Khetho ea phekolo ea holim'a metsi ke bothata boo moqapi e mong le e mong a tobaneng le bona. Ho na le mefuta e mengata ea mekhoa ea phekolo ea holim'a metsi e fumanehang, 'me moqapi oa boemo bo phahameng ha aa lokela ho nahana feela ka moruo le ts'ebetso ea moralo, empa hape a ele hloko mokhoa oa kopano esita le litlhoko tsa tikoloho. Ka tlase ke kenyelletso e khuts'oane ea litlolo tse sebelisoang hangata bakeng sa li-fasteners tse ipapisitseng le melao-motheo e kaholimo, bakeng sa litšupiso tsa lingaka tsa li-fasteners.
1. Electrogalvanizing
Zinc ke seaparo se sebelisoang haholo bakeng sa li-fasteners tsa khoebo. Theko e batla e le theko e tlaase, 'me ponahalo e ntle. Mebala e tloaelehileng e kenyelletsa botala bo botšo le sesole. Leha ho le joalo, ts'ebetso ea eona ea anti-corrosion ke karolelano, 'me ts'ebetso ea eona e thibelang ho bola ke e tlase ka ho fetisisa har'a li-layer tsa zinc plating (coating). Ka kakaretso, tlhahlobo ea sefafatsi sa letsoai e sa nke lehlakore ea tšepe e entsoeng ka masenke e etsoa nakong ea lihora tse 72, 'me lisebelisoa tse khethehileng tsa ho tiisa li boetse li sebelisoa ho netefatsa hore tlhahlobo ea spray ea letsoai e sa nke lehlakore e nka lihora tse fetang 200. Leha ho le joalo, theko e theko e boima, e leng makhetlo a 5-8 a tšepe e tloaelehileng ea galvanized.
Ts'ebetso ea electrogalvanizing e na le tšekamelo ea ho hlahisa hydrogen, kahoo liboutu tse ka holimo ho grade 10.9 hangata ha li phekoloe ka galvanizing. Le hoja haedrojene e ka ntšoa ka ontong ka mor'a ho roala, filimi ea passivation e tla senyeha mocheso o ka holimo ho 60 ℃, kahoo ho tlosoa ha haedrojene ho tlameha ho etsoa ka mor'a electroplating le pele ho feta passivation. Sena se na le ts'ebetso e fokolang le litšenyehelo tse phahameng tsa ho sebetsa. Ha e le hantle, limela tsa tlhahiso ea kakaretso ha li tlose haedrojene ka mafolofolo ntle le haeba li laetsoe ke bareki ba itseng.
Ho tsitsana lipakeng tsa torque le matla a ho tiisa pele a li-fasteners ho fokola ebile ha hoa tsitsa, 'me ka kakaretso ha e sebelisoe ho hokahanya likarolo tsa bohlokoa. Bakeng sa ho ntlafatsa ho ts'oana ha torque preload, mokhoa oa ho roala lintho tse tlotsang ka mor'a ho roala o ka sebelisoa ho ntlafatsa le ho matlafatsa botsitso ba torque preload.
2. Phosphating
Molao-motheo oa mantlha ke hore phosphating e batla e le theko e tlase ho feta galvanizing, empa khanyetso ea eona ea kutu e mpe ho feta galvanizing. Ka mor'a phosphating, oli e lokela ho sebelisoa, 'me khanyetso ea eona ea kutu e amana haufi-ufi le ts'ebetso ea oli e sebelisoang. Ka mohlala, ka mor'a phosphating, sebelisa oli e tloaelehileng ea anti rust le ho etsa tlhahlobo ea ho se nke lehlakore ka letsoai bakeng sa lihora tse 10-20 feela. Ho sebelisa oli ea boemo bo holimo ea anti rust ho ka nka lihora tse 72-96. Empa theko ea eona ke makhetlo a 2-3 ea oli e akaretsang ea phosphating.
Ho na le mefuta e 'meli e sebelisoang hangata ea phosphating bakeng sa li-fasteners, zinki e thehiloeng phosphating le manganese e thehiloeng phosphating. Zinc e thehiloeng phosphating e na le ts'ebetso e betere ea lubrication ho feta phosphating e thehiloeng ho manganese, 'me phosphating e thehiloeng ho manganese e na le khanyetso e ntle ea kutu le ho hanyetsa ho roala ho feta plating ea zinki. E ka sebelisoa ka mocheso ho tloha 225 ho isa ho 400 degrees Fahrenheit (107-204 ℃). Haholo-holo bakeng sa ho hokahanya ha likarolo tse ling tsa bohlokoa. Joalo ka ho kopanya liboutu tsa molamu le linate tsa enjene, hlooho ea silindara, thepa e ka sehloohong, liboutu tsa flywheel, liboutu tsa mabili le linate, jj.
Liboutu tse matla tse phahameng li sebelisa phosphating, e ka boelang ea qoba mathata a hydrogen embrittlement. Ka hona, liboutu tse kaholimo ho grade 10.9 tšimong ea indasteri hangata li sebelisa kalafo ea holim'a phosphating.
3. Oxidation (e fifala)
Blackening+oiling ke seaparo se tsebahalang sa li-fasteners tsa indasteri hobane se theko e tlase ebile se shebahala se le ntle pele ho sebelisoa mafura. Ka lebaka la ho fifala ha eona, e batla e se na matla a ho thibela mafome, kahoo e tla rusa kapele ntle le oli. Esita le ka pel'a oli, tlhahlobo ea spray ea letsoai e ka nka lihora tse 3-5 feela.
4. Karohano ea Electroplating
Cadmium plating e na le khanyetso e ntle ea kutu, haholo tikolohong ea sepakapaka sa leoatle, ha e bapisoa le liphekolo tse ling tse holim'a metsi. Litšenyehelo tsa phekolo ea metsi a litšila nakong ea electroplating cadmium li phahame, 'me theko ea eona e ka bang makhetlo a 15-20 ea zinki ea electroplating. Kahoo ha e sebelisoe liindastering tse akaretsang, feela bakeng sa tikoloho e itseng. Li-fasteners tse sebelisetsoang li-platform tsa ho cheka oli le lifofane tsa HNA.
5. Chromium plating
Seaparo sa chromium se tsitsitse haholo sepakapakeng, ha ho bonolo ho fetola 'mala le ho lahleheloa ke khanya,' me se na le boima bo phahameng le ho hanyetsa ho apara hantle. Tšebeliso ea chromium plating holim'a li-fasteners hangata e sebelisetsoa merero ea ho khabisa. Ha e sebelisoe hangata masimong a liindasteri a nang le litlhoko tse phahameng tsa ho hanyetsa kutu, kaha li-fasteners tse ntle tsa chrome plated li bitsa chelete e ngata joalo ka tšepe e sa hloekang. Ke feela ha matla a tšepe a sa lekaneng, ho sebelisoa li-fasteners tse nang le chrome.
E le ho thibela kutu, koporo le nickel li lokela ho kenngoa pele pele li kenngoa ka chrome. Thepa ea chromium e ka mamella mocheso o phahameng oa likhato tse 1200 tsa Fahrenheit (650 ℃). Empa ho boetse ho na le bothata ba hydrogen embrittlement, e tšoanang le electrogalvanizing.
6. Nickel plating
Haholo-holo e sebelisoa libakeng tse hlokang ka bobeli anti-corrosion le conductivity e ntle. Mohlala, liteishene tse tsoang tsa libeteri tsa koloi.
7. Chelete e chesang e chesang
Hot dip galvanizing ke seaparo se futhumatsang sa zinki se futhumetseng ho fihlela mokelikeli. Botenya ba ho roala bo pakeng tsa 15 le 100 μ m. 'Me ha ho bonolo ho laola, empa e na le khanyetso e ntle ea kutu 'me e atisa ho sebelisoa boenjiniere. Nakong ea ts'ebetso ea ho kenya letsoho ka har'a metsi a chesang, ho ba le tšilafalo e matla, ho kenyelletsa le litšila tsa zinki le mouoane oa zinki.
Ka lebaka la ho roala ho teteaneng, ho bakile mathata a ho senya likhoele tsa ka hare le tsa ka ntle ho li-fasteners. Ka lebaka la mocheso oa ts'ebetso ea hot-dip galvanizing, e ke ke ea sebelisoa bakeng sa li-fasteners tse ka holimo ho grade 10.9 (340 ~ 500 ℃).
8. Ho kenngoa ha zinki
Ho kenella ka zinki ke seaparo se tiileng sa metallurgical thermal diffusion ea phofo ea zinki. Ho tšoana ha eona ho molemo, 'me lesela le ts'oanang le ka fumanoa ka likhoele le likoti tse foufetseng. Plating botenya ke 10-110 μ m. 'Me phoso e ka laoloa ho 10%. Matla a eona a tlamahano le ts'ebetso ea anti-corrosion le substrate ke tsona tse ntle ka ho fetisisa tsa li-zinc (tse kang electrogalvanizing, hot-dip galvanizing, le Dacromet). Ts'ebetso ea eona ha e na tšilafalo ebile e na le botsoalle ka ho fetisisa tikolohong.
9. Dacromet
Ha ho na bothata ba hydrogen embrittlement, mme ts'ebetso ea torque preload consistency e ntle haholo. Ntle le ho nahana ka litaba tsa chromium le tikoloho, Dacromet ha e le hantle ke eona e loketseng ka ho fetisisa bakeng sa li-fasteners tse matla tse nang le litlhoko tse phahameng tse khahlanong le kutu.
Nako ea poso: May-19-2023
