1.Dab tsi yog qhov feem ntau ntawm cov thicknesses (qhia hauv pawg)?
Standard Corrosion Passivation:
Ntau yam: kwv yees li 5 - 30 mg/m² (raws li tag nrho chromium)
Kev hloov pauv: Qhov no sib npaug rau cov txheej nyias nyias, kwv yees li ntawm qhov kev txiav txim ntawm ob peb nanometers rau kaum nanometers. Cov yeeb yaj kiab hauv qhov no muab kev sib cuam tshuam zoo - txheej txheem xeb nrog kev cuam tshuam me me rau cov txheej tom ntej.
High Corrosion Passivation (xws li, rau cov ntawv galvanized, tshwj xeeb tshaj yog thaum tsis muaj roj yuav tsum tau):
Ntau yam: kwv yees li 30 - 100 mg/m² (raws li tag nrho chromium), los yog ntau dua.
Daim Ntawv Thov: Yuav tsum tau siv cov tshuaj ntsev ntsev ntau ntev (piv txwv li, tshaj 72 teev).
Fingerprint Resistant Passivation:
Qhov no suav nrog ntxiv cov txheej txheem organic (anti-tus neeg saib xyuas tus ntiv tes) rau hauv zaj duab xis passivation. Nws cov yeeb yaj kiab thickness feem ntau muaj ob ntu:
Hauv qab chromate conversion zaj duab xis: kwv yees li 10 - 30 mg/m²
Sab saum toj txheej organic zaj duab xis: kwv yees li 0.5 - 2 g/m²
Tag nrho cov yeeb yaj kiab thickness nce ntau, tab sis feem ntau yog tsim los ntawm cov khoom siv organic.
2.Dab tsi yog qhov txawv ntawm "muaj chromium" thiab "tag nrho chromium"?
Kev tiv thaiv corrosion ntawm ib zaj duab xis passivation feem ntau yog nyob ntawm cov ntsiab lus ntawm hexavalent chromium (Cr6+) hauv txheej zaj duab xis, uas muaj peev xwm "tus kheej- kho" zoo heev.
Cov ntsiab lus feem ntau ntsuas hauv kev sim yog tag nrho cov ntsiab lus chromium (xws li trivalent chromium Cr3+ thiab hexavalent chromium Cr6+). Trivalent chromium tsim lub moj khaum, thaum hexavalent chromium muab kev tiv thaiv corrosion. Qhov piv ntawm ob lub ntsiab lus no yog qhov tseem ceeb rau kev ua haujlwm.
3.Dab tsi yog txoj kev ntsuas?
X-ray fluorescence spectrometry: Feem ntau siv, tsis yog-kev puas tsuaj, thiab ceev hauv online los yog txoj kev kuaj. Nws ncaj qha ntsuas cov ntsiab lus chromium ib cheeb tsam (mg / m²).
Tshuaj titration: Ib txoj kev kuaj ib txwm muaj, ntau cumbersome, tab sis yields raug.
Electrolyte thickness gauge: tuaj yeem siv los ntsuas qhov tsis yog -cov yeeb yaj kiab ntawm cov khoom siv hluav taws xob, tab sis feem ntau siv los ntsuas cov phosphating films lossis cov coatings tuab dua.
4.Dab tsi txheej txheem cuam tshuam rau zaj duab xis thickness?
Passivation kua concentration: Cov concentration siab dua ua rau muaj kev ua yeeb yaj kiab sai thiab tuab dua.
Kev kub ceev: Ua kom kub ceev ceev cov tshuaj tiv thaiv thiab ua kom cov yeeb yaj kiab tuab.
Lub sijhawm ua haujlwm (txheej ceev): Lub sijhawm nyob ntev dua hauv lub tank passivation ua rau cov yeeb yaj kiab tuab.
Txoj kev Passivation: Roll txheej feem ntau yields ib tug ntau uniform thiab controllable zaj duab xis thickness tshaj tshuaj tsuag txheej.
Kev ziab kom qhuav: Kev ziab tsis txaus ua rau cov txheej txheej zaj duab xis tsis tiav; dhau - ziab tuaj yeem ua rau hexavalent chromium txo qis.
5.Dab tsi yog qhov txawv ntawm ib puag ncig tus phooj ywg chromium-dawb passivation?
Nrog rau kev tiv thaiv ib puag ncig nruj zuj zus, chromium- tsis pub dhau passivation (siv zirconium ntsev, titanium ntsev, silanes, organic resins, thiab lwm yam) yog siv ntau thiab ntau zaus.
Lub tswvyim ntawm "thickness" rau chromium-dawb passivation films txawv ntawm cov chromates. Nws feem ntau yog qhia raws li cov txheej txheem ib cheeb tsam (g / m² lossis mg / m²). Txawm hais tias nws cov lej ntau yuav zoo ib yam li cov chromates, nws cov txheej txheem tiv thaiv corrosion yog qhov sib txawv kiag li (feem ntau yog qhov cuam tshuam rau lub cev, tsis muaj tus kheej - kho muaj peev xwm).