Nyob rau hauv tus txheej txheem ntawm galvanizing hlau qhov chaw, ntxiv rau cov electrodeposition ntawm zinc, muaj feem ntau sab kev cuam tshuam ntawm hydrogen ion txo thiab hydrogen evolution.
Tom qab hydrogen txo qis, ib feem ntawm nws dhau los ua roj thiab khiav tawm, thiab ib feem ntawm nws nkag mus rau hauv lub lattice ntawm txheej thiab matrix hlau nyob rau hauv daim ntawv ntawm hydrogen atoms, ua rau lattice distortion, ua rau muaj kev ntxhov siab ntawm qhov chaw, thiab embrittlement ntawm txheej thiab matrix. , uas yog hu ua hydrogen embrittlement.
Hydrogen embrittlement ua rau muaj kev puas tsuaj loj rau cov khoom siv ntawm cov khoom siv. Yog tias nws tsis raug tshem tawm, nws yuav cuam tshuam rau kev pabcuam lub neej ntawm cov khoom thiab txawm tias ua rau muaj kev puas tsuaj ntawm cov tshuab. Yog li ntawd, qee cov hlau lossis cov khoom siv nyob rau hauv cov xwm txheej tshwj xeeb yuav tsum tau txais kev kho dehydrogenation. Piv txwv li, galvanized qhov chaw siv hauv dav hlau yuav tsum tau kho dehydrogenation. Kev tshem tawm hydrogen kuj tseem yuav tsum tau ua rau galvanizing ntawm qhov chaw elastic thiab cov hlau muaj zog.
Kev tshem tawm hydrogen txais kev kho cua sov kom tsav cov hydrogen tawm ntawm qhov chaw. Cov nyhuv dehydrogenation yog cuam tshuam nrog lub dehydrogenation kub thiab tuav lub sijhawm. Qhov kub siab dua, qhov ntau dua qhov dehydrogenation yuav yog. Txawm li cas los xij, qhov cua sov yuav tsum tsis txhob siab dhau. Yog tias nws siab tshaj 250 degree, lub crystalline qauv ntawm zinc yog deformed thiab nkig, thiab corrosion kuj yog txo. Feem ntau, L90 degree ~ 230 degree, 2h ~ 3h. Kev tshem tawm hydrogen kub ntawm carburized qhov chaw thiab tin weldments yog 140 degree ~ l60 degree, thiab kev txuag hluav taws xob yog 3H.
Nyob rau hauv ib qho kev daws teeb meem electroplating, vim yog kev sib cais ntawm cov dej molecules, muaj ib txwm muaj qee tus lej ntawm hydrogen ions ntau dua lossis tsawg dua. Yog li ntawd, nyob rau hauv cov txheej txheem ntawm electroplating, nag lossis daus ntawm hlau ntawm cathode (cov tshuaj tiv thaiv tseem ceeb) yog nrog los ntawm nag lossis daus ntawm hydrogen (sab cov tshuaj tiv thaiv).
Kev cuam tshuam ntawm hydrogen evolution yog multifaceted, qhov tseem ceeb tshaj plaws yog hydrogen embrittlement. Hydrogen embrittlement yog ib qho kev phom sij loj tshaj plaws hauv kev kho saum npoo. Cov khoom uas muaj hydrogen evolution loj tuaj yeem tawg thaum siv, ua rau muaj xwm txheej loj. Cov kws kho mob saum npoo yuav tsum paub cov thev naus laus zis kom zam thiab tshem tawm hydrogen embrittlement, thiaj li txo qhov cuam tshuam ntawm hydrogen embrittlement.
