Kev kho deg yog txheej txheem uas txhim kho cov khoom nto ntawm cov hlau los ntawm ntau txoj kev. Cov no suav nrog kev tiv thaiv corrosion, txhim kho hnav tsis kam, thiab txhim kho qhov zoo nkauj. Tsis zoo li lwm cov txheej txheem ua, kev kho deg tsis hloov cov duab lossis qhov ntev ntawm ib feem; xwb, nws hloov nws cov yam ntxwv nto. Thaum kho qhov chaw tsim nyog tuaj yeem txuas ntxiv lub neej kev pab cuam ntawm cov khoom siv hlau, nws kuj nce nqi ntau lawm.
Hais txog kev xaiv cov khoom siv hlau, cov khoom sib txawv muaj cov yam ntxwv sib txawv. Piv txwv li, steel exhibits siab zog thiab hardness, ua rau nws haum rau daim ntaub ntawv uas hnyav loads; aluminium thiab nws cov alloys yog lub teeb yuag thiab muaj kev tiv thaiv corrosion zoo dua, txawm tias lawv lub zog qis dua; thiab tooj liab thiab nws cov alloys muaj cov khoom siv hluav taws xob zoo heev, ua rau lawv nquag siv hauv cov khoom siv hluav taws xob. Xaiv cov khoom tsim nyog yuav tsum muaj kev ntsuam xyuas dav dav ntawm qhov chaw ua haujlwm, kev xav tau ntawm kev ua haujlwm, thiab kev xav txog tus nqi.
