1) galvanized
electro-galvanizing rav commonly lo' coating commercial fasteners. qutlh, Hoch je good-looking, SuD qIj, QI' laH Daghaj. 'ach anti-corrosion bang qaStaHvIS peQ, corrosion resistance (wep) lowest patlh wep zinc. neutral salt spray waH je Sa' 'emvo' 72 repmey 'ach je le' ngaQ Duy, neutral salt spray 200 rep neH, pagh waH chenmoH lo' 'ach wagh, vaj generally 5 8 poH zinc 'ay'.
mIw electroplating galvanized ngeD embrittlement bIQSIp, lIng vaj beyond grade10.9 generally wej treated bolts je. naH jajmeymaj laH lo' plating qaSpu'DI' bIQSIp oven 'ach Qaw' passive mIllogh qonwI' qoSta' DeSDu' 60 ℃ latlh joq, vaj dehydrogenation mustbe processedbefore passivation. vIvup operability, qach'a' costs mIw. qaStaHvIS reality, initiative dehydrogenation, wej tlhap manufacturer Sa' ghaH'e' SoHbe'chugh specific customerand vIlopQo' jay' 39 tI s mandatory requirements.
torque electro-galvanized fasteners-consistency preload raD vIvup 'ej unstable, generally not lo' potlh 'ay' connection. in order to torque-preload uniformity, Dub laH je wep je Hap 'u' lubricating qaSpu'DI' method Dub 'ej torque-consistency preload raD Dub jengva'.
2) phosphating
phosphatingis cheaper thangalvanized, andcorrosion resistance Qugh, 'ach. vaj wep phosphating je oil, Dun relationship oil chaq resistance corrosion yIqaw je. example qaSpu'DI' phosphating anti-ragh oil je Sa' wep, neutral salt spray waH neH 10 20 rep. wep high-grade anti-ragh oil, 72 96 rep laH SIch 'oH 72 to 96 hours. 'ay' 'ach generally 2 3 timesof phosphate coating oil.
phosphating fasteners commonly lo' cha', zinc-waw' phosphate manganese-waw' phosphating je. zinc phosphating lubrication yIqaw Dunmo' puS manganese phosphate, manganese phosphate resistance incorrosion Dunmo'. laH ngat DeSDu' Hat DuqIppu'chugh 225 ° f 400 ° f (107 ° [taH 204 ° [taH).
treated industrial fasteners je phosphating oils. because of torque-QeymoH raD consistency majQa', chut lulajpu'bogh pIH QeymoH chav laH guarantee yej requirements, soitand vIlopQo' jay' 39 tI s widelyusedin industry. especially 'op potlh 'ay' connection. QaQDaq, connection yoDSutlIj naQ, naHlet, cylinder nach, 'elbogh bearing, flywheel bolts, rutlh bolts je naHlet bolts, QuQ connecting rod.
phosphating DanoHmeH jenwI'-HoS bolts bIQSIp embrittlement qay' webqu'meH nov, vaj pa' industrial yotlh abovegrade 10.9generally lo' ghor treatment wep phosphate.
3) oxidation (qIj oxide)
qIj oil + SuvwI' SoHvaD Qat wep industrial fasteners SeH cheapest je legh QaQ ngejtaH qet oil. qaSchoH tlhoS pagh ragh resistance ghajbe'mo', 'etlh QorghHa'lu'chugh ragh 'oH nom qaSpu'DI' oil-tlhab. oil Sep, neutral salt spray waH laH neH pu'maj 3 5 rep.
torque blacken fastener-preload raD consistency je vIvup. Dub, laH rIp legh internal Surgh oil neH 'ej vaj screwed.
4) cadmium electroplating
corrosion resistance cadmium coating majQa' especially neH marine atmosphereitand 39 vIlopQo' jay'; s muchbetterthan latlh treatment ghor. cadmium takeshigh waste tIn mInDu'Daj 'ej boch processing costin electroplating, 'ay' umqu' ghot 15 20 poH electro-galvanized. vaj pa' Sa' industry itand 39 vIlopQo' jay'; likeoil platforms fasteners hna aircraft 'ej qeq pIjHa' yIlo', neH specific environment, s.
5) chromium electroplating
chromium coating muD neH SoHvaD ngaDmoH, let tolose luster, jen hardness 'ej goodcorrosion resistance. generally lo' chromium plating fasteners je decorative 'angbogh Da. qaStaHvIS industrial mIchHom jen corrosion resistanceitand 39 vIlopQo' jay'; rarely lo' s, mo' rap yoDSutlIj naQ, onlywhen stainless yoDSutlIj naQ HoS cost ofstainless wej yap, fasteners SuD thereplacement chrome ghIq QaQ chrome plating fastenersnearly.
in order to corrosion bot, vaj nung chrome plating copper nickel je. Hat je jen law' 1,200 ° f (650 ° [taH) laH withstand chromium coatings. 'ach italsoexisthydrogen embrittlement asa qay'.
6) silver, nickel
silver plating laH cha' tlhIH corrosion-resistant andsolid lubricant infasteners. tlhInganpu' meq cost, naHlet silver jengva', wej lo' bolts 'ej rut mach bolts je jengva' silver. choptaHvIS jejlaw' luster luj silver 'ach Qapbej DeSDu' fahrenheit qechmeyDaj Huj 1600. vaj, jen Hat lubrication 'ej characteristics, lo' nuvpu' Qap DeSDu' jen Hat fasteners, HoH bolts, oxidation bot nuts.
fastener nickel jengva', rewbe'mey'e' lo' batlhchaj anti-corrosion 'ach je QaQ electrical conductivity Daq. such as vehicle 'ul 'aplo'mey terminals 'ej ngaj.
7) tuj-dipgalvanized
tuj tuj-dipgalvanized tIn mInDu'Daj 'ej boch bopummeH tuj diffusion coating. coating thicknessis 15 ~ 100μm, anditand 39 vIlopQo' jay'; 'ach chu' s QatlhwI' SeH, tlhoS reH corrosive resistance 'ej vI'Iprup jInmol. tuj ngoSmo' zinc mIw in the process of Sagh pollution, zinc waste 'ej zinc vapor.
law' thickness qaStaHvIS fasteners coating, internal 'ej external screw luH 'oH neH fittingproblem. tu'lu' cha' mIw workaround qay'. Surgh internal vaj HIvmeH firstand isplating wa' naH jajmeymaj qay' screw solve screwcan, 'ach corrosion resistance reduced italso. latlh oneiswhen tappingthe naHlet, Surgh vIHtaHbogh 0.16 ~ 0.75 mm greaterthanstandard (m5 ~ m30), 'ej vaj dipgalvanized, tuj naH jajmeymaj laH rotation qay' solve 'ach cost HoS reducing yIDIl 'oH. DeSDu' SaH, ngaQ Surgh-united 'amerI'qa', qay' laH solve Surgh internal. because of internal rur 'ej external wej QeymoH Surgh HeghDI' vI'elta'bogh, vaj laH gap DanoHmeH coating thickness ma', screw coupling, poStaHvIS yIqaw choq not Sov wIHutlh 'oH 'ej HoS ratlh intact, unaffected.
muHIvtaHbogh Hat tuj-dipgalvanizing processing, laH wej lo' forfasteners beyond grade10.9.
8) sherardinzing
sherardizing zinc 'och tIq solid-state metallurgical thermal diffusion coating. uniformity QaQ, Surgh, patlh HIp laH Suq blind qung. jengva' thicknessis generallybetween10 ~ 110μm je Qagh laH controlledless than10 vatlhvI'. bonding HoS substrate corrosion 'ej resistance qaStaHvIS zinc wep (electro-galvanized 'eb, So'meH tuj-ngoSmo' zinc, dacromet) neHqu'. pollution-tlhab, mIw 'ach environmentally friendly.
9) dacromet
bIQSIp embrittlement qay'be' je torque-consistency preload raD majQa'. vaj environmental qay' hexavalent chromium wej qel SoH, mojpu' 'ach yuQmeyDaq jen corrosion requirements jenwI'-HoS fasteners.
