Hydrogen embrittlement yog ib qho kev phom sij tseem ceeb rau pob khawm screws. Qhov teeb meem ntawm hydrogen embrittlement yog ntau tshaj tawm nyob rau hauv hydrocarburized ncaj quenched screws tshaj nyob rau hauv carburized qhov chaw. Hydrogen generated thaum pickling thiab electroplating thiab hydrogen nyob rau hauv ib puag ncig nruab nrab thaum carbonitriding (feem ntau yog siab li 60 feem pua -70 feem pua ) tuaj yeem yaj ib feem ntawm cov hlau hauv cov hlau. Thaum cov txheej txheem cathodic tam sim no ntawm cov txheej txheem electroplating thiab phosphating tsis ncav cuag 100 feem pua, ntau cov hydrogen atoms yuav txuas rau saum npoo ntawm cov ntsia hlau, uas ua rau hydrogen permeation. Qhov kev coj cwj pwm ntawm hydrogen no muaj qhov cuam tshuam tseem ceeb rau hydrogen embrittlement kev puas tsuaj ntawm hlau.
Lub pob khawm ntsia hlau tsav lub sij hawm rau hydrogen yog 6-8h, vim tias qhov kub thiab txias tuaj yeem txhim kho qhov diffusion coefficient ntawm hydrogen nyob rau hauv cov hlau, yog li cov cua sov preservation ntawm 20-20 degree yuav tshem tawm hydrogen embrittlement, tab sis qhov kub thiab txias yog heev. siab, xws li saum toj 40 degree, hydrogen yog yaj hauv cov hlau thiab ntxiv, hydrogen yuav tsis cia li khiav tawm ntawm cov hlau, thiab lub hom phiaj ntawm kev tshem tawm hydrogen tsis tuaj yeem ua tiav. Lub hydrogen tsav kub yog xaiv ntawm 140-170 degree (phosphating), 200-240 degree (electroplating), tab sis cov khoom yuav tsum yog raws li cov tub ntxhais hardness, nto roughness, plating lub sij hawm, txheej thickness, pickling lub sij hawm, acid concentration thiab lwm yam kev tsim khoom. Kev txiav txim siab lub sijhawm ntawm hydrogen dej nyab yuav tsum tau ua ua ntej kev kho mob passivation thiab tsuas yog tom qab electroplating (hauv 4 teev).
Kev tshawb fawb ntawm pob khawm screws yog nyob rau theem tseem ceeb, thiab muaj tsawg heev cov kws tshawb fawb thiab thev naus laus zis koom nrog kev tshawb fawb theoretical ntawm cov ntsia hlau me me, tshwj xeeb tshaj yog cov kev tshawb fawb theoretical ntawm pob khawm screws. Txawm li cas los xij, tsis muaj kev tshaj tawm monograph ntawm kev tsim thiab tsim cov screws me me txhua. Qhov no tau tsim muaj kev txwv loj rau kev txhim kho tag nrho cov phiaj xwm qib ntawm cov ntsia hlau me me hauv kuv lub tebchaws. Cov neeg tsim khoom hauv tsev ntawm pob khawm screws pib ua raws li cov qauv thiab kos duab. Txawm hais tias lawv muaj kev paub ntau lawm, lawv tsis tau txheeb xyuas thiab theorized lawv cov kev paub ntau lawm, thiab nyob rau hauv thawj hom kev tsim khoom ntawm tus tswv. Qhov no tau txwv tsis pub ntau lawm qib ntawm pob khawm screws hauv peb lub tebchaws. Muaj qee qhov kev tshawb fawb txog pob khawm screws hauv ntiaj teb. Zoo li cov khoom siv hauv tsev, qhov cuam tshuam tsis zoo ntawm qee cov pob khawm ntsia hlau uas tau siv dav hauv kev lag luam tseem tsis tau raug xaiv los ntawm cov qauv kev lag luam hauv lub tebchaws.