Dacromet Coated Flange Bolts 

2. Nkag siab txog Dacromet Txheej Technology

Dacromet yog dej-raws li, uas tsis yog-electrolytic zinc-aluminium flake txheej txheej txheem tshwj xeeb tsim rau cov fasteners, nrog rau lub zog siab flange bolts. Tsis zoo li cov txheej txheem electroplating ib txwm tso cov hlau ions los ntawm cov hluav taws xob tam sim no, cov txheej txheem Dacromet siv cov txheej txheem ua tib zoo slurry uas muaj zinc flakes, aluminium flakes, thiab inorganic binders rau ntawm qhov ntsia liaj qhov rooj. Tom qab daim ntawv thov los ntawm dip-spin los yog tshuaj tsuag txoj kev, cov bolts coated nyob rau hauv high-temperature curing (feem ntau nyob ib ncig ntawm 300 ° C), uas sinters cov flakes mus rau hauv ib tug nruj bonded, multi-layered tiv thaiv zaj duab xis.

Qhov tshwm sim Dacromet txheej yog nyias nyias - feem ntau ntawm 6 thiab 12 micrometers - tseem muab cov kev tiv thaiv corrosion zoo heev. Lub overlapping zinc thiab aluminium flakes tsim lub labyrinthine barrier uas ua rau qeeb qhov nkag ntawm noo noo, oxygen, thiab corrosive ions. Nyob rau tib lub sijhawm, zinc muab kev tiv thaiv kev txi (cathodic) rau hauv qab steel substrate ntawm lub ntsia liaj qhov rooj, thaum lub txhuas thiab chromate Cheebtsam txhim khu passivation thiab tag nrho cov anti-xeb durability. Qhov kev tiv thaiv ntau lub tshuab no yog ib qho ntawm cov laj thawj tseem ceeb Dacromet ua haujlwm zoo dua cov zinc plating thiab txawm tias kub-dip galvanizing hauv ntau qhov kev ntsuam xyuas corrosion.

Qhov tseem ceeb, vim tias cov txheej txheem Dacromet tsis muaj cov kua qaub thiab tsis muaj electrolytic deposition, nws qhia tsis muaj hydrogen rau hauv cov hlau lattice ntawm lub ntsia liaj qhov rooj. Cov txheej txheem tseem ceeb no ua rau Dacromet txheej ua tiav hydrogen embrittlement dawb - qhov kev txiav txim siab zoo thaum txheej txheej high-tensile flange bolts ntawm qib 10.9, 12.9, lossis ASTM A490 specification.

3. Qhov tseem ceeb ntawm Dacromet Flange Bolts

3.1 Exceptional Corrosion Resistance thiab Anti-xeb kev ua tau zoo

Dacromet coated flange bolts tsis tu ncua ua tiav ntau tshaj 1,000 teev ntawm nruab nrab ntsev tsuag tshuaj tiv thaiv (ASTM B117 / ISO 9227) yam tsis muaj qhov pom ntawm xeb liab. Hauv ntau qib kev lag luam, cov xeb dawb kuj tseem ncua dhau 240 teev. Qib no ntawm kev tiv thaiv xeb nyob deb tshaj li cov txheej txheem electroplated zinc txheej, uas feem ntau pom cov xeb liab nyob rau hauv 72 mus rau 200 teev nyob rau hauv cov xwm txheej zoo tib yam. Lub superior corrosion kuj ntawm Dacromet stems los ntawm nws cov qauv flake tshwj xeeb thiab kev ua haujlwm ntawm kev tiv thaiv kev tiv thaiv, kev tiv thaiv zinc, thiab tshuaj lom neeg passivation.

Nyob rau hauv lub ntiaj teb no tiag tiag - ntug hiav txwv dej, cov nroj tsuag muaj tshuaj lom neeg, tsheb underbodies, thiab offshore platforms - Dacromet flange bolts tuav lawv kev ncaj ncees ntev dua li conventionally coated fasteners. Cov txheej zoo tiv thaiv ob qho tib si corrosion thiab hauv zos pitting, kom ntseeg tau tias lub bolt tseem muab kev ruaj ntseg clamping quab yuam thoob plaws hauv nws lub neej kev pabcuam. Qhov kev muaj peev xwm tiv thaiv xeb zoo tshaj plaws no txhais tau ncaj qha rau hauv kev txo tus nqi kho, tsawg dua kev kaw tsis tau npaj tseg, thiab txhim kho kev nyab xeeb ntawm cov qauv.

3.2 Ua tiav Hydrogen Embrittlement Dawb

Ib qho ntawm qhov tseem ceeb tshaj plaws ntawm Dacromet txheej rau flange bolts yog tias nws yog qhov tsis muaj hydrogen embrittlement dawb. High-strength steel bolts yog tshwj xeeb tshaj yog raug rau hydrogen embrittlement, ib tug tshwm sim nyob rau hauv uas atomic hydrogen diffuses mus rau hauv lub steel microstructure, txo ductility, thiab yuav ua rau tam sim ntawd, ncua kev puas tsuaj nyob rau hauv tensile kev nyuaj siab. Cov txheej txheem electroplating ib txwm ua kom muaj hydrogen ntawm lub cathode thaum lub sij hawm hlau deposition, thiab txawm tias tag nrho ci tom qab plating tsis tuaj yeem lav tag nrho cov hydrogen tshem tawm.

Vim tias Dacromet yog txheej txheej uas tsis yog-electrolytic siv tsis muaj kua qaub pretreatment, tsis muaj hydrogen nkag rau hauv lub ntsia liaj qhov rooj thaum lub sijhawm ua tiav. Tom qab kub-kub curing ntxiv kom ntseeg tau tias cov dej seem seem raug tsav tawm. Kev ntsuas kev tsim nyog - suav nrog cov kev tshawb fawb txhawb nqa kev lees paub ntawm Dacromet rau ASTM A490 cov txheej txheem bolts - tau lees paub tias Dacromet coated high-strength bolts khaws lawv lub zog tawg tag nrho txawm tias tom qab lub sij hawm ntev raug rau qhov chaw corrosive. Qhov no hydrogen embrittlement dawb tus yam ntxwv ua rau Dacromet txheej ntawm kev xaiv rau flange tseem ceeb kev sib txuas hauv cov cua turbines, txuas hniav, cov khoom siv siab, thiab daim ntawv thov tsheb chassis.

3.3 Nyias, Uniform Txheej nrog Kev Pabcuam Zoo

Tsis zoo li kub-dip galvanizing, uas tso cov txheej tuab tuab thiab qee zaum tsis sib xws, Dacromet tsim cov txheej txheej nyias nyias uas ua raws li cov duab kos duab ntawm cov ntsia liaj qhov rooj, hauv qab lub taub hau, thiab lub ntsej muag flange. Qhov kev sib koom ua ke no khaws cov kev sib koom tes tsim thiab tso cai rau kev sib raug zoo torque-tension thaum sib dhos. Daim ntawv thov dip-spin ua kom ntseeg tau tias txawm tias nyuaj geometries, qhov chaw so, thiab sab hauv ntawm flange bolts tau txais kev tiv thaiv xeb, tshem tawm qhov tsis muaj zog uas feem ntau cuam tshuam nrog cov txheej txheem electroplated.

3.4 Kub-kub Stability thiab txhua yam Durability

Dacromet txheej tseem nyob ruaj khov ntawm qhov kev pabcuam txuas ntxiv mus txog 300 ° C, deb tshaj qhov kev txwv ntawm cov pa zinc plating (uas pib degrade ib ncig ntawm 100-120 ° C). Qhov kev tiv thaiv cua sov no yog qhov tshwj xeeb tshaj yog rau cov flange bolts siv nyob rau hauv lub cav compartments, lub tshuab tso pa tawm, cov khoom siv hluav taws xob, thiab cov cuab yeej tsim hluav taws xob. Tsis tas li ntawd, cov yeeb yaj kiab Dacromet kho tau pom zoo rau kev puas tsuaj rau cov khoom siv thaum tuav thiab kev teeb tsa, ntxiv rau kev tiv thaiv corrosion mus sij hawm ntev thiab tiv thaiv xeb ntawm lub ntsia liaj qhov rooj.