1.Dab tsi yog peb yam xwm txheej uas feem ntau yuav tsum tau ua npuas dej rau daim ntawv?
Cov txheej txheej yog qhov tsis zoo lossis nws qhov adhesion tau txo qis (raws li feem ntau tshwm sim tom qab oxidative aging).
Muaj cov dej noo los yog corrosive hauv qab txheej.
Kev tsav tsheb sab nraud (xws li kev hloov pauv kub, siab osmotic).
2.Dab tsi yog cov txheej txheem thiab ua rau osmotic foaming?
Cov txheej txheem: Cov dej noo (dej nag, condensation) nkag mus rau hauv cov txheej txheem los ntawm cov npoo, txiav, thiab kev puas tsuaj me me, mus txog qhov chaw nruab nrab ntawm txheej txheej thiab substrate. Yog hais tias lub txheej tau ua tsawg ntom vim oxidation thiab aging, noo noo nkag tau yooj yim dua.
Ua rau blistering: Dej tsim cov electrolyte ntawm cov hlau phaj (anode) thiab zinc txheej (cathode), pib corrosion. Corrosion khoom (xeb, zinc ntsev) nthuav nyob rau hauv ntim, tsim osmotic siab uas lifts cov laus, nkig, thiab tsawg nplaum txheej, tsim hlwv.
Kev sib raug zoo nrog oxidation: Oxidized (hnub nyoog) coatings muaj adhesion tsis zoo thiab yog yooj yim tev tawm, yooj yim blistering.
3.Dab tsi yog cov txheej txheem thiab ua rau blistering thaum lub sij hawm cathode stripping?
Txheej txheem: Thaum lub substrate (tshwj xeeb tshaj yog nyob rau hauv qhov chaw txiav los yog puas tsuaj) pib corrode, ib tug electrochemical corrosion cell ntaub ntawv. Thaum lub sij hawm cov tshuaj tiv thaiv corrosion, alkaline tshuaj (OH⁻) yog tsim nyob rau hauv lub cathode cheeb tsam (qhov tsis zoo zinc plating).
Ua rau blistering: Cov tshuaj alkaline no rhuav tshem cov tshuaj sib txuas ntawm cov txheej txheem thiab cov txheej txheem substrate (saponification cov tshuaj tiv thaiv), ua rau cov txheej txheem tev tawm ntawm lub substrate. Kev laus (oxidation) ntawm txheej nws tus kheej ntxiv txo nws cov alkali tsis kam, ua kom cov txheej txheem no nrawm dua.
4.Qhov tsis xws luag hauv cov txheej txheem nws tus kheej lossis daim ntawv thov tsis raug ua rau blistering?
Txheej txheem: Thaum lub sij hawm tsim khoom, huab cua npuas thiab impurities nyob rau hauv lub txheej, los yog tsis txaus pretreatment ntawm lub substrate (roj, hmoov av), yuav ua rau inherently tsis muaj zog adhesion nyob rau hauv tej qhov chaw.
Ua rau blistering: Hauv kev siv sab nraum zoov, qhov kub hloov pauv ua rau huab cua lossis cov dej noo ntawm cov ntsiab lus tsis muaj zog kom nthuav dav, ncaj qha nqa cov txheej. Hauv qhov no, blistering yuav tshwm sim txawm tias cov txheej txheem tseem tsis tau pom oxidation tseem ceeb.
5.Dab tsi yog txheej oxidation/aging?
Nyob rau hauv lub sij hawm ntev - cuam tshuam ntawm ultraviolet hluav taws xob, tshav kub, ya raws, thiab tshuaj, cov resin nyob rau hauv lub txheej degrades, manifesting li:
Poob ntawm gloss thiab fading
Powder (txheej txheej nto ua hmoov)
Ua brittle thiab poob elasticity