Kev tshem tawm hydrogen los ntawm electroplating ntawm hluav taws xob cua sov raj yog qhov tseem ceeb tshwj xeeb rau cov khoom siv electroplating

Kev tshem tawm hydrogen los ntawm electroplating ntawm hluav taws xob cua sov raj yog qhov tseem ceeb tshwj xeeb rau cov khoom siv electroplating

Kev tshem tawm hydrogen yog qhov tseem ceeb tshwj xeeb rau cov khoom siv electroplating, xws li hauv cov txheej txheem electroplating, cov hlau ions raug plated tau txais electrons ntawm cathode, thiab hydrogen ions kuj tau txais electrons, tsim cov atomic hydrogen uas nkag mus rau hauv cov hlau txheej, ua rau cov txheej txheem xoob. Tom qab tso tseg tsis siv rau ib lub sijhawm, atomic hydrogen yuav ua ke los tsim cov hydrogen thiab nthuav dav hauv ntim, ua rau muaj qhov tsis xws luag xws li pinholes, npuas, thiab txawm tias detachment ntawm txheej, Yog tias nws nkag mus rau hauv lub substrate, nws kuj tuaj yeem ua rau. hydrogen embrittlement ntawm tag nrho cov tivthaiv, tshwj xeeb tshaj yog rau high-zog steel. Thaum hydrogen nkag mus, nws tuaj yeem yooj yim ua rau nkig tawg ntawm cov khoom. Yog li ntawd, tom qab electroplating, nws yog ib qho tsim nyog yuav tsum tau ua kom sov kho ntawm qhov kub thiab txias rau ob peb teev kom tshem tawm cov hydrogen uas nkag mus rau hauv qab txheej lossis rau hauv cov hlau puag.

Piv nrog rau kev kho mob passivation, txoj kev tshem tawm hydrogen yog qhov yooj yim thiab yooj yim. Feem ntau, kev kho cua sov yog siv los tshem tawm atomic hydrogen. Rau cov khoom siv galvanized feem ntau, lawv feem ntau khaws cia rau hauv qhov cub nrog lub kiv cua ntawm qhov kub thiab txias ntawm 220 degree rau 2 teev. Cov txheej txheem no feem ntau yog ua ntej passivation, thiaj li tsis ua rau cov txheej txheem passivation tawg vim hydrogen hloov chaw [3]. Tom qab cov tshuaj npib tsib xee plating ntawm cov hlau tsis muaj steel, kev kho cua sov ntawm 400 degree rau 1.5 teev tuaj yeem txhim kho nws cov tawv tawv thiab txo cov brittleness [4]. Tom qab kev tshem tawm hydrogen ntawm 100 degree , 150 degree , 200 degree , thiab 1.5 teev, tensile bonding zog ntawm Fe Mn alloy coatings nce 49.5 feem pua ​​, 75.5 feem pua ​​, thiab 121.8 feem pua ​​, feem [5]. Nws tuaj yeem pom tias kev kho mob tshem tawm hydrogen plays lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua haujlwm ntawm txheej txheej.

Raws li tuaj yeem pom los ntawm cov saum toj no, kev kho dehydrogenation feem ntau yog xaiv qhov ntsuas kub zoo (feem ntau ntawm 200 thiab 300 degree) thiab sijhawm (feem ntau yog 2-3 teev) rau kev kho cua sov. Txawm li cas los xij, muaj qhov sib txawv me ntsis rau cov txheej txheem sib txawv, thiab qhov sib txawv ntawm kev kho kub thiab lub sijhawm kuj muaj qee yam cuam tshuam rau kev ua haujlwm ntawm cov txheej txheem. Yog li ntawd, kev tshem tawm hydrogen yuav tsum xyuas kom meej tias cov atomic hydrogen nkag mus rau hauv cov txheej txheem los yog hlau substrate tuaj yeem raug tshem tawm tau zoo yam tsis ua rau cov txheej txheem tawg.

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