Qhov kev kho qhov quav ntawm screws, raws li txawv cov kev cai ntawm lawv cov khoom, muaj ntau ntau txoj kev kho mob. Raws li txoj kev kho saum npoo dej yuav muab faib ua ntau, xws li pleev xim, electroplating, electrolessing plating, nqus txheej, immersion plating, anodizing, sandblast hardening, txheej, vapor deposition, carburizing, nitriding, tawv hardening thiab thiaj li. Niaj hnub no, piv rau cov pej xeem, cov kev kho mob li niaj zaus kho raws li nram no:
Electroplating: Ntsuas cov khoom siv electroplating nyob rau hauv ib qho kev sib tov kua dej hauv cov thawv tso rau hauv cov hlau thiab cov hla kev dhau los ntawm lub tshuab da dej electroplating cais thiab sau cov hlau electroplated rau ntawm qhov chaw. Galvanizing, tooj npab, xaws npauj npaim, chromium, copper-nickel alloys, etc. yog feem ntau electroplated, thiab qee zaum dub, phosphatized, thiab lwm yam. Hydrogen embrittlement tau yooj yim tshwm sim thaum lub tshuab electroplating thiab muaj kev cuam tshuam rau ntawm kev ua haujlwm dag zog ntawm haujlwm.
Txhua yam plating: Cov neeg kho tshuab plating yog sib xyaw kom haum, hmoov hmoov, cuam tshuam rau nruab nrab (iav microbeads) thiab ib qho dej ntau hauv lub slurry, thiab muab rau hauv lub nruas ua ke nrog lub workpiece. Nrog cov neeg ua hauj lwm muaj zog ntawm cov menyuam yaus lub cev, cov activator yog nrog cov neeg ua hauj lwm los ntawm qhov nruab nrab (iav microbeads), zinc txheej txheem cov ntaub ntawv nyob rau ntawm cov hlau hauv chaw sov.
Kub-dip galvanizing: Nws tiav rau hauv lub tais plating hauv qhov uas ua kom cov hlau raug raus hauv lub ntsuas kub li ntawm 510 ° C. Raws li qhov tshwm sim, cov hlau zinc hlau ntawm lub npoo ntawm cov hlau maj mam ua ib daim ntawv tso cai zinc rau sab nraud ntawm cov khoom muag. Txawm li cas los xij, vim muaj qhov kub siab thaum lub caij kub-dip plating, cov khoom siv hlau yog cov kub ntxhov siab heev.