Kev txhuam hniav yog txheej txheem txheej txheej saum npoo uas cov txhuam txhuam siv los tsim cov khoom sib txawv ntawm qhov sib txawv roughness qhov tseem ceeb.Kev txhuam hniav tsim cov hlab ntsha hauv cov qauv unidirectional thiab ua kom tiav satin.Abrasive txhuam tuaj nyob rau hauv cov lej sib txawv xws li cov ntawv xuab zeb.Ntau dua tus lej grit, qhov zoo dua qhov chaw tsim los ntawm txhuam txhuam.

Kev txhuam ntawm cov khoom yuav tsum tau txhuam tshwj xeeb nyob ntawm qhov chaw roughness thiab corrosion kuj yuav tsum tau.Yog hais tias ib feem yuav tsum tau corrosion kuj, nws yuav tsum tau txhuam nrog ib tug txhuam txhuam ntawm tib yam khoom raws li nws tus kheej.Piv txwv li, ib qho hlau los yog txhuas feem yuav xav tau cov hlau los yog txhuas txhuam txhuam kom tiv thaiv corrosion.Feem ntau, thaum corrosion kuj yog thawj qhov yuav tsum tau txhuam hniav yog tsis pom zoo.