1) galvanized
Electro-galvanizing yog cov siv ntau txheej rau fasteners coj mus muag. Nws tseem pheej yig, lub zog tseem good-looking, koj yuav muaj dub, tub rog ntsuab. Txawm li cas los, nws los tiv thaiv corrosion zog hauv hais, nws cov corrosion kuj yog zinc (txheej) qis tshaj cov txheej txheej. Nruab nrab ntsev tsuag ntsuam xyuas hais txog tsis pub dhau 72 xuaj moos, tab sis kuj siv tshwj xeeb sealing tus neeg saib xyuas, kev tsis txau ntsev sim rau 200 xuaj moos los sis ntev dua, tiam sis tus nqi kim, yog feem ntau 5 rau sij hawm 8 tus zinc.
Electroplating txheej txheem yog yooj yim mus ua hydrogen embrittlement, kom dhau grade10.9 lub bolts no feem ntau tsis kho nrog galvanized. Txawm tias tus plating yuav siv tau tom qab qhov cub tau hydrogen, tiam sis puas lawm yuav tsum naam passive 60 ℃ los yog ntau tshaj, yog li tus dehydrogenation mustbe processedbefore passivation. Tsis operability, high xyuas txog cov nqi. Kev muaj tiag, cov khw xwb yuav tsis ntev cov teg num rau dehydrogenation, tsuas yog ib tus customerand #39; s Individual raws.
Torque Electro-galvanized fasteners - preload quab yuam li qub tas li yuav txom nyem, thiab tsis ruaj tsis khov, feem ntau tsis siv rau qhov tseem ceeb ntawm txoj kev twb kev txuas. Thiaj li yuav zoo lub torque - preload uniformity, yeej tseem yuav coated nrog lubricating khoom tom qab plating txoj kev txhim kho thiab ua kom lub torque - preload quab yuam li qub tas li.
(2) phosphating
Phosphatingis cheaper thangalvanized, andcorrosion kuj yog heev tshaj. Phosphating yuav tsum tau coated uas muaj roj, nws ua hauj corrosion thiab ntawv muaj ib txoj kev zoo nrog roj. Piv txwv li, tom qab phosphating los tiv thaiv xeb roj coated feem ntau, ntsev tsuag tsis mus kuaj yog tsuas 10 mus rau 20 teev. Coated high-grade xeb los tiv thaiv cov roj, nws tau mus txog 72 96 teev. Tab sis cov nqi yog feem ntau 2 rau 3 timesof tus phosphate txheej roj.
Phosphating fasteners siv muaj ob, zinc-raws li phosphate thiab manganese kuas phosphating. Zinc phosphating lubrication kev kawm yeej zoo zog li manganese phosphate, manganese phosphate incorrosion zoo kuj. Nws yuav siv sov ntawm 225 tus ° F thiab 400 ° F (107 ° C rau 204 ° C).
Muaj fasteners kho muaj phosphating roj. Vim yog lub torque-zawm quab yuam li qub tas li no zoo heev, cov los ua ke yuav tau lees tias tus tsim lub expected zawm after raws, soitand #39; s widelyusedin txoj kev lag luam. Tshwj xeeb tshaj yog ib co tseem ceeb qhov chaw hauv lub qhov zoo sib xws. Xws li, hlau qhov zoo sib xws, tus pas nrig cav connecting bolts, ceev, lub tog raj kheej taub hau, lub ntsiab kabmob, flywheel bolts, log bolts thiab ceev.
Bolts zog siv phosphating kom tsis txhob muaj qhov teeb meem hydrogen embrittlement, luaj teb muaj abovegrade 10.9generally siv ntawm phosphate txheej deg kho.
(3) oxidation (oxide dub)
Dub + roj yog ib nrov heev txheej kom muaj fasteners, vim nws yog tus uas pheej yig tshaj thiab zoo zoo ua ntej cov roj sau. Vim nws twb yuav luag tsis xeb ua hauj lawm, nws yuav xeb sai sai tom qab tsis pub roj. Yog nyob rau hauv cov roj hauv lub xeev, cov ntsev tsuag tsis mus kuaj tau tsuas cuag 3 mus rau 5 moos.
Torque - dub khawm ris lub hwjchim preload li qub tas li tseem txom nyem. Rau khees me ntsis lawm, kuj yog nyob rau hauv cov los ua ke nyob sab hauv xov ntawm cov roj thiab ces screwed.
4) electroplating cadmium
Corrosion kuj ntawm txheej cadmium no zoo heev, tshwj xeeb tshaj yog nyob rau lub atmosphereitand marine #39; s muchbetterthan lwm nto kho. Electroplating cadmium takeshigh costin AUTHORIZED ntawm kua khib nyiab, cov nqi yog hais txog 15 mus rau 20 npaug ntawm lub electro-galvanized. Li ntawd, kev lag luam dav itand #39; s tsuj tsawg siv, rau tej ib cheeb tsam, likeoil drilling platforms thiab fasteners rau HNA aircraft.
5) electroplating chromium
Chromium txheej hauv cov cua no heev ruaj khov, tawv tolose ci, hardness siab thiab hauj goodcorrosion. Chromium plating nyob fasteners yog feem ntau yog siv los ua ib tug hniav nyhuv. Nyob rau tej chaw muaj siab corrosion resistanceitand #39; s kuj siv, vim zoo chrome plating fastenersnearly muaj ib yam kim ofstainless steel, onlywhen stainless hlau zog npaum cas yog tsis txaus, chrome fasteners muab thereplacement.
Yuav kom tsis txhob corrosion, chrome plating yuav tsum tau preceded tooj thiab npib tsib xee. Chromium coatings tau mas txias txij 1,200 ° F (650 ° C). Tiam sis qhov teeb meem asa italsoexisthydrogen embrittlement.
6) nyiaj, npib tsib xee
Nyiaj plating yuav tau ob andsolid corrosion-resistant roj nplua nyeem infasteners. Rau lwm yam nqi, ceev cov nyiaj plated, bolts tsis siv, thiab tej me bolts yog tseem nyiaj dawb plated. Nyiaj loses nws ci hauv tej huab cua, tab sis nws ua haujlwm rau 1600 degree Fahrenheit. Yog li ntawd, cov neeg siv cov kub kub thiab lubrication cov yam ntxwv, rau kev ua haujlwm ntawm kub fasteners, tiv thaiv oxidation txog bolts, nuts tua.
Khawm ris npib tsib xee plated, mas siv ob yam los tiv thaiv corrosion, tabsis tseem muaj ib tug zoo hluav taws xob conductivity ntawm qhov chaw. Xws li tsheb roj teeb terminals thiab hais txog.
7) kub-dipGalvanized
Kub-dipgalvanized muaj dua rau cov kua hauv cov tshav kub diffusion txheej. Txheej thicknessis 15 ~ 100μm, anditand #39; s tswj, yooj yim, tab sis koom hauj corrosive, thiab ntau rau peb tes num. Kub dip zinc xyuas txog kev in the process of kev ua qias tuaj loj, zinc khib thiab zinc vapor.
Raws li tus thickness los txog rau txheej hauv cov fasteners, nws los nrog thiab lwm cov ntsia hlau nyob hauv fittingproblem. Muaj ntau txoj kev workaround ob qhov teeb meem no. Isplating ib firstand ces nruab nrog xov, txawm tias cov screwcan kom daws tau qhov teeb meem ntawm tus ntsia thawv, tab sis italso txo cov corrosion kuj. Lwm oneiswhen tappingthe noob txiv, cov xov hais txog tsi 0.16 ~ 0.75 hli greaterthanstandard (M5 txog M30), thiab ces kub dipgalvanized, txawm tias nws tau daws qhov teeb meem ntawm kev sib hloov, tiam sis them tus nqi kom txhob muaj muaj zog npaum cas. Ntawm nimno, muaj ib tug xov locking - lub teb chaws As Mes Lis Kas, tus sab hauv xov yuav daws tau qhov teeb meem no. Vim muaj nws nrog thiab lwm threads yog tsis nruj thaum tus kis loj, yuav tsum siv kom haum raws li tus thickness ntawm tus txheej, nws tsis muaj feem xyuam rau tus ntsia thawv coupling, hos preserving cov kev kawm thiab ua tau tshua lawm, unaffected.
Vim tus kub-dipgalvanizing ua kub, nws yuav tsis tau siv forfasteners dhau grade10.9.
8) Sherardinzing
Sherardizing yog ib zinc hmoov solid-state thermal metallurgical diffusion txheej. Nws uniformity tsis muaj zoo zoo, xov, qhov muag tsis pom lub qhov yuav tau txais ib yam txheej. Plating thicknessis generallybetween10 ~ 110μm, thiab qhov yuam kev no yuav yog cov controlledless than10%. Nws tsevneeg muaj zog rau lub substrate thiab corrosion kuj nyob zinc txheej (zinc electro-galvanized, kub-dip, dacromet) yog ib qhov zoo tshaj plaws. Txoj kev ua qias tuaj tsis pub, friendly environmentally tshaj.
9) Dacromet
Yog tsis muaj teeb meem hydrogen embrittlement, thiab tus torque - preload quab yuam li qub tas li yuav zoo heev. Yog hais tias koj tsis xav txog tej teeb meem ntawm hexavalent chromium, nws tseem ua tau lub tsim rau corrosion siab yuav tsum muaj lub zog fasteners.
