Vim Li Cas Cov Khoom Rusting Hauv Ntsev Tsuag Tom Qab PVD Coated?

Feem ntau muaj qhov nyob rau hauv lub substrate thiab muaj impurities nyob rau hauv qhov, tom qab kho PVD, txheej coating muaj qhov tsis xws luag, xws li micro tawg, qhov, pinholes, xoob thaj, thiab lwm yam vim yog qhov teeb meem ntawm cov substrates.

Hauv kev ntsuam xyuas cov ntsev, tshuaj siv dej tawm hauv dej rau hauv substrate los ntawm cov teeb meem no, yog li txheej txheej, cov xov tooj ntawm cov hluav taws xob thiab cov khoom siv lo rau cov roj teeb uas muaj qhov sib txuas nrog cov xov xwm. Cov txheej txheem thiab cov substrate ua haujlwm li cov electrode ntawm lub roj teeb, vim cov txheej kuj muaj feem ntau cov tshuaj tsis muaj zog thiab electrode siab, cov hlau substrate thiab cov kav hlau tsis muaj qis dua li sib txig sib xws li lub tshuab hluav taws xob qis dua.

Rau qhov electrode ob peb ntawm corrosion cell, stainless hlau substrate yog anode, uas Fe loses electrons nyob rau hauv cov tshuaj tiv thaiv electrode yuav tsum oxidized, thiab ces generates Fe2O3 kom oxidation cov tshuaj tiv thaiv uas lub substrate yaj thiab eroded. Qhov txheej yog lub cathode, thiab nws tau txais electrons los xyuas qhov txo cov tshuaj tiv thaiv, yog li qhov txheej yuav tsis raug puas los ntawm corrosion.

Nyob rau hauv no txoj kev, lub substrate uas nyob ze lub plating defects raws li hauv zos corrosion. Yog tias qhov corrosion loj heev, thiab cov khoom ua rau corrosion, cov txheej yuav raug puas tsuaj los ntawm kev txawb thiab rho tawm ntawm nws, los yog cov substrate yog etched thiab eroded, ua rau lub plating sab nrauv thiab crushing vim tsis muaj kev pab. Qhov no yog vim li cas vim li cas cov khoom xeb thaum ntsev dej tshuaj tua kab.