kub-dip galvanizing nyob rau hauv piv rau cov kev xeem.

Tshaj li qhov kev ntsuam xyuas ntsev ntsev zoo li qub, Dacromet bolts ua kom pom kev ua haujlwm zoo hauv kev ntsuas kev tiv thaiv kab mob uas ua kom zoo dua simulate lub ntiaj teb raug. Cov txheej txheem no cuam tshuam nrog lub sijhawm hloov ntawm ntsev pos huab, av noo, thiab ziab, ua rau cov txheej txheem muaj peev xwm tswj tau qhov kev tiv thaiv tsis tu ncua. Cov txheej txheej zinc-aluminium ntawm Dacromet teb tau zoo rau cov xwm txheej zoo li no, tswj kev tiv thaiv kev txhim khu kev ruaj ntseg txawm tias tom qab lub sijhawm ntev thiab cuam tshuam.

3.2 Mechanisms ntawm Kev Tiv Thaiv

Qhov kev tiv thaiv zoo tshaj plaws uas muaj los ntawm Dacromet bolts tau los ntawm ntau yam kev sib koom ua ke. Ua ntej, lub cev thaiv lub cev tsim los ntawm cov hlau nplaum sib tshooj impedes lub diffusion ntawm dej, oxygen, thiab chloride ions mus rau cov hlau substrate. Qhov thib ob, kev ua txhaum ntawm cov zinc flakes muab kev tiv thaiv cathodic ntawm txhua qhov kev cuam tshuam ntawm microscopic hauv txheej. Thib peb, tsim cov khoom ruaj khov corrosion thiab passivation films ntxiv txhim khu kev tiv thaiv xeb mus ntev los ntawm kev sib khi txoj hauv kev rau kev tawm tsam ntxiv. Qhov kev tiv thaiv ntau txheej no tso cai rau Dacromet-coated bolts kom muaj kev ncaj ncees thiab zoo li ntev tshaj li qhov tsis tau kho lossis cov txheej txheem coated fasteners.

4. Qhov tseem ceeb ntawm Dacromet Bolts

Kev ywj pheej los ntawm Hydrogen Embrittlement: Cov bolts muaj zog, tshwj xeeb tshaj yog cov khoom vaj khoom tsev chav kawm 10.9 thiab 12.9, muaj kev cuam tshuam rau hydrogen embrittlement thaum raug cov txheej txheem electroplating ib txwm muaj. Kev nqus ntawm atomic hydrogen thaum lub sij hawm ntxuav cov kua qaub los yog electrolytic deposition tuaj yeem ua rau ncua sij hawm brittle fracture nyob rau hauv tensile load. Dacromet txheej tshuab feem ntau tshem tawm qhov kev txhawj xeeb no vim tias cov txheej txheem tsis cuam tshuam nrog electrolytic hydrogen tiam thiab feem ntau zam cov kua qaub ua ntej. Raws li qhov tshwm sim, engineers tuaj yeem teev cov high-tensile Dacromet bolts nrog kev ntseeg siab tias kev tiv thaiv corrosion yuav tsis cuam tshuam cov neeg kho tshuab kev ntseeg siab lossis kev nyab xeeb.

Nyias, Uniform, thiab Dimensionally Stable Txheej: Tsis zoo li kub-dip galvanizing, uas tuaj yeem tso cov tuab tuab thiab qee zaum tsis sib xws zinc txheej uas cuam tshuam nrog cov xov haum thiab kev sib raug zoo torque-tension, Dacromet txheej yog cov yam ntxwv nyias thiab zoo ib yam. Qhov raug 5-15 µm zaj duab xis tuab kom ntseeg tau tias tus qauv ntsia liaj qhov rooj thiab cov txiv ntoo tolerances tseem sib xws yam tsis tas yuav tsum muaj cov txiv ntseej tshwj xeeb lossis kev txiav cov xov. Qhov kev ruaj ntseg qhov ntev no tshwj xeeb tshaj yog muaj txiaj ntsig hauv kev sib dhos precision thiab kev ua haujlwm nrawm nrawm uas qhov kev sib koom ua ke yog qhov tseem ceeb.

Zoo heev Thaum tshav kub kub Resistance thiab tshuaj Stability: Dacromet coatings muaj qhov zoo tshaj plaws thermal stability, tswj kev tiv thaiv corrosion zoo thiab tiv thaiv xeb ntawm qhov kev pab cuam tas mus li kub txog li 250-300 ° C, nyob ntawm qhov kev tsim tshwj xeeb. Qhov kev tiv thaiv cua sov no ua rau Dacromet bolts haum rau cov ntawv thov nyob ze lub cav, lub tshuab tso pa, qhov cub ua haujlwm, thiab lwm qhov chaw siab-kub qhov chaw uas cov txheej txheem organic yuav degrade. Tsis tas li ntawd, cov txheej txheem inorganic ntawm txheej muab kev ua haujlwm zoo rau ntau yam kev lag luam tshuaj.

Tswj kev sib txhuam thiab kev sib dhos ua haujlwm: Ntau lub tshuab Dacromet suav nrog cov sealers tshwj xeeb lossis cov roj nplua nyeem uas tso cai rau kev tswj xyuas cov coefficient ntawm kev sib txhuam. Qhov no feature yog ib qho tseem ceeb rau kev ua tau zoo ib yam preload nyob rau hauv bolted pob qij txha. Los ntawm kev muab tus cwj pwm kev sib tw torque-nruas, Dacromet bolts txhawb kev txhim khu kev sib koom ua ke thiab txo qhov kev pheej hmoo ntawm qis- lossis dhau-tightening. Kev sib xyaw ua ke ntawm kev tiv thaiv corrosion zoo heev, cov yam ntxwv ntawm kev sib txhuam ruaj khov, thiab kev ywj pheej los ntawm hydrogen embrittlement txoj haujlwm Dacromet raws li kev kho saum npoo zoo rau kev nyab xeeb-tseem ceeb thiab kev ua haujlwm siab.