* Cov khoom siv yog ua los ntawm cov khoom siv hlau, thiab hlau yog nquag oxidation cov tshuaj tiv thaiv, uas ua rau corrosion;
* Muaj ntau yam impurities hauv cov hlau thiab nws yooj yim rau corroded;
* Qhov ntau qhov zoo ntawm cov khoom, qhov rougher ntawm qhov chaw thiab qhov ua rau corrosion tsis zoo;
* Qhov chaw ua haujlwm muaj qhov kub thiab txias siab, lossis muaj ntau cov pa oxygen thiab chloride ions nyob rau hauv ib puag ncig, thiab nws yog ib qho yooj yim kom muaj cov tshuaj tiv thaiv nrog lub tshuab ziab khaub ncaws, yog li ua kom nws cov qib corrosion.
