Dab tsi yog cov ntaub ntawv corrosion ntawm titanium rods?

1. Crevice corrosion:Crevice corrosion yog qhov tshwm sim corrosion hauv zos uas tshwm sim nyob rau hauv qhov sib txawv. Qhov khoob tuaj yeem tshwm sim los ntawm cov qauv (xws li flange txuas qhov chaw lossis qhov chaw gasket, txuas txuas ntawm cov kav dej thiab cov ntawv raj, thiab bolts lossis rivets). sib koom ua ke, thiab lwm yam), kuj tuaj yeem tshwm sim los ntawm nplai lossis cov av hauv qab npog. Nyob rau hauv thaum ntxov hnub, nws tau ntseeg tias titanium yuav tsis raug crevice corrosion nyob rau hauv dej hiav txwv thiab ntsev tsuag. Tom qab ntawd, nyob rau hauv high-temperature chloride media (xws li seawater heat exchangers), ntub chlorine gas (xws li ntub chlorine gas tube condensers), oxidant-inhibited hydrochloric acid daws, hauv xov xwm xws li formic acid thiab oxalic acid daws, crevice corrosion puas. ntawm cov cuab yeej siv tau tshwm sim ib qho tom qab lwm qhov.
Lub crevice corrosion ntawm titanium rods muaj feem xyuam rau ntau yam xws li ambient kub, chloride hom thiab concentration, pH tus nqi, thiab qhov loj thiab geometry ntawm qhov crevice. Tsis tas li ntawd, qhov khoob ntawm titanium thiab polytetrafluoroethylene, titanium thiab asbestos thiab lwm yam ntaub ntawv uas tsis yog xim hlau yog rhiab heev rau crevice corrosion tshaj qhov khoob ntawm titanium thiab titanium.
2. Pointing corrosion:Pointing corrosion yog ib daim ntawv ntawm corrosion tshwj xeeb rau passivated hlau. Piv nrog stainless hlau lossis aluminium alloy, pitting corrosion kuj ntawm titanium zoo heev. Vim tias kev siv titanium nce ntxiv hauv cov kev daws teeb meem kub kub hauv cov tshuaj chloride, pitting corrosion hauv cov khoom siv titanium tau maj mam nce.
Piv txwv ntawm pitting corrosion puas tau tshwm sim hauv titanium anode pob tawb hauv electrolytic zinc, titanium coil rhuab hauv zinc chloride tov, thiab titanium pob valve hauv 175 degree 72% calcium chloride tov. Feem ntau hais lus, pitting corrosion ntawm titanium yog qhov nyuaj tshaj li crevice corrosion. Crevice corrosion feem ntau tshwm sim nyob rau hauv daim ntawv ntawm pitting corrosion ntawm lub crevice nto.
3. Galvanic corrosion:Galvanic corrosion yog ib qho tshwm sim uas cov hlau sib txawv tuaj rau hauv kev sib cuag (xws li hluav taws xob tiv tauj) hauv cov tshuaj electrolyte. Vim tias qhov sib txawv ntawm qhov muaj peev xwm nyob ruaj khov ntawm cov hlau, ib lub hlau ua kom lub zog ntawm lwm cov hlau (piv txwv li, anodic dissolution). Titanium oxide zaj duab xis ntawm titanium yog ruaj khov heev thiab feem ntau yog nyob rau hauv lub xeev cathodic. Galvanic corrosion yuav tsis ceev lub anodic dissolution ntawm titanium.
Txawm li cas los xij, kev saib xyuas yuav tsum tau them rau hydrogen absorption ntawm titanium hauv lub xeev cathode, uas yuav ua rau hydrogen embrittlement. Nyob rau tib lub sijhawm, nws yog ib qho tsim nyog los tiv thaiv qhov nrawm nrawm ntawm cov hlau sib txuas (xws li txhuas, tooj liab, zinc, thiab lwm yam). Qhov loj ntawm galvanic corrosion ntawm hlau nyob ntawm qhov sib txawv ntawm galvanic ib ntus ntawm cov hlau txuas hauv nruab nrab.